| 1. |
- Athab Abduljabbar, Zahra, et al.
(författare)
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Chewing side preference and laterality in patients treated with unilateral posterior implant-supported fixed partial prostheses
- 2022
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Ingår i: Journal of Oral Rehabilitation. - : Wiley. - 0305-182X .- 1365-2842. ; 49:11, s. 1080-1086
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Tidskriftsartikel (refereegranskat)abstract
- Background: It is not clear to what extent chewing is improved by unilateral oral rehabilitation with implant-supported fixed partial prostheses (ISFPPs). Objectives: This study aimed to investigate whether patients treated with unilateral ISFPPs in the maxilla use their prostheses during mastication to the same extent as they used their contralateral natural teeth. A further aim was to investigate whether there is a correlation between preferred chewing side and laterality. Methods: Chewing side preference was assessed in 15 participants treated with unilateral ISFPPs in the maxilla. The first, second, third, fifth and tenth chewing cycles were assessed, and the test was repeated 10 times. All participants also answered a questionnaire about their chewing side preference. Results: Most of the participants presented bilateral chewing, but two (13%) chewed only on the ISFPP. There was no statistically significant association between the objectively assessed chewing side and dental status (natural teeth or ISFPPs) during any of the recorded chewing cycles (p >.1). There were statistically significant correlations between both the subjectively reported usually preferred chewing side and the subjective chewing side preference during the test and the objectively assessed chewing side for the first three chewing cycles (p <.01). No correlation was found between handedness and the objectively assessed chewing side. Conclusion: In the present study, most participants chewed bilaterally, and chewing was performed both on the ISFPP and on the natural teeth. No correlation was found between the preferred chewing side, objectively or subjectively determined and laterality.
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| 2. |
- Branzén, Marie, et al.
(författare)
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Implant-Supported Single Crowns Replacing Congenitally Missing Maxillary Lateral Incisors : A 5-Year Follow-Up
- 2015
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Ingår i: Clinical Implant Dentistry and Related Research. - : Wiley-Blackwell. - 1523-0899 .- 1708-8208. ; 17:6, s. 1134-1140
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Tidskriftsartikel (refereegranskat)abstract
- Background: Knowledge of the long-term survival of single implants in cases of congenitally missing lateral incisors in the maxilla is limited.Purpose: This retrospective study aimed to evaluate the 5-year survival of implants and implant-supported crowns (ISCs) and to assess the functional and aesthetic outcomes from the professional and patient perspectives.Materials and Methods: From a total of 46 patients with congenitally missing upper lateral incisors, 36 patients treated with 54 Branemark (R) (Nobel Biocare AB, Goteborg, Sweden) implants and ISCs participated in the study. A clinical examination, California Dental Association (CDA) evaluation, and patient questionnaire were used to rate and compare the objective and subjective evaluations of the ISCs.Results: The survival of implants and ISCs was 100%. The CDA ratings were satisfactory for all ISCs, with 70% being rated excellent. The patient rating was also high for the overall satisfaction item, with 21 being completely satisfied and 14 fairly satisfied. However, 12 patients wished for the replacement of their ISCs. Logistic regression analysis indicated that a less optimal embrasure fill was the most discriminating factor though not statistically significant (p = .082).Conclusions: One-third of the patients wished for the replacement of their ISCs. Soft tissue adaptation seems to be an important factor for overall satisfaction.
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| 3. |
- Eliasson, Alf, 1957-, et al.
(författare)
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A clinical evaluation of cobalt-chromium metal-ceramic fixed partial dentures and crowns : A three- to seven-year retrospective study
- 2007
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Ingår i: The Journal of prosthetic dentistry (Print). - : Elsevier. - 0022-3913 .- 1097-6841. ; 98:1, s. 6-16
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Tidskriftsartikel (refereegranskat)abstract
- Statement of problem: In severely compromised dentition, loading of long-span and cantilever metal-ceramic fixed partial dentures (FPDs) could result in framework deformation and porcelain fractures. The use of cobalt-chromium (Co-Cr) alloys may be advantageous, but there is little information on the longevity of, and complications with, prostheses made with these alloys.Purpose: The aim of this retrospective study was to report the survival and complication rates of Co-Cr metal-ceramic FPDs and crowns followed over a 3- to 7-year period.Material and methods: The study included 42 patients with a total of 51 FPDs and 12 single crowns assigned to 1 of 3 groups. The 3 groups comprised patients with abutment teeth with a questionable prognosis (n=10), advanced chronic periodontitis (n=19), or abutment teeth with a positive prognosis (n=13). The FPDs had a mean of 9.7 units (range of 3–14). Of the FPDs, 32 were provided with a cantilever on 1 side (n=24) or both sides (n=8). The mean observation time was 51 months (range of 28–82). All patients were examined by 2 independent prosthodontists using the California Dental Association (CDA) assessment system for evaluation. One-way ANOVA with Fisher's LSD post hoc test and the Mann-Whitney U test were used for statistical analyses (α=.05).Results: Seventeen (34%) of the FPDs had biological and/or technical complications. Six (12%) FPDs were completely or partially removed during the observation period, 1 framework fractured, and 9 (17.6%) FPDs had ceramic fractures. Fifteen of the 21 fractured FPD units were related to FPDs that were placed in 3 patients with bruxing habits. The CDA rating for marginal integrity was “excellent” for more than 98% of the abutments. No patients reported adverse reactions to the material.ConclusionsMetal-ceramic FPDs made of cobalt-chromium alloy performed acceptably in the questionable prognosis and advanced chronic periodontitis groups.
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| 4. |
- Eliasson, Alf, 1957-, et al.
(författare)
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Five-year results with fixed complete-arch mandibular prostheses supported by 4 implants
- 2000
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Ingår i: International Journal of Oral & Maxillofacial Implants. - : Quintessence Publishing. - 0882-2786 .- 1942-4434. ; 15:4, s. 505-510
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Tidskriftsartikel (refereegranskat)abstract
- This study examined whether it is possible to restore an edentulous mandible with a complete-arch fixed prosthesis retained by only 4 implants without decreasing the survival rate. One hundred nineteen patients received complete-arch mandibular prostheses retained by 4 implants. Most patients were followed for 3 years or more. All patients followed a routine protocol, including annual check-ups and regular radiographic examinations. Twenty-one patients dropped out. Radiographic measurements used the threads of the implants as a basis for comparison. No indication was found that the number of supporting implants could have influenced the observed frequency of technical and surgical complications. Three implants were lost, 2 after 1 year and 1 after 5 years. A statistically significant difference in bone loss between the mesial and distal implants was found. The number of fractured resin teeth in mandibular prostheses was higher when patients had an implant-supported prosthesis in the maxilla. The present study revealed an implant survival rate of 98.6% after 5 years. Therefore, it was concluded that there may not be a need for more than 4 implants to support a fixed mandibular prosthesis, when implants at least 10 mm long can be used.
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| 5. |
- 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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| 6. |
- Hedlund, Maria, et al.
(författare)
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Femårsöverlevnad för keramikkronor
- 2017
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Ingår i: Tandläkartidningen. - : Sveriges Tandläkarförbundet/Swedish Dental Association. - 0039-6982 .- 2002-7222. ; 3, s. 66-70
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 7. |
- Johansson, Louise, et al.
(författare)
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Frequency of apical periodontitis in root-filled teeth restored with post and core : A 5-year retrospective study
- 2024
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Ingår i: Clinical and Experimental Dental Research. - : John Wiley & Sons. - 2057-4347. ; 10:3
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: In conjunction with post placement in root-filled teeth with periapical healthy conditions, root canal retreatment may be performed to improve the seal of the root canal. Whether root canal retreatment for technical reasons (retreatments in teeth without apical periodontitis (AP)) results in lower frequency of AP is unknown.OBJECTIVE: To examine whether there is a difference in frequency of AP between roots with root canals retreated for technical reasons, and roots with root canals not retreated before post placement, with a minimum follow-up of 5 years. Also, to examine changes in root filling quality following root canal retreatment for technical reasons.METHODS: This retrospective study included radiographs of 441 root-filled roots without periapical radiolucencies at baseline, scheduled for post and core treatment. Follow-up data for a minimum of 5 years were available for 305 roots (loss to follow-up 30.8%), 46 of which were retreated for technical reasons. Two calibrated observers assessed root filling sealing quality and length, respectively, and periapical status according to the Periapical Index. The main outcome of the study, AP, was used as the dependent variable and all analyses were performed at root level.RESULTS: The overall frequency of AP at follow-up was 13.8%. The difference in frequency of AP between retreated (4.3%) and nonretreated (15.4%) root canals was not statistically significant, p = .061. Analyses including only roots with preoperatively inadequate root filling quality showed a statistically significant difference (p = .017) between the two treatment groups (2.4% vs. 22.9%).CONCLUSIONS: Root canal retreatment for technical reasons before post and core placement significantly reduces the frequency of AP in roots with inadequate root filling quality.
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| 8. |
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| 9. |
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| 10. |
- Ladd, Brenton, et al.
(författare)
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Carbon isotopic signatures of soil organic matter correlate with leaf area index across woody biomes
- 2014
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Ingår i: Journal of Ecology. - : Wiley. - 0022-0477 .- 1365-2745. ; 102:6, s. 1606-1611
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Tidskriftsartikel (refereegranskat)abstract
- Leaf area index (LAI), a measure of canopy density, is a key variable for modelling and understanding primary productivity, and also water use and energy exchange in forest ecosystems. However, LAI varies considerably with phenology and disturbance patterns, so alternative approaches to quantifying stand-level processes should be considered. The carbon isotope composition of soil organic matter (C-13(SOM)) provides a time-integrated, productivity-weighted measure of physiological and stand-level processes, reflecting biomass deposition from seasonal to decadal time scales.Our primary aim was to explore how well LAI correlates with C-13(SOM) across biomes.Using a global data set spanning large environmental gradients in tropical, temperate and boreal forest and woodland, we assess the strength of the correlation between LAI and C-13(SOM); we also assess climatic variables derived from the WorldClim database.We found that LAI was strongly correlated with C-13(SOM), but was also correlated with Mean Temperature of the Wettest Quarter, Mean Precipitation of Warmest Quarter and Annual Solar Radiation across and within biomes.Synthesis. Our results demonstrate that C-13(SOM) values can provide spatially explicit estimates of leaf area index (LAI) and could therefore serve as a surrogate for productivity and water use. While C-13(SOM) has traditionally been used to reconstruct the relative abundance of C-3 versus C-4 species, the results of this study demonstrate that within stable C-3- or C-4-dominated biomes, C-13(SOM) can provide additional insights. The fact that LAI is strongly correlated to C-13(SOM) may allow for a more nuanced interpretation of ecosystem properties of palaeoecosystems based on palaeosol C-13 values.
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