| 1. |
- Carlsson, Gunnar E, 1930, et al.
(författare)
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What is the evidence base for the efficacies of different complete denture impression procedures? A critical review.
- 2013
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Ingår i: Journal of dentistry. - : Elsevier BV. - 1879-176X .- 0300-5712. ; 41:1, s. 17-23
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Forskningsöversikt (refereegranskat)abstract
- OBJECTIVES: Many procedures used in prosthodontics, including the materials and methods used for complete denture impressions, lack support of good evidence. The aims were to systematically, and critically, review the literature on complete denture impression materials and methods to identify an impression procedure that can be considered expedient for achieving a satisfactory clinical outcome for complete denture wearers. DATA AND SOURCES: MEDLINE/PubMed and the Cochrane Library were searched for studies on impression procedures used in the clinical fabrication of complete dentures. The search focused on best available evidence with respect to clinical outcome. STUDY SELECTION: PubMed listed 1201 titles for the combination terms of complete denture and impression. Five relevant randomized controlled trials were identified. No review of complete denture impressions was found in the Cochrane Library. RESULTS: Two-step procedures for complete denture impressions dominate all textbooks, teaching and specialist practice, despite an absence of convincing evidence of its superiority. No controlled studies supporting the use of border moulding, post-dam, and functional and mucostatic impressions, were identified. Two studies showed that a one-step method using alginate in a stock tray offers a similar clinical result to more complicated, expensive and time-consuming two-step material and technique combinations. CONCLUSIONS: There was no support for the frequent textbook statement that the two-step procedure is necessary and superior to the one-step method. While some special clinical situations may benefit from other combinations of materials and techniques, the results suggest that the simple and inexpensive one-step procedure can serve the needs of the majority of edentulous patients. CLINICAL SIGNIFICANCE: In spite of the fact that two-step procedures for complete denture impressions dominate textbooks, teaching and specialist practice, the results of this review suggest that a simple and inexpensive one-step procedure can serve the needs of the majority of edentulous patients.
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| 2. |
- Eliasson, Alf, 1957-, et al.
(författare)
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The Accuracy of an Implant Impression Technique Using Digitally Coded Healing Abutments.
- 2012
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Ingår i: Clinical Implant Dentistry and Related Research. - : Wiley. - 1523-0899 .- 1708-8208. ; 14:Supplement 1
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Tidskriftsartikel (refereegranskat)abstract
- Background: A healing abutment (Encode®) provided with digitally coded information on length and diameter on the top was launched in 2007. So far, no study has evaluated working cast fabrication using impressions of the coded abutments and analogue placement using a robot technique. Purpose: To compare the accuracy of implant analogue placement in working casts using a robot technique and an impression of Encode healing abutments, with the traditional technique. Materials and Methods: One acrylic master model was fabricated, provided with two groups of three implant analogues. Encode healing abutments were mounted on the test side and conventional pickup impression copings were inserted on the control side. Fifteen impressions were made with a vinylpolysiloxane material. Implant analogues were placed by a robot on the test side. The center point of each implant analogue fitting surface was measured with a laser measuring machine in the x-, y-, and z-axis, as were also the angular direction of the center axis and the position of the antirotational hex. Two-way analysis of variance was performed using SPSS 17.0; the statistical significance was set at p<.05. Results: Mean center point deviation for the test and control side was 37.4µm versus 18.5µm (p=.001) in the x-axis, 47.3µm versus 13.9µm (p<.001) in the y-axis, and 35.0µm versus 15.1µm (p<.013) in the z-axis. Mean angle error was 0.41 degrees for the test and 0.14 degrees for the control side (p<.001). Mean rotation of the hexagon was 2.88 degrees for the test side and 1.82 degrees for controls (p<.001). Conclusions: Both conventional and robot technique presented low levels of displacement of the implant analogues in all casts. The test technique was less precise, but the difference in accuracy was small, and both techniques are precise enough for single crowns and short-span, implant-supported fixed partial prostheses.
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| 3. |
- Eliasson, Alf, 1957, et al.
(författare)
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The accuracy of implant impressions with digitally coded healing abutments
- 2010
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Ingår i: 19th Annual Scientific Meeting of the European Association of Osseointegration – 6-9 October 2010, Glasgow.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Background: A new healing abutment (Encode®) provided with digital coded information on length and diameter on the top, has been launched. So far no studies have evaluated working cast fabrication using impressions of the digitally coded abutment and implant analog placement by a robot technique (Robocast®). Purpose: To compare the accuracy of implant analog placement in working casts with a robot technique using an impression of digitally coded healing abutments, and the traditional technique with implant pick-up impression copings. Materials and methods: One acrylic master model provided with three reference spheres and two groups of three implant analogs placed bilaterally, was fabricated. Three Encode® healing abutments were mounted on the right side (test) and conventional pick-up impression copings on the left side (control). Fifteen impressions were made with silicone material in customized trays. Implant analogs were placed manually on the impression copings (control) in the impression before pouring with dental stone. After setting of the stone cast, analogs on the test side were placed by the Robocast® technique using information gathered from a scanning of the digitally coded abutments. Implant analogs positions were measured with a Laser Measuring Machine. The center-point of each implant analog fitting surface were registered in x-, y-, z-axis as well as angular direction of center axis and position of the antirotational hex. Two-way ANOVA analyses were performed using SPSS 17.0, the statistical significance was set at P<0.05. Results: None of the two impression techniques presented working casts without distortion of the implant analogs positions as compared to the master model. Mean (SD) center-point distortion for test and control side were in x-axis 37 (28) μm and 18 (13) μm, respectively P<.005, in y-axis 47 (35) μm and 14 (11) μm, respectively P.001, and in z-axis 35 (29) μm and 15 (15) μm, respectively P<.05. Mean angular distortions were 0.41 (0.25) degrees for the tests and 0.14 (0.11) degrees for the controls P0.001. Mean rotation of the hexagon was 2.88 (1.60) degrees for test and 1.82 (0.63) degrees for controlP0.001. Conclusions: Within the limitations of this study, the following conclusions can be drawn: Both conventional and digital impression technique presented low levels of distortion of the implant analogs positions in all casts. A silicon impression of digitally coded abutments and a robot placement technique resulted in a less precise analog placement as compared to conventional impression technique. However, the differences in accuracy were small and both techniques are precise enough for single crowns and short span implant supported fixed partial prostheses.
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| 4. |
- Eliasson, Alf, 1957-, et al.
(författare)
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The precision of fit of milled titanium implant frameworks (I-Bridge) in the edentulous jaw.
- 2010
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Ingår i: Clinical implant dentistry and related research. - : Wiley. - 1708-8208 .- 1523-0899. ; 12:2, s. 81-90
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: New computer numeric controlled (CNC)-milled frameworks for implant-supported prostheses have been introduced. However, no data are available on the precision of fit of these new frameworks. PURPOSE: The purpose of this study is to evaluate the precision of fit of a new CNC-milled framework technique (I-Bridge, Biomain AB, Helsingborg, Sweden) using Brånemark System (Nobel Biocare AB, Göteborg, Sweden) and NobelReplace (Nobel Biocare AB) system implants. MATERIALS AND METHODS: Ten test frameworks were fabricated for one master model for each implant system. Five additional frameworks were fabricated for five different models simulating clinical cases as controls (Brånemark System). The distortion of implant center point positions was measured in x-, y-, and z-axes and in three dimensions by using a contact-type coordinate measuring machine and a computer program developed specifically for this purpose. Mann-Whitney U-test was used to compare differences of distortion within and between the groups. RESULTS: The maximal distortion in arch width (x-axis) and curvature (y-axis) was within 71 and 55 microm for all frameworks, respectively. The mean distortion in absolute figures in x-, y-, z-axes and three dimensions was for "clinical control" frameworks 23, 26, 4, and 34 microm as compared with less than 12, 12, 2, and 17 microm for Brånemark and NobelReplace frameworks, respectively. Control frameworks showed significantly (p < .05) greater mean and range of distortions in x- and y-axes and in three dimensions compared with test frameworks. CONCLUSION: All measured frameworks presented signs of misfit, indicating that no framework had a "passive fit." Frameworks produced in a more routine clinical environment seem to present greater levels of distortion as compared with frameworks produced in a strict test situation. However, all measured frameworks presented levels of precision of fit within limits considered to be clinically acceptable in earlier studies of frameworks placed on abutments.
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| 5. |
- Engfors, Ingela, et al.
(författare)
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Fixed implant-supported prostheses in elderly patients: a 5-year retrospective study of 133 edentulous patients older than 79 years.
- 2004
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Ingår i: Clinical implant dentistry and related research. - 1523-0899. ; 6:4, s. 190-8
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: An increasing number of elderly patients are treated with implants, but results for the elderly patient in terms of implant success and adaptation to implant prostheses are contradictory. OBJECTIVE: To retrospectively study the 5-year clinical and radiologic performances of fixed implant-supported prostheses placed in edentulous elderly patients and to compare those results with the results of using similar prostheses in a control group of younger patients. MATERIALS AND METHODS: The study group comprised 133 edentulous patients who were 80 or more years of age and who were consecutively treated with fixed implant-supported prostheses between January 1986 and August 1998. Altogether 761 Brånemark System implants (Nobel Biocare AB, Göteborg, Sweden) were placed in 139 edentulous jaws. The control group comprised 115 edentulous patients who were younger than 80 years and who were treated consecutively from March 1996 to November 1997 with similar prostheses. In this group 670 implants were placed in 118 edentulous jaws. Information was collected from all postinsertion visits, including the fifth annual checkup, and changes of marginal bone levels were analyzed from intraoral radiographs. RESULTS: The 5-year cumulative survival rate (CSR) for implants in the maxilla was 93.0% in the study group and 92.6% in the control group; the corresponding CSRs for implants in the mandible were 99.5% and 99.7%. The most common complications for patients in the study group were soft tissue inflammation (mucositis) and cheek and lip biting (p < .05) whereas resin veneer fractures were the most common complications for the control group. Overall 5-year marginal bone loss for the study group was 0.7 mm (standard deviation [SD], 0.45) in the upper jaw and 0.6 mm (SD, 0.50) in the lower jaw. Differences in bone levels and bone loss between the two groups did not reach significant levels (p > .05). CONCLUSIONS: Implant treatment in the elderly patients showed treatment results comparable to those observed in younger age groups. However, indications of more problems with adaptation could be observed and were reflected in more postinsertion problems. Cleaning problems and associated soft tissue inflammation (mucositis) as well as tongue, lip, and cheek biting were significantly more often observed among the elderly patients (p < .05).
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| 6. |
- Franke Stenport, Victoria, 1970, et al.
(författare)
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Onlay and inlay bone grafts with platelet-rich plasma: histologic evaluations from human biopsies.
- 2011
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Ingår i: Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons. - : Elsevier BV. - 1531-5053 .- 0278-2391. ; 69:4, s. 1079-85
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The aim of the present study was to histomorphometrically evaluate biopsies from 1) sinus inlay bone grafts prepared with or without platelet-rich plasma (PRP) and 2) onlay bone grafts in the anterior maxilla with particulate bone and PRP or block bone without PRP after 3 months.
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| 7. |
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| 8. |
- Hjalmarsson, Lars, 1958, et al.
(författare)
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Precision of fit to implants: a comparison of Cresco™ and Procera® implant bridge frameworks.
- 2010
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Ingår i: Clinical implant dentistry and related research. - : Wiley. - 1708-8208 .- 1523-0899. ; 12:4, s. 271-80
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Tidskriftsartikel (refereegranskat)abstract
- The Cresco™ (Astra Tech AB, Mölndal, Sweden) method aims to reduce the inevitable distortions when cast metal frameworks for implant-supported prostheses are fabricated. However, limited data are available for the precision of fit for this method.
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| 9. |
- Norström, Veronika, 1975, et al.
(författare)
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A Three-Year Retrospective Study on Survival of Ceramic-Veneered Zirconia (Y-TZP) Fixed Dental Prostheses Performed in Private Practices
- 2017
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Ingår i: International Journal of Dentistry. - : Hindawi Limited. - 1687-8728 .- 1687-8736. ; 2017
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Tidskriftsartikel (refereegranskat)abstract
- Abstract Objectives. The aim of this retrospective study was to evaluate the three-year clinical outcome for ceramic-veneered zirconia fixed dental prostheses (FDPs). Methods. All patients who were treated with ceramic-veneered zirconia FDPs, in three private practices in Sweden, during the period June 2003 to April 2007 were included. Case records from 151 patients, treated with a total of 184 zirconia FDPs (692 units), were analysed for clinical data. All complications noted in the charts were registered and compared to definitions for success and survival and statistical analysis was performed using the Kaplan-Meier method and a Cox regression model. Results. In total, 32 FDPs in 31 patients experienced some type of complication (17.4% of FDPs, 20.5% of patients). Core fractures occurred in two (1.1%) FDPs. Two (1.1%) FDPs or 0.6% of units showed adhesive veneer fractures. Cohesive veneer fractures occurred in 10 (5.4%) FDPs (1.6% of units). The three-year cumulative success and survival rates (CSR) were 82.3% and 95.2%, respectively. Conclusions. Ceramic-veneered zirconia is a promising alternative to metal-ceramic FDPs, even in the posterior area. However, the higher survival rate of metal-ceramic FDPs should be noted and both dentists and patients must be aware of the risks of complications.
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| 10. |
- Svanborg, Per, 1978, et al.
(författare)
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A 5-Year Retrospective Study of Cobalt-Chromium-Based Fixed Dental Prostheses
- 2013
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Ingår i: International Journal of Prosthodontics. - 0893-2174. ; 26:4, s. 343-349
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: The aim of this retrospective study was to evaluate the 5-year clinical outcome for ceramic veneered cobalt-chromium (Co-Cr) fixed dental prostheses (FDPs) fitted in a private clinical setting. Materials and Methods: All patients treated consecutively with Co-Cr FDPs from January 2000 to November 2005 were included, and complications were registered. Patient records were examined for details on the restorations and abutment teeth. A total of 149 patients with 201 FDPs, 1,135 units, and 743 abutment teeth were recorded. Results: Of the 149 patients, 122 (82%) were followed for 5 years. Complications occurred in 34 patients (23%) and 38 FDPs (19%). The most frequent were caries (6.7% of patients, 5% of FDPs, 2.2% of abutments) and cement failure (6.7% of patients, 5% of FDPs, 3.1% of abutments). Cohesive ceramic fractures occurred in only 7 FDPs (3.5% of FDPs, 0.7% of units). No adhesive ceramic fractures were recorded. The 5-year cumulative rates for success and survival were 83.8% and 92.8%, respectively. Conclusions: Co-Cr FDPs appear to be a promising prosthodontic treatment modality, presenting low incidence of complications and a high survival rate during the first 5 years of function. However, long-term randomized controlled studies are necessary to confirm these findings.
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