| 1. |
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| 2. |
- Albrektsson, Tomas, 1945, et al.
(författare)
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On crestal/marginal bone loss around dental implants.
- 2012
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Ingår i: The International journal of prosthodontics. - : Quintessence Publishing co inc. - 0893-2174 .- 1139-9791. ; 27:4, s. 736-738
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 3. |
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| 4. |
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| 5. |
- Bergman, B, et al.
(författare)
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An intraindividual clinical comparison of 2 metal-ceramic systems.
- 1999
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Ingår i: International Journal of Prosthodontics. - 0893-2174 .- 1139-9791. ; 12:5, s. 444-7
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: It has been questioned whether the surface and color of the ceramic and the metal-ceramic bond strength of a titanium-ceramic system are comparable to those of a conventional noble alloy-ceramic system. It was therefore the aim of this study to carry out an intraindividual clinical comparison between crowns fabricated according to the Procera system (titanium copings veneered with a low-fusing ceramic) and noble-alloy copings veneered with a medium-fusing ceramic. MATERIALS AND METHODS: Twenty-one crown pairs were fabricated for eighteen patients; three of the patients were each provided with two crown pairs. After 2 years nineteen crown pairs in sixteen patients could be compared. Clinical examinations were performed by two calibrated dentists who are long experienced in prosthetic dentistry. The crowns were rated according to the California Dental Association system. In addition, Bleeding Index and Margin Index were evaluated. RESULTS: After 2 years the quality of surface and color of the ceramic material seemed to have deteriorated more in titanium-ceramic crowns than in conventional metal-ceramic crowns, although the difference was not statistically significant. Regarding anatomic form, margin integrity, Bleeding Index, and Margin Index the differences between the two crown systems were small. CONCLUSION: The low-fusing ceramics have been subject to improvements during the last few years. Their bond strength to titanium seems to be comparable to that of conventional metal-ceramic systems. However, in the long run one problem may be the surface and color stability of low-fusing ceramics. To make extended long-term comparisons between the two metal-ceramic systems possible the present patient material will be followed for a longer period than the current 2 years.
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| 6. |
- Chrcanovic, Bruno, et al.
(författare)
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Bone Quality and Quantity and Dental Implant Failure: A Systematic Review and Meta-analysis
- 2017
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Ingår i: International Journal of Prosthodontics. - : Quintessence Publishing. - 0893-2174 .- 1942-4426 .- 1139-9791. ; 30:3, s. 219-237
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Forskningsöversikt (refereegranskat)abstract
- Purpose: The aim of this study was to test the null hypothesis that there is no difference in implant failure rates, marginal bone loss, and postoperative infection for implants inserted in bone with different qualities and quantities according to the classification of Lekholm and Zarb. Materials and Methods: An electronic search was undertaken in January 2015 for randomized and nonrandomized human clinical studies. Results: A total of 94 publications were included. When bone sites of different qualities were considered, the results suggested the following comparative implant failure rates: 1 > 2, 1 > 3, 3 > 2, 4 > 1, 4 > 2, and 4 > 3. Sensitivity analyses suggested that when implants inserted in bone qualities 1 and 2 and 1 and 3 were compared, oxidized and sandblasted/acid-etched surfaces showed a decrease in significant difference in failures compared with turned implants. The same is not true for failure of implants inserted in bone quality 4 compared to failure of implants in all other bone qualities. When bone sites of different quantities were considered, the following comparative implant failure rates were observed: A > B, A > C, A < D, B < C, B < D, C < D, E > A, E > B, E > C, E > D. Due to insufficient information, meta-analyses for the outcomes postoperative infection and marginal bone loss were not performed. Conclusion: Sites with poorer bone quality and lack of bone volume may statistically affect implant failure rates. Implant surfaces may play a role in failure of implants in different bone qualities.
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| 7. |
- Chrcanovic, Bruno, et al.
(författare)
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Impact of Different Surgeons on Dental Implant Failure
- 2017
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Ingår i: International Journal of Prosthodontics. - : Quintessence Publishing. - 0893-2174 .- 1139-9791. ; 30:5, s. 445-454
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: To assess the influence of several factors on the prevalence of dental implant failure, with special consideration of the placement of implants by different dental surgeons. Materials and Methods: This retrospective study is based on 2,670 patients who received 10,096 implants at one specialist clinic. Only the data of patients and implants treated by surgeons who had inserted a minimum of 200 implants at the clinic were included. Kaplan-Meier curves were stratified with respect to the individual surgeon. A generalized estimating equation (GEE) method was used to account for the fact that repeated observations (several implants) were placed in a single patient. The factors bone quantity, bone quality, implant location, implant surface, and implant system were analyzed with descriptive statistics separately for each individual surgeon. Results: A total of 10 surgeons were eligible. The differences between the survival curves of each individual were statistically significant. The multivariate GEE model showed the following variables to be statistically significant: surgeon, bruxism, intake of antidepressants, location, implant length, and implant system. The surgeon with the highest absolute number of failures was also the one who inserted the most implants in sites of poor bone and used turned implants in most cases, whereas the surgeon with the lowest absolute number of failures used mainly modern implants. Separate survival analyses of turned and modern implants stratified for the individual surgeon showed statistically significant differences in cumulative survival. Conclusion: Different levels of failure incidence could be observed between the surgeons, occasionally reaching significant levels. Although a direct causal relationship could not be ascertained, the results of the present study suggest that the surgeons' technique, skills, and/or judgment may negatively influence implant survival rates.
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| 8. |
- Collin Bagewitz, Ingrid, et al.
(författare)
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Oral prostheses and oral health-related quality of life : a survey study of an adult Swedish population
- 2007
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Ingår i: International Journal of Prosthodontics. - 0893-2174 .- 1139-9791. ; 20:2, s. 132-142
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: The purpose of the study was to investigate whether oral health-related quality of life (OHRQOL) in an adult Swedish population could be explained by social attributes; individual attributes; dental status, with a special focus on the role of prosthodontics; and dental care attitudes. MATERIALS AND METHODS: The study was based on responses to a questionnaire sent in 1998 to a random sample of 1,974 persons aged 50 to 75 years (66% response rate). Three factors representing various aspects of OHRQOL were set as dependent variables in multiple-regression models: oral health impact on everyday activities, oral health impact on the psychologic dimension, and oral health impact on oral function. Independent variables in the models were social attributes, individual attributes, number of teeth, denture (ie, type of denture, if present), and dental care attitudes. RESULTS: General health in relation to age peers had the strongest association with all 3 dependent variables, followed by number of teeth and need care--cost barrier. When number of teeth was excluded, removable denture was found to covary with the dependent variables in each of the 3 regression models. CONCLUSION: The number of remaining teeth is more important than the type of denture in explaining OHRQOL. It is less important that a denture is fixed for those with few remaining teeth, in contrast to all others. Explanations are also found in general health and various aspects of dental care costs.
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| 9. |
- Dahlmo, K I, et al.
(författare)
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On a new method to assess the accuracy of a CAD program.
- 2001
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Ingår i: International Journal of Prosthodontics. - : Quintessence Publishing. - 0893-2174 .- 1139-9791. ; 14:3, s. 276-83
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: This study was initiated with the purpose of developing and evaluating a system for measuring the magnitude of the variation between a computer-aided design (CAD) object created on the computer screen and a replicated object produced by computer-aided manufacturing (CAM). MATERIALS AND METHODS: Controlled geometric forms, a square and a cone, were designed in a CAD program, and measuring distances were selected. The CAD data were transmitted to CAM data, and objects were produced. The CAD/CAM process was the Procera system, and the holder system permitted the objects to be ground into cross sections, similar to the visualization in the CAD program. Five objects of each shape were produced and measured by two operators two times. Three operators measured one of the objects 30 times. RESULTS: Observed values were greater than the true value. For all objects, the systematic error was at most 15.5 microns. Interoperator difference was small. The variation because of measurement error was greater for the square object compared to the cone. However, the variation because of object was higher for the cone object than for the square. The total standard deviation was 7.7 microns. Thus, the total random error caused by object variation and measurement error was in approximately 95% of all measurements less than 15 microns. CONCLUSION: There are no differences in the measurement data derived from this method and actual measurement data from an object created by the computer-aided dental design program. The method has high validity and reliability, i.e., high accuracy.
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| 10. |
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| 11. |
- Ekberg, EwaCarin, et al.
(författare)
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A 6- and 12-month follow-up of appliance therapy in TMD patients : a follow-up of a controlled trial
- 2002
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Ingår i: International Journal of Prosthodontics. - 0893-2174 .- 1139-9791. ; 15:6, s. 564-570
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: This study compared the long-term effects of treatment with a stabilization appliance and treatment with a control appliance in patients with temporomandibular disorders (TMD). MATERIALS AND METHODS: In a controlled trial, 60 TMD patients with tem-poromandibular joint (TMJ) pain were evaluated after 10 weeks of treatment with either a stabilization appliance or a control appliance. At the 10-week follow-up, the 60 patients were assigned to one of three groups according to their demand for treatment. Group T, the treatment group, comprised 30 patients treated with a stabilization appliance; group C, the control group, comprised nine patients treated with a control appliance; and group M, the mixed treatment group, comprised 21 patients treated with first a control appliance and then a stabilization appliance. Signs and symptoms were evaluated in all three groups at 6- and 12-month follow-ups. RESULTS: At the 6- and 12-month follow-ups, a significant reduction in TMJ pain as measured on a visual analogue scale was found in all three groups, and a significant decrease in signs and symptoms was found in groups T and M. CONCLUSION: After 6 and 12 months of use, the stabilization appli-ance was found to still be effective in the alleviation of signs and symptoms in patients with TMD. Many patients in group C changed to a stabilization appliance at the 1 0-week follow-up, which significantly reduced the number of patients in this group. Most patients reported positive change in overall subjective symptoms in this trial. The stabilization appliance can therefore be recommended for patients with TMD.
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| 12. |
- Eliasson, Alf, 1959, et al.
(författare)
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A 5-year prospective clinical study of submerged and nonsubmerged Paragon system implants in the edentulous mandible.
- 2010
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Ingår i: The International journal of prosthodontics. - : Quintessence. - 0893-2174 .- 1139-9791. ; 23:3, s. 231-8
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Forskningsöversikt (refereegranskat)abstract
- PURPOSE: The aim of this investigation was to evaluate the clinical outcome of two different surgical protocols in the edentulous mandible: submerged and nonsubmerged. Further, the Paragon dental implant with a titanium plasma-sprayed surface was evaluated. MATERIALS AND METHODS: Twenty-nine consecutively treated patients with 168 implants supporting fixed prostheses were included. All but 3 patients were provided 6 implants, placed via nonsubmerged healing on one side and submerged healing on the other. Data were collected from patient records and radiographs. Twenty-four patients participated in the 5-year clinical follow-up examination. RESULTS: After 5 years, all patients still had their mandibular fixed prostheses in function. Cumulative survival rates were 100% for prostheses and 99.4% for implants. However, 3 implants fractured in 1 patient. One submerged implant was lost before loading but no further implants were lost during follow-up. The radiographic bone loss was small for all implants with a mean of 0.14 mm (standard deviation [SD]: 0.37) at 1 year and 0.42 mm (SD: 0.48) at 5 years for nonsubmerged implants and 0.17 mm (SD: 0.32) at 1 year and 0.51 mm (SD: 0.33) at 5 years for submerged implants. Nineteen implants (including the 3 that fractured) presented annual bone loss exceeding 0.2 mm after the first year, yielding a cumulative success rate of 86.2% after 5 years. CONCLUSION: Single-stage surgery was shown to have the same predictability as two-stage surgery in the anterior edentulous mandible. Paragon implants with a titanium plasma-sprayed surface showed a fracture rate of 2.2% and a success rate of 86.2% after 5 years.
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| 13. |
- Falk, Anders, et al.
(författare)
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Reliability of the impression replica technique
- 2015
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Ingår i: International Journal of Prosthodontics. - : Quintessence. - 0893-2174 .- 1139-9791. ; 28:2, s. 179-180
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to evaluate the reliability of the impression replica technique with a four-unit zirconia fixed dental prosthesis (FOP). Marginal and internal fit were measured by repeatedly placing the FDP on an epoxy cast using light-body silicone material corresponding to cement. All measured marginal and internal fit points showed varying values. The greatest variations were seen at the most distal margin (33 mu m) and at the distal abutment of the FDP (77 mu m). The results showed that the technique gives moderate variations and is a useful method to evaluate marginal and internal fit.
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| 14. |
- Falk, Anders, et al.
(författare)
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Reliability of the Impression Replica Technique
- 2015
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Ingår i: International Journal of Prosthodontics. - 0893-2174 .- 1139-9791. ; 28:2, s. 179-180
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to evaluate the reliability of the impression replica technique with a four-unit zirconia fixed dental prosthesis (FOP). Marginal and internal fit were measured by repeatedly placing the FDP on an epoxy cast using light-body silicone material corresponding to cement. All measured marginal and internal fit points showed varying values. The greatest variations were seen at the most distal margin (33 mu m) and at the distal abutment of the FDP (77 mu m). The results showed that the technique gives moderate variations and is a useful method to evaluate marginal and internal fit.
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| 15. |
- Franco Tabares, Sebastian, et al.
(författare)
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Limited Effect of Cement Material on Stress Distribution of a Monolithic Translucent Zirconia Crown: A Three-Dimensional Finite Element Analysis.
- 2018
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Ingår i: The International journal of prosthodontics. - : Quintessence Publishing. - 0893-2174 .- 1139-9791. ; 31:1, s. 67-70
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Tidskriftsartikel (refereegranskat)abstract
- The literature shows that the performance of densely sintered zirconia single crowns seems to be unaffected by the cement material. The purpose of this study was to evaluate the effects of various cement materials on the stress distribution in a monolithic translucent zirconia crown.A crown-cement-dentin complex was modeled. Six cements were evaluated: zinc phosphate, glass-ionomer, resin-modified glass-ionomer, dual-cure resin, calcium aluminate-based, and a theoretical or conceptual cement with mechanical properties close to those of dentin (ie, monoblock cement).While varying stress concentrations were found within the cements, the stress concentrations in the crown and dentin were consistent irrespective of cement material.Within the limitations of this study, it can be concluded that cement material had a negligible effect on stress distribution in the monolithic zirconia crown.
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| 16. |
- Gardell, Emma, et al.
(författare)
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Translucent Zirconium Dioxide and Lithium Disilicate : A 3-Year Follow-up of a Prospective, Practice-Based Randomized Controlled Trial on Posterior Monolithic Crowns
- 2021
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Ingår i: International Journal of Prosthodontics. - : Quintessence. - 0893-2174 .- 1139-9791. ; 34:2, s. 163-
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: To systematically evaluate and compare the clinical performance of lithium disilicate (LDS)and zirconium dioxide (ZrO2)-based ceramic monolithic crowns in the posterior dentition. Materials and Methods: Treatment was administered by two experienced general dental practitioners in two public dental health care clinics. Forty-four patients received 60 crowns randomized to be either LDS or ZrO2 and cemented with resin cement. Evaluations were performed after 3 years using California Dental Association criteria. Results: The mean follow-up time was 40 months (range: 31 to 50). No crown fractured during the observation time, and no chip-off fractures occurred. The success rate for ZrO2 was 80%, and the survival rate was 93.3%. For LDS, the success rate was 89.7%, and the survival rate was 100%. Survival after 3 years for all crowns together was 96.6%, and success was 84.7%. There was no significant difference between the two materials. Conclusion: Crowns made of monolithic translucent ZrO2 and LDS show equal and promising clinical results from a short-term perspective. There seems to be a difference between how patients and professionals rate crowns concerning esthetics (color and shape), with patients rating the restorations more favorably.
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| 17. |
- Ghiasi, Peyman, et al.
(författare)
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Implant and Prosthesis Failure Rates with Implant-Supported Maxillary Overdentures : A Systematic Review
- 2021
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Ingår i: International Journal of Prosthodontics. - : Quintessence. - 0893-2174 .- 1139-9791. ; 34:4, s. 482-491k
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: To assess the clinical outcomes of maxillary overdentures supported by dental implants by conducting a literature review. Materials and Methods: An electronic search was undertaken in March 2019. Eligibility criteria included publications reporting cases of implant-supported maxillary overdentures with follow-up information. Results: A total of 131 publications were included (1,478 overdentures supported by 6,681 implants). The mean number of attachments per overdenture was 3.8 ± 1.2 (range: 1 to 9), and a bar-clip system was used in about half of the cases. The prostheses were followed up for a mean of 47.9 ± 32.8 (range: 1 to 240) months. A total of 401 implants (6.0%) failed in 219 patients (14.8%), and 55 prostheses (3.7%) failed at a mean of 40.2 ± 53.2 (range: 6 to 240) months after placement. Most of the failures happened within the first year after placement for both implants (52.1%) and prostheses (41.8%). Patients with fewer implants per prosthesis presented higher prosthesis failure rates than patients with more implants per prosthesis. The cumulative survival rate for dental implants after 19 years was 70.4%, and for implant-supported maxillary overdentures was 79.8%. Presence of palatal coverage and/or metallic structure/reinforcement does not seem to have an influence on failure rate. Of the most commonly used attachment systems, the ball/O-ring and the Ceka were the ones with the highest rates of patients having at least one implant failure. Conclusion: Most of the prosthesis failures were due to loss of implants, and the first year was the most critical period for failures. The number of dental implants placed per patient seemed to have an impact on the occurrence of overdenture failure.
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| 18. |
- Gjelvold, Björn, et al.
(författare)
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Angled Screw Channel : An Alternative to Cemented Single-Implant Restorations-Three Clinical Examples
- 2016
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Ingår i: International Journal of Prosthodontics. - : Quintessence. - 0893-2174 .- 1139-9791. ; 29:1, s. 74-76
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Tidskriftsartikel (refereegranskat)abstract
- This article presents three cases of single labially tilted implants restored with screw-retained single crowns. Individualized abutments with an angled screw channel were used to avoid an unesthetic vestibular access channel. This individualized abutment allows the dentist and dental technician to use the screw-retained restorations where a cemented reconstruction would otherwise have been needed.
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| 19. |
- Gjelvold, Björn, et al.
(författare)
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Immediate Loading of Single Implants, Guided Surgery, and Intraoral Scanning: A Nonrandomized Study
- 2020
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Ingår i: International Journal of Prosthodontics. - : Quintessence Publishing. - 0893-2174 .- 1139-9791. ; 33:5, s. 513-522
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: To compare clinical and esthetic outcomes between immediately loaded single implants placed with and without a fully guided surgical procedure. Materials and Methods: Patients with a missing maxillary tooth (second premolar to second premolar) were considered for inclusion in this 1-year prospective nonrandomized study. Exclusion criteria were general health contraindications for oral surgery besides the need for bone grafting or ridge augmentation. One group received digital implant planning, fully guided surgery, and immediate loading (DIL). The other group received freehand surgery and immediate loading (IL). Outcome measures were implant survival, marginal bone loss, soft tissue changes, papilla index, pink and white esthetic scores (PES and WES, respectively), and patient-reported outcome measures (PROMs). Results: Two of 21 implants failed in the DIL group soon after placement, resulting in a 1-year implant survival rate of 90.5%, while no implants failed in the IL group. Significantly higher papilla index scores and lower soft tissue changes were found for the DIL group compared to the IL group. No differences were found after 1 year regarding marginal bone loss, PES, WES, or PROMs. Conclusion: Within the limitations of this study, immediate loading in combination with fully guided surgery might negatively affect implant survival. Immediate loading, fully guided surgery, and a digital workflow appear to have a positive effect on early soft tissue adaptation.
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| 20. |
- Gonda, Tomoya, et al.
(författare)
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Predictors of multiple tooth loss among socioculturally diverse elderly subjects
- 2013
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Ingår i: International Journal of Prosthodontics. - 0893-2174 .- 1139-9791. ; 26:2, s. 127-134
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: This study identifies clinical factors that predict multiple tooth loss in a socioculturally diverse population of older adults.Materials and Methods: A total of 193 participants from English-, Chinese-, or Punjabi-speaking communities in Vancouver, British Columbia, with low incomes and irregular use of dental services were followed for 5 years as part of a clinical trial of a 0.12% chlorhexidine mouthrinse. The participants were interviewed and examined clinically, including panoramic radiographs, at baseline and annually for 5 years. Binary logistic regression was used to test the hypothesis that there was no difference between incidence of multiple (≥ 3) tooth loss in older people with various biologic, behavioral, prosthodontic, and cultural variables over 5 years.Results: Multiple tooth loss, which was distributed similarly among the groups in the trial, occurred in 39 (20%) participants over 5 years. The use of removable prostheses was the best predictor of loss, followed by the number of carious surfaces and number of sites with gingival attachment loss > 6 mm. The pattern of prediction was consistent across the three linguocultural groups.Conclusion: The use of removable dentures was the dominant predictor of multiple tooth loss in the three communities, but that tooth loss was not significantly associated with the cultural heritage of the participants.
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| 21. |
- Gonda, Tomoya, et al.
(författare)
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Predictors of multiple tooth loss among socioculturally diverse elderly subjects
- 2013
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Ingår i: International Journal of Prosthodontics. - : Quintessence Publishing Company. - 0893-2174 .- 1139-9791. ; 26:2, s. 127-134
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: This study identifies clinical factors that predict multiple tooth loss in a socioculturally diverse population of older adults. Materials and Methods: A total of 193 participants from English-, Chinese-, or Punjabi-speaking communities in Vancouver, British Columbia, with low incomes and irregular use of dental services were followed for 5 years as part of a clinical trial of a 0.12% chlorhexidine mouthrinse. The participants were interviewed and examined clinically, including panoramic radiographs, at baseline and annually for 5 years. Binary logistic regression was used to test the hypothesis that there was no difference between incidence of multiple (≥ 3) tooth loss in older people with various biologic, behavioral, prosthodontic, and cultural variables over 5 years. Results: Multiple tooth loss, which was distributed similarly among the groups in the trial, occurred in 39 (20%) participants over 5 years. The use of removable prostheses was the best predictor of loss, followed by the number of carious surfaces and number of sites with gingival attachment loss > 6 mm. The pattern of prediction was consistent across the three linguocultural groups. Conclusion: The use of removable dentures was the dominant predictor of multiple tooth loss in the three communities, but that tooth loss was not significantly associated with the cultural heritage of the participants.
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| 22. |
- Gunne, Johan, et al.
(författare)
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Bone grafts and implants in the treatment of the severely resorbed maxillae : a 3-year follow-up of the prosthetic restoration.
- 1995
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Ingår i: International Journal of Prosthodontics. - 0893-2174 .- 1139-9791. ; 8:1, s. 38-45
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Tidskriftsartikel (refereegranskat)abstract
- Thirty patients with severely resorbed maxillae were treated in a one-stage procedure using bone graft and implant placement. A horseshoe-shaped bone graft was taken from the iliac wing and fixed to the residual maxillary ridge using titanium implants, which supported the prostheses placed after a 6-month healing period. The material constituted two groups: a development group, the first 10 patients; and a routine group, the following 20 patients. At the 3-year follow-up, the implant survival was 87.5% and the prosthesis stability was 100% in the routine group. The probing depth did not change during the follow-up period, while the grafted region decreased in volume during the first postoperative year. The patients reported improved chewing ability and improved life quality. Very few technical and prosthodontic complications occurred.
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| 23. |
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| 24. |
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| 25. |
- Helldén, Leif, et al.
(författare)
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A prospective 5-year multicenter study of the Cresco implantology concept
- 2003
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Ingår i: International Journal of Prosthodontics. - 0893-2174 .- 1139-9791. ; 16:5, s. 554-562
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- PURPOSE: The purpose of this study was to investigate the clinical and radiographic outcome of a prospective 5-year longitudinal multicenter test of a simplified implantology concept comprising an abut-ment-free implant system (Cresco) and a new method for fabrication of passively fitting superstructures, the Cresco Ti Precision method. MATERIALS AND METHODS: The tests were carried out at three different centers. Sixty partially or completely edentulous patients were restored by fixed implant-supported superstructures fabricated according to the Cresco Ti Precision method. In all, 215 Cresco implants were placed for the support of the superstructures. For various reasons, eight patients (13%) could not be followed through the 5 years. The radiographic measurements were recorded from radiographs exposed perpendicular to the implants. RESULTS: The initial implant failure rate (during the healing phase) was 2%, and the survival rate after loading was 98%. The mean peri-implant bone loss was 0.29 mm (SD 0.57). Of the measured sites, 71% showed a crestal bone loss of less than 0.5 mm. Very few mechanical complications were observed. This was attributed to the passively fitting superstructures. CONCLUSION: The results from the present multicenter test demonstrated that the abutment-free Cresco implantology concept is a reliable alternative method for implant-supported fixed prosthetic rehabilitation of edentulous and partially edentulous jaws.
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| 26. |
- Hjalmarsson, Lars, et al.
(författare)
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Implant-Level Prostheses in the Edentulous Maxilla : A Comparison with Conventional Abutment-Level Prostheses After 5 Years of Use
- 2011
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Ingår i: International Journal of Prosthodontics. - : Quintessence Publishing Co. - 0893-2174 .- 1139-9791. ; 24:2, s. 158-167
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: Long-term comparisons of frameworks at the implant or abutment level are not available, and knowledge of the clinical function of cobalt-chromium (Co-Cr) alloy frameworks is limited. Primarily, the aim of this study was to compare the 5-year clinical performance of frameworks with or without abutment connections to implants. Secondly, the outcomes of prostheses made from Co-Cr alloy with porcelain veneers to those made of commercially pure titanium (CP Ti) with acrylic veneers were compared.Materials and Methods: The test groups comprised patients treated with screw-retained fixed prostheses made at the implant level according to the Cresco method in either dental porcelain–veneered Co-Cr alloy (n = 15) or acrylic-veneered CP Ti (n = 25). A control group of 40 randomly selected patients were provided with prostheses made at the standard abutment level in CP Ti with acrylic veneers. For all patients, clinical and radiologic 5-year data were retrospectively collected and evaluated.Results: Five-year implant cumulative survival rates (CSRs) were 98.6% and 97.6% for test and control groups, respectively (P > .05). No major differences in bone level were demonstrated between the groups after 5 years (P > .05). Significantly more complications occurred in the test groups compared to the control group (P < .01), with the most common complications being mucositis and fracture of veneers.Conclusions: After 5 years, the clinical outcomes of implant-level prostheses made of porcelain-veneered Co-Cr or acrylic-veneered CP Ti seem comparable to acrylic-veneered titanium prostheses made at the standard abutment level regarding implant CSR and bone levels. However, more complications were registered in implant-level prostheses compared to the standard abutment-level prostheses.
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| 27. |
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| 28. |
- Hultin, M., et al.
(författare)
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Oral Rehabilitation of Tooth Loss: A Systematic Review of Quantitative Studies of OHRQoL
- 2012
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Ingår i: International Journal of Prosthodontics. - : Quintessence. - 0893-2174 .- 1139-9791. ; 25:6, s. 543-552
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: This study aimed to review published quantitative studies for evidence regarding the influence of oral rehabilitation following total or partial tooth loss on self-perceived oral health-related quality of life (OHRQoL). Materials and Methods: Three databases were searched using specified indexing terms. The reference lists of relevant publications were also searched manually. Quality of evidence was classified according to GRADE guidelines as high, moderate, low, or very low. Results: The search yielded 2,138 titles and abstracts, 2,102 of which were of a quantitative study design. Based on pre-established criteria, the full-text versions of 322 articles were obtained. After data extraction and interpretation, 5 publications of high or moderate study quality remained. The results of these 5 studies showed positive effects of oral rehabilitation on OHRQoL. Two studies showed substantial improvements. Conclusions: This is a relatively new field of research; there are very few quantitative studies of how patients perceive OHRQoL following tooth loss and subsequent rehabilitation. While this review indicates that treatment has positive effects on quality of life, the scientific basis is insufficient to support general conclusions about the influence of various interventions on the OHRQoL of patients who have experienced total or partial tooth loss. To achieve a more comprehensive analysis, it is recommended that future studies be based on a combination of quantitative and qualitative methods, ie, questionnaires and semi-structured interviews. The follow-up period must also be appropriate for the specific intervention studied.
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| 29. |
- Janda, Martin, et al.
(författare)
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Influence of Misfit on the Occurrence of Veneering Porcelain Fractures in Implant-Supported Metal-Ceramic Fixed Dental Prostheses : A Finite Element Analysis Replication of In Vitro Results
- 2021
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Ingår i: International Journal of Prosthodontics. - : Quintessence. - 0893-2174 .- 1139-9791. ; 34:4, s. 458-462
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: To investigate the impact of different extents of misfit between a restoration and the supporting implant on veneer fractures in screw-retained implant-supported metal-ceramic fixed dental prostheses (FDPs). Materials and Methods: A finite element analysis (FEA) model of a five-unit screw-retained metal- ceramic FDP supported by three implants was constructed, replicating a previous in vitro study. Eight different gap configurations at the single terminal implant, ranging from 0 to 150 μm, were tested. All setups were tested after clamping and with a load of 200 N applied. Maximum stress within the FDP was calculated. Results: The stress increased with each increase in misfit size above 30 μm, with the relationship between gap size and stress being linear up to 100-μm misfit. Above 100 μm, the stress increase accelerated. The stress pattern within the FDP changed with increasing gap size, confirming the findings of a previously conducted in vitro experiment for a misfit of 150 μm. Conclusion: The results of the FEA were in agreement with in vitro observations, validating the predictive value of FEA for technical complications. A misfit between an FDP and a supporting implant implies an increased risk of veneer fracture. Above a misfit of 30 μm, the stress levels are likely to be high enough to cause veneer fracture, and the risk increases disproportionately for misfit above 100 μm.
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| 30. |
- Korduner, Eva-Karin, et al.
(författare)
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Attitudes toward the shortened dental arch concept among Swedish general dental practitioners
- 2006
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Ingår i: International Journal of Prosthodontics. - : Quintessence. - 0893-2174 .- 1139-9791. ; 19:2, s. 171-176
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: The purpose of this investigation was to obtain the opinions and assess the attitudes of Swedish general dental practitioners in private practice versus a public health care setting regarding management of patients with a shortened dental arch (SDA). MATERIALS AND METHODS: A questionnaire containing different statements regarding the SDA concept was sent to a random sample of 189 clinicians. Differences between male and female practitioners and between private practitioners (PPs) and those employed by the Public Dental Health Service (PDHS) were tested for statistical significance by the Student t test. RESULTS: The response rate was 54% (102 clinicians). Among the respondents, 62% were men and 38% were women. Fifty-six percent were PPs and 44% were employed by the PDHS. The results showed small differences in attitudes between various groups of practitioners but large individual variations. In general, Swedish general practitioners had a positive attitude toward the SDA concept with respect to oral function and oral comfort. They recognized few risks with a dentition lacking molar support, although female clinicians were more risk conscious. PPs expressed fewer advantages in using the SDA concept than PDHS practitioners with respect to the reduced risk for overtreatment, better patient economy, and the ability for older patients to keep their teeth. CONCLUSION: The results from this questionnaire study indicate that, overall, Swedish general practitioners have an affirmative opinion toward the SDA concept.
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| 31. |
- Lantto, Angelika, et al.
(författare)
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Oral status and prosthetic treatment needs in functionally impaired and elderly individuals
- 2018
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Ingår i: International Journal of Prosthodontics. - : Quintessence Publishing. - 0893-2174 .- 1139-9791. ; 31:5, s. 494-501
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: The purpose of this cross-sectional study was to describe the oral status and prosthetic treatment needs of dependent, functionally impaired individuals and dependent elderly individuals in comparison with the general population. Materials andMethods: A total of 355 subjects, sampled from the register of increased financial support for dependent and functionally impaired individuals in the north of Sweden, were examined. The variables were number of teeth, Eichner Index, type and condition of prostheses, and treatment needs. Statistical analyses were carried out using an independent samples t test for means and chi-square tests for proportions. Comparisons were made with the results of an earlier study (EPI-Norr) of 908 patients from the general population in the same county.Results: The study group had fewer teeth compared with the general population (20% edentulous in the study group vs 7% in the general population; P < .001), as well as more dentures and fewer tooth- and implant-supported prostheses. A total of 42% of the dentures in the maxilla and 51% of the dentures in the mandible were in poor condition. There was no difference in complications from dental implants between the groups.Conclusion: The results of this study suggest that since the Swedish system for financial support enables dental care to the patient groups in question, the situation is probably better in Sweden than in many other countries. As more accentuated differences can be assumed between these population groups in other countries, these findings are also interesting from an international perspective.
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| 32. |
- Lantto, Angelika, et al.
(författare)
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Tooth loss and prosthetic treatment in dependent and functionally impaired individuals with respect to age and gender
- 2016
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Ingår i: International Journal of Prosthodontics. - : Quintessence Publishing. - 0893-2174 .- 1139-9791. ; 29:1, s. 68-70
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: The aim of this study was to compare the prevalence of tooth loss and prosthetic treatments in dependent, functionally impaired individuals with the general population.Materials and Methods: Data collected from 250 subjects from a register covering dependent and functionally impaired individuals in Sweden were compared with data from matched controls. The collected variables included number of teeth, tooth loss, and prosthetic treatments in the different jaw regions.Results: The study group had a lower mean number of teeth and a higher proportion of complete tooth loss than the control group. Dentures were more common in the study group, and fixed prostheses, including dental implants, were more common in the control group. Gender-based differences related to tooth loss were also apparent.Conclusion: In spite of a well-organized recall system for dental care, differences still existed in tooth loss. The differences were more apparent in older individuals and appeared to be related to general health, functional impairments, and gender. Prosthetic treatment options were unevenly used and only one implant overdenture was found.
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| 33. |
- Larsson, Christel, et al.
(författare)
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A prospective study of implant-supported full-arch yttria-stabilized tetragonal zirconia polycrystal mandibular fixed dental prostheses : three-year results
- 2010
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Ingår i: International Journal of Prosthodontics. - : Quintessence. - 0893-2174 .- 1139-9791. ; 23:4, s. 364-369
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: The development of high-strength oxide ceramic materials has led to increased interest in all-ceramic fixed dental prostheses (FDPs). Success rates reported in clinical studies for all-ceramic FDPs based on high-strength oxide ceramic materials reportedly approach those of porcelain-fused-to-metal FDPs. These reconstructions, however, are still of limited size and have mainly concerned FDPs supported by natural teeth. The purpose of this study was to evaluate the clinical performance of multiunit all-ceramic FDPs supported by dental implants. MATERIALS AND METHODS: Ten patients received mandibular yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) FDPs manufactured according to the Cercon technique and supported by four Astra Tech implants. Nine patients received 10-unit FDPs and one patient received a 9-unit FDP. The FDPs were cemented with Panavia F 2.0 onto individually prepared titanium abutments. The FDPs were evaluated at baseline and after 12, 24, and 36 months. RESULTS: At the 3-year follow-up, all FDPs were in use, and all patients were fully satisfied with their treatment. None of the reconstructions had fractured. Superficial chip-off fractures of the veneering porcelain were, however, observed in nine patients (34 of 99 units, 34%). CONCLUSION: Results from this 3-year study suggest that implant-supported full-arch Y-TZP FDPs manufactured according to the Cercon technique should be viewed as a treatment alternative cautiously. A better understanding of the factors resulting in chip-off fractures is needed, together with longer follow-up studies involving larger numbers of patients, before the material and technique can be recommended for general use.
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| 34. |
- Larsson, Christel, et al.
(författare)
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Five-year follow-up of implant-supported Y-TZP and ZTA fixed dental prostheses. A randomized, prospective clinical trial comparing two different material systems
- 2010
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Ingår i: International Journal of Prosthodontics. - : Quintessence. - 0893-2174 .- 1139-9791. ; 23:6, s. 555-561
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: The aim of this study was to evaluate the clinical performance of two- to five-unit implant-supported all-ceramic restorations and to compare the results of two different all-ceramic systems, Denzir (DZ) and In-Ceram Zirconia (InZ). MATERIALS AND METHODS: Eighteen patients were treated with a total of 25 two- to five-unit implant-supported fixed dental prostheses. Nine patients were given DZ system restorations and 9 were given InZ system restorations. The restorations were cemented with zinc phosphate cement onto customized titanium abutments and were evaluated after 1, 3, and 5 years. RESULTS: At the 5-year follow-up, all restorations were in function; none had fractured. However, superficial cohesive (chip-off) fractures were observed in 9 of 18 patients (11 of 25 restorations). Sixteen units in the DZ group (9 of 13 restorations) and 3 in the InZ group (2 of 12 restorations) had chip-off fractures. The difference between the two groups regarding frequency of chip-off fractures was statistically significant (P < .05 at the FDP level and P < .001 at the unit level). CONCLUSION: The results suggest that all-ceramic implant-supported fixed dental prostheses of two to five units may be considered a treatment alternative. The DZ system, however, exhibited an unacceptable amount of veneering porcelain fractures and thus cannot be recommended for the type of treatment evaluated in this trial. Poor compatibility or problems with the bond mechanisms between the veneer and framework could not explain the chip-off fractures. Stress distribution, as well as other factors concerning the veneering porcelain, need to be evaluated further.
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| 35. |
- Larsson, Christel, et al.
(författare)
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Ten-Year Follow-Up of Implant-Supported All-Ceramic Fixed Dental Prostheses : A Randomized, Prospective Clinical Trial
- 2016
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Ingår i: International Journal of Prosthodontics. - : Quintessence. - 0893-2174 .- 1139-9791. ; 29:1, s. 31-34
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: The aim of this study was to evaluate the long-term clinical performance of and patient satisfaction with implant-supported all-ceramic fixed dental prostheses (FDPs) and to compare two different all-ceramic systems, Denzir (DZ) and In-Ceram Zirconia (InZ). MATERIALS AND METHODS: A total of 18 patients received 25 partial FDPs; 13 DZ, and 12 InZ. RESULTS: Of these patients, 17 attended the 10-year follow-up. None of the restorations had fractured. Fractures of the veneering porcelain were observed in nine patients; two from the InZ group and seven from the DZ group. All FDPs were in use, and all patients were fully satisfied with the treatment. CONCLUSION: Results from this long-term follow-up suggest that implant-supported all-ceramic FDPs are an acceptable treatment alternative.
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| 36. |
- Larsson, Christel, et al.
(författare)
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The clinical success of zirconia-based crowns : a systematic review
- 2014
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Ingår i: International Journal of Prosthodontics. - : Quintessence. - 0893-2174 .- 1139-9791. ; 27:1, s. 33-43
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Forskningsöversikt (refereegranskat)abstract
- Purpose: This Review aimed to evaluate the documented clinical success of zirconia-based crowns in clinical trials. Materials and Methods: Electronic databases were searched for original studies reporting on the clinical performance of tooth- or implant-supported zirconia-based crowns including PubMed, Cochrane Library and Science Direct. The electronic search was complemented by manual searches of the bibliographies of all retrieved full text articles and reviews as well as hand search of the following journals: International Journal of Prosthodontics, Journal of Oral Rehabilitation, International Journal of Oral & Maxillofacial Implants and Clinical Oral Implants Research. Results: The search yielded 3,216 titles. Based on pre-established criteria, 42 full-text articles were obtained. While 16 studies fulfilled the inclusion and exclusion criteria, only 3 randomized controlled trials were reported. Seven studies reported on tooth-supported and four on implant-supported crowns, and 5 studies reported on both types of support. Ten studies on tooth-supported and 7 on implant-supported crowns provided sufficient material for statistical analysis. Life table analysis revealed cumulative 5-year survival rates of 95,9% for tooth-supported and 97,1% for implant-supported crowns respectively. For implant-supported crowns the most common reasons for failure were technical (veneering material fractures). For tooth-supported crowns technical (veneering material fractures, loss of retention) and biological (endodontic/periodontic) reasons for failure were equally common. The most common complications for implant-supported crowns were veneering material fractures and bleeding on probing. For tooth-supported crowns the most common complications were loss of retention, endodontic treatment, veneering material fractures, and bleeding on probing. Conclusion: The results suggest that the success rate of tooth-supported and implant-supported zirconia-based crowns is adequate, similar, and comparable to that of conventional porcelain-fused-to-metal crowns. These results are, however, based on a relatively few studies, many that are not controlled clinical trials. Well-designed studies with large patient groups and long follow-up times are needed before general recommendations for the use of zirconia-based restorations can be provided.
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| 37. |
- Larsson, Pernilla, et al.
(författare)
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Development of an Orofacial Esthetic Scale in Prosthodontic Patients
- 2010
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Ingår i: International Journal of Prosthodontics. - : Quintessence Publishing Co Ltd. - 0893-2174 .- 1139-9791. ; 23:3, s. 249-256
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: Despite the interest and need to assess orofacial esthetics in prosthodontic patients, few self-reporting instruments are available to measure this construct, and none describe how prosthodontic patients perceive the appearance of their face, mouth, teeth, and dentures. The development of the Orofacial Esthetic Scale (DES) is reported in this article, in particular its conceptual framework, how questionnaire items were generated, and the scales measurement model. Materials and Methods: After test conceptualization, the authors solicited esthetic concerns from 17 prosthodontic patients by asking them to evaluate their own photographs. A focus group of 8 dental professionals reduced the initial number of concerns/items and decided on an item response format. Pilot testing in 9 subjects generated the final instrument, the DES. Exploratory factor analysis was performed to investigate DES dimensionality and item analysis to investigate item difficulty and discrimination in 119 subjects. Results: Prosthodontic patients generated an initial 28 esthetic concerns. These items were reduced to 8 preliminary representative items that were subsequently confirmed during pilot testing. Analysis supported 8 items assessing appearance: face, profile, mouth, tooth alignment, tooth shape, tooth color, gums, and overall impression, measured on an 11-point numeric rating scale (0 = very dissatisfied, 10 = very satisfied). Exploratory factor analysis found only 1 factor and high positive loadings for all items (.73 to .94) on the first factor, supporting the unidimensionality of the DES. Conclusions: The OES, developed especially for prosthodontic patients, is a brief questionnaire that assesses orofacial esthetic impacts.
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| 38. |
- Larsson, Pernilla, et al.
(författare)
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Reliability and Validity of the Orofacial Esthetic Scale in Prosthodontic Patients
- 2010
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Ingår i: International Journal of Prosthodontics. - : Quintessence Publishing Co Ltd. - 0893-2174 .- 1139-9791. ; 23:3, s. 257-262
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: This study evaluated the reliability and validity of the Orofacial Esthetic Scale (OES) an instrument assessing self-reported orofacial esthetics in prosthodontic patients. Materials and Methods: The OES has seven items addressing direct esthetic impacts in the orofacial region, as well as an eighth global assessment item. The response format was a 0 to 10 numeric rating scale (very dissatisfied to very satisfied with appearance, respectively). OES summary scores ranged from 0 (worst score) to 70 (best score). Test-retest reliability (n = 27) and internal consistency (n = 119) were assessed. Content validation (asking patients about their satisfaction with the questionnaire content, n = 119) and discriminative validation (comparing OES scores between patients and healthy controls, n = 119) were performed. Convergent validity was assessed by correlating patients own OES scores (n = 29) with ratings from a consensus expert group (n = 4) and with the Oral Health Impact Profile (CHIP) esthetic-item summary score (n = 119). Results: Test-retest reliability was excellent for the OES scores (intraclass correlation coefficient = .96). Internal consistency was satisfactory for esthetically impaired patients (n = 27, Cronbach alpha = .86). Patients rated their satisfaction with the questionnaire content as 7.8 +/- 1.3 units on a 0 to 10 numeric rating scale (0 = very dissatisfied, 10 = very satisfied). OES scores discriminated esthetically impaired patients (31.4 units) from healthy controls (45.9 units, P less than .001). OES scores correlated well with other measures of the same construct (r = .43 for patients own assessment with an assessment by experts using the OES, r = -.72 for a correlation with the OHIPs three esthetic-related items). Conclusions: The OES, developed especially for prosthodontic patients, exhibited good score reliability and validity.
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| 39. |
- Le, Minh, et al.
(författare)
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Clinical outcome of three different types of posterior all-ceramic crowns : a 3-year follow-up of a multicenter, randomized, controlled clinical trial
- 2023
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Ingår i: International Journal of Prosthodontics. - : Quintessence Publishing. - 0893-2174 .- 1139-9791. ; 36:5
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: To assess and compare the clinical outcomes of three different types of all-ceramic posterior monolithic tooth-supported crowns. Materials and Methods: A total of 71 patients received 90 all-ceramic crowns randomized to be either high-translucency zirconia (ZC), high-translucency zirconia with a partial buccal veneer (ZC-V), or lithium disilicate glass-ceramic (LDS). All treatments were performed by four general dentists. Choice of material was blinded. Baseline and subsequent annual evaluation were based on modified California Dental Association (CDA) criteria. A questionnaire was used to include patient-reported outcomes and to compare them to the crown quality rating performed by dentists. Results: A total of 66 patients with 84 crowns were examined after 3 years. The survival rate was 98.8%. No crowns fractured during the observation period. One ZC-V crown failed due to loss of retention, and three complications were noted: loss of retention occurred in one ZC crown, and two ZC crowns needed to be endodontically treated. There was no significant difference between the different crowns regarding marginal integrity, surface, or anatomical form. Both patients and examining dentists rated the crowns favorably regarding esthetics, patients more than dentists. Conclusion: Posterior lithium disilicate glass-ceramic crowns and translucent zirconia crowns with or without a partial buccal veneer show excellent and promising clinical outcomes from a short-term perspective. Patients and dentists rate the restorations favorably concerning esthetics and function.
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| 40. |
- Lindh, T, et al.
(författare)
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Tooth-implant supported fixed prostheses : A retrospective multicenter study
- 2001
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Ingår i: International Journal of Prosthodontics. - 0893-2174 .- 1139-9791. ; 14:4, s. 321-328
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: The purpose of this retrospective multicenter study on implants combined with natural teeth was to investigate the implant survival rate and loss of marginal bone, as well as indications and complications pertinent to this form of implant therapy. Materials and Methods: The study comprised 185 implants in 111 patients from six different clinics in Sweden. Gathering of data, which were taken from patient records, followed a strict protocol. The registrations included indications for treatment, failure of implants, radiographs from baseline and follow-up, and information on complications. Results: The cumulative implant survival was found to be 95.4% (standard error 4.5%) up to 3 years of follow-up. The marginal bone level at baseline was lower in the maxilla compared with the mandible (P = .015), but any further loss did not differ between the jaws. The most severe complication other than loss of osseointegration (6/185) or periimplant infections (4/183) was intrusion of the abutment teeth, which occurred in 5% of the cases. In all instances, the intrusion was seen in constructions with nonrigid forms of connection between the implants and teeth. Conclusion: The tooth-implant supported prosthesis using the Branemark system is in the short term an equally predictable treatment as the completely implant-supported prosthesis concerning implant survival and loss of marginal bone. When combining implants and teeth, a rigid form of connection should be used to prevent tooth intrusion.
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| 41. |
- Liu, Yihong, et al.
(författare)
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Failure Modes and Fracture Origins of Porcelain Veneers on Bilayer Dental Crowns
- 2014
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Ingår i: International Journal of Prosthodontics. - : Quintessence Publishing. - 0893-2174 .- 1139-9791. ; 27:2, s. 147-150
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Tidskriftsartikel (refereegranskat)abstract
- The aims of this study were to determine the fracture origins and crack paths in the porcelain of clinically failed bilayer ceramic restorations and to reveal the correlation between the porcelain failures and material properties. Three clinically failed crowns of each material (bilayer zirconia crowns, galvano-ceramic crowns, and porcelain-fused-to-metal crowns) were collected and underwent failure analysis. The fractures found in porcelain veneers showed several characteristics including wear, Hertzian cone crack, chipping off, and delamination. The results indicated that the fracture origins and features of the porcelain in bilayer ceramic restorations might be affected by the rigidity of core materials and thickness of copings.
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| 42. |
- Marklund, Susanna, et al.
(författare)
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An intraindividual clinical comparison of two metal-ceramic systems : a 5-year prospective study.
- 2003
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Ingår i: International Journal of Prosthodontics. - 0893-2174 .- 1139-9791. ; 16:1, s. 70-3
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: Earlier studies on low-fusing ceramics have shown the occurrence of changes over time regarding surface and color. The present prospective study is an ongoing follow-up of an intraindividual comparison between two metal-ceramic systems, the Procera system (titanium copings veneered with a low-fusing ceramic) and noble-alloy copings veneered with a medium-fusing ceramic. MATERIALS AND METHODS: Twenty-one crown pairs were fabricated for 18 patients. After 5 years, 18 crown pairs in 15 patients were available for comparison. The crowns were examined shortly after cementation (baseline), and after 1, 2, and 5 years. The crowns were rated according to the CDA system. Bleeding index and margin index were also evaluated. RESULTS: Obvious changes regarding surface and color were noted for the titanium-ceramic crowns. The difference between the two types of crowns was statistically significant at 5 years (P = .004). The differences between the two systems regarding anatomic form, margin integrity, bleeding index, and margin index were small. CONCLUSION: Within the limitations of this study, it is concluded that low-fusing ceramic-veneered titanium copings are inferior to medium-fusing ceramic-veneered conventional copings regarding surface and color of the ceramic. Therefore, conventional ceramic-veneered crowns seem to be preferable, at least in the anterior area, where the esthetic requirements are greater than in premolar and molar regions. Whether possible changes in the properties of low-fusing ceramics will reduce the differences between the two types of metal-ceramic crowns remains to be proven.
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| 43. |
- Mattheos, Nikos, et al.
(författare)
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The Implant Supracrestal Complex and Its Significance for Long-Term Successful Clinical Outcomes
- 2021
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Ingår i: International Journal of Prosthodontics. - : Quintessence. - 0893-2174 .- 1139-9791 .- 1942-4426. ; 34:1, s. 88-100
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Forskningsöversikt (refereegranskat)abstract
- Emerging evidence implies significant interrelations between the condition of the peri-implant tissues and the implant-abutment-prosthesis complex. A new paradigm for studying the peri-implant tissues in close interrelation with the implant-abutment-prosthesis complex in the presence of the oral biofilm is essential. The aims of this paper are to introduce the concept of the "implant supracrestal complex" (ISC) and to describe the critical elements that define it as a unique anatomical and functional system of human tissues, mechanical components, and oral bacteria/biofilm. This paper reviews recent evidence to identify the impact of design features on short-term clinical outcomes and long-term health of the peri-implant bone and soft tissues. Prosthetic-driven implant placement is a prerequisite for proper ISC design, which in turn can indirectly influence the structure and dimensions of the peri-implant soft tissues. Design features of the implant-prosthesis-abutment complex, such as the emergence profile, emergence angle, and cervical margin, as well as the design of the implant-abutment and abutment-prosthesis junctions and their locations in relation to the tissues of the ISC, can have a significant impact on the maintenance of stable and healthy peri-implant tissues in the long term.
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| 44. |
- Milleding, P, et al.
(författare)
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Two years of clinical experience with Procera titanium crowns
- 1998
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Ingår i: International Journal of Prosthodontics. - 0893-2174 .- 1139-9791. ; 11:3, s. 224-32
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: The purpose of the study were to evaluate the clinical performance of the Procera porcelain-fused-to-titanium crown system in general practice during a 2-year period, and to evaluate the performance of a new low-fusing porcelain as a veneering material on titanium.MATERIALS AND METHODS: A number of consecutive complete-coverage crowns (40) in 25 patients (14 women and 11 men) with a mean age of 53.1 years (range 35 to 79 years) were made according to the Procera (Nobel Biocare) technique in a 3-month period. The titanium copings were fabricated from solid rods of pure titanium using spark erosion and copy-milling technique, whereafter they were veneered with a new type of low-fusing ceramic material. The crowns were evaluated using the CDA criteria at baseline and after 2 years.RESULTS: The general failure rate was low and was restricted to one carious lesion, one porcelain fracture, and one loss of a crown resulting from failure of retention of a post and core. The most frequent single reason that the "excellent" color level was not recorded was a "too-high value." A slightly dull or granular porcelain surface was observed both at baseline and after 2 years. Overall, the responses of the patients were positive.CONCLUSION: Within the limitations of the study it can be concluded that porcelain-veneered Procera titanium crowns can be used as an alternative to other porcelain-fused-to-metal systems. However, conclusions should be made with caution from the results of this study because of the limited number of patients and crowns and the short observation period.
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| 45. |
- Molin, Margareta K, et al.
(författare)
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Five-year clinical prospective evaluation of zirconia-based Denzir 3-unit FPDs
- 2008
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Ingår i: International Journal of Prosthodontics. - Hanover Park : Quintessence Publishing. - 0893-2174 .- 1139-9791. ; 21:3, s. 223-227
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: The aim of this prospective study was to evaluate the clinical performance of fully sintered hot isostatic pressed yttria-partially-stabilized zirconia (Denzir) 3-unit fixed partial dentures (FPDs).Materials and Methods: Nineteen 3-unit FPDs were placed in 18 patients. Ten FPDs were placed in the maxilla and 9 in the mandible. Two calibrated examiners evaluated the FPDs independently 1 week (baseline), 1 year, 3 years, and 5 years after placement using the California Dental Association quality evaluation system.Results: All FPDs were intact at the 5-year examination. One FPD lost retention after 12 months but remained intact; it was recemented and is still in function after 5 years. All FPDs were rated satisfactory over 5 years. No changes were seen in terms of color and anatomic form. The number of slightly rough or pitted occlusal surfaces increased approximately 30% over 5 years. Visible evidence of ditching along the margin increased over time, but only for those FPDs luted with zinc phosphate cement.Conclusion: The 5-year results indicate that yttria-partially-stabilized zirconia 3-unit FPDs with anatomically designed frameworks are promising prosthetic alternatives, even in the premolar and molar regions. However, for all-ceramic FPDs with more units in function, further studies are necessary.
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| 46. |
- Narby, Birger, et al.
(författare)
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Changes in attitudes toward desire for implant treatment : a longitudinal study of a middle-aged and older Swedish population
- 2008
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Ingår i: International Journal of Prosthodontics. - : Quintessence. - 0893-2174 .- 1139-9791. ; 21:6, s. 481-485
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: To assess, at a 10-year interval, changes in attitudes toward desire for implant treatment among middle-aged and older Swedish subjects with respect to dental status. MATERIALS AND METHODS: Three thousand subjects, residents of Orebro County, Sweden, were surveyed via the same questionnaire in 1989 and again in 1999 regarding their possible need for and interest in implant-based prosthodontic treatment. RESULTS: One thousand six hundred sixty-five subjects responded to both surveys. In 1989 few respondents indicated an interest in implant treatment, whereas in 1999, 92% of those who had not indicated an interest in the earlier survey now indicated that they desired implant treatment. The cohort reporting having no teeth had a considerable lower increase in desire. Among those who reported a possible treatment need (ie, missing 1 or more teeth and had not had them replaced or those who wore complete dentures), cost was the most commonly cited reason for declining implant treatment. CONCLUSIONS: There was a dramatic increase in the interest for implant treatment over the period from 1989 to 1999. Changes in awareness of implant treatment, along with an expansion in the number of qualified providers, may have contributed to this increase.
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| 47. |
- Narby, Birger, et al.
(författare)
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Factors explaining desire for dental implant therapy : analysis of the results from a longitudinal study
- 2011
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Ingår i: International Journal of Prosthodontics. - : Quintessence. - 0893-2174 .- 1139-9791. ; 24:5, s. 437-444
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: The aim of this research was to investigate possible factors behind the desire for and changes in attitude toward implant treatment in a population of middle-aged and older individuals in Sweden. MATERIALS AND METHODS: In 1989 and 1999, questionnaires were sent to 3,000 residents in Orebro County, Sweden. Response rates were 79% and 68%, respectively. Those responding to both questionnaires yielded a longitudinal study panel. Logistic regression models were done with "desire of implant treatment" and "changes in desire of implant treatment" as dependent variables. RESULTS: Older people, non-city residents, and those with one or several missing and unreplaced teeth changed their desire for implant treatment between study years. Effects of age, residence, and better dental status disappeared during the 10-year study period. Those who were edentulous and those with removable dentures (pseudo R2: 0.17) expressed lower desire for treatment than those with all teeth remaining or only one or a few teeth missing (pseudo R2: 0.24) in 1989. High income significantly increased the probability to desire implant treatment for the study panel at both study occasions (P = .016 and P = .034 for 1989 and 1999, respectively). CONCLUSIONS: Factors influencing desire for implant treatment were primarily income and dental status. The influence of young age, urban living, and dental status regarding the subgroup with one or several teeth missing in relation to those with all their teeth disappeared during the 10-year study period
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| 48. |
- Narby, Birger, et al.
(författare)
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Grounded theory on factors involved in the decision-making processes of patients treated with implant therapy
- 2012
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Ingår i: International Journal of Prosthodontics. - : Quintessence. - 0893-2174 .- 1139-9791. ; 25:3, s. 270-278
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: The aims of this research were to describe the process leading to desire for implant treatment, describe how patients missing teeth gained information about implant treatment, identify gatekeeping factors for implant treatment, and note experiences in changes in oral health-related quality of life. MATERIALS AND METHODS: The constant comparative method for a grounded theory was used in collecting and analyzing data. Ten informants participated in the study, all of whom were treated with implant-supported fixed dentures during the past year. RESULTS: The emerging core category was that participants experienced a journey from social stigma to exhilaration. This process ended in the perspective that the participants' new lives with dental implants were very good and meant an end to their social stigma, but gatekeeping factors before treatment, such as cost and dental anxiety, were noted. The dentist's opinion and suggestions were the most decisive part of the decision-making process, and trust in the dentist and dental team was crucial in the decision to undergo treatment and in the overall treatment experience. Great improvement in oral health-related quality of life was noted. CONCLUSION: This qualitative study gives as the core category and main finding the importance of patients' trust and confidence in the dentist and his/her staff in the process of transforming desire for dental implant treatment into demand and also in making it more likely for patients to be satisfied with treatment regardless of complications.
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| 49. |
- Narby, Birger, et al.
(författare)
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Prosthodontics and the patient : Part 2: Need becoming demand, demand becoming utilization
- 2007
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Ingår i: International Journal of Prosthodontics. - : Quintessence. - 0893-2174 .- 1139-9791. ; 20:2, s. 183-189
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: Patients' oral health needs are estimated through dialogue and professional assessment. The concepts of need and demand are vital to studies of dental care and oral health. Need does not always lead to demand for treatment or to utilization, depending on the gatekeeping processes between need and demand and between demand and utilization. Demand must be accepted with the understanding that there is no objective need and that demand depends on the patient's opinion. In accordance with this, the need for prosthodontic treatment is highly individual and is not automatically related to oral health status, making need and demand difficult to measure in that respect. Therefore, sociodental factors should be included and evaluated in studies of need and demand for utilization of prosthodontic care. MATERIALS AND METHODS: This theoretical and analytic paper focuses on the gatekeeping processes between need and demand and between demand and utilization of prosthodontic care. RESULTS: The concept of gatekeeping refers to the social and psychologic processes that transform need into demand and demand into utilization. It implies that they are complex processes that can render great differences between demand and actual utilization. CONCLUSION: It is not possible to estimate a patient's needs for prosthodontic care, since there is no objective need. Demand and utilization are factors that play an important role in the gatekeeping process. These factors are dependent on the patient's opinion, which is influenced by numerous factors.
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| 50. |
- Narby, Birger, et al.
(författare)
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Prosthodontics and the patient: what is oral rehabilitation need? Conceptual analysis of need and demand for prosthodontic treatment. Part 1: a conceptual analysis
- 2005
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Ingår i: International Journal of Prosthodontics. - 0893-2174 .- 1139-9791. ; 18:1, s. 75-79
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: The concepts of need and demand are central in studies on dental care. In the literature, a normative definition is often used, but it pays little attention to the individual's personal comfort and quality of life. Need and demand for prosthodontic services are difficult to measure, as prosthodontic treatment is highly individual and not closely related to edentulousness. Need, however defined, does not always lead to demand for treatment, depending on a variety of factors. MATERIALS AND METHODS: The present article is part of a larger study in which the intention is to evaluate need and demand for prosthodontic treatment among the participants in a 1989 and 1999 longitudinal study of a population sample. As the first step, this article reports a conceptual analysis of the need concept from the literature. RESULTS: Need is stated as socially established in the interaction between patient and clinician. It makes demand dependent on available treatment options from the care provider and society. In the prosthetic treatment decision-making process, the emancipatory perspective with the patient-clinician dialogue is of utmost importance to achieve an optimal treatment result. CONCLUSION: The professional attitude toward need must be that there is no true objective or subjective need. Need is established only in a communicative dialogue with mutual respect between the professional and the patient.
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