Heereveld, P.C. van (Christiaan) (2012) Curved implant abutments in the aesthetic zone: a randomized clinical trial. thesis, Dentistry.
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Abstract
Abstract Objectives The goal of this randomized clinical trial was to assess the performance of experimental curved abutments compared to regular straight abutments for single implants in the aesthetic zone. If the experimental design shows a favorable hard and soft tissue outcome, the circumferential groove might be used in the design of future implant abutments. It is hypothesized that the experimental curved abutment exhibits a superior clinical performance over the straight abutment. Material and methods Twenty-six subjects with two missing non-adjacent teeth in the aesthetic zone (region 15-25) received two dental implants. After a healing period of six months, one implant was restored with a curved abutment (experimental) and the other with a regular straight abutment (control). This was achieved in a split mouth setup with left-right randomization. Eight weeks after abutment installation, definitive cement-retained crowns were made. Peri-implant marginal bone loss was measured on radiographs immediately after definitive crown placement to one year thereafter. Furthermore, the aesthetic outcome using the Pink Esthetic Score (PES) and probing depths were measured at both visits. The following variables were analyzed because they might provide a (confounding) predictive value: the amount of peri-implant bone loss between implant placement and immediately after definitive crown cementation, abutment angle, plaque presence, gingival bleeding and width of the attached mucosa. Results The mean peri-implant marginal bone loss from definitive crown cementation to one year thereafter was 0.00 ± 0.37 mm in the experimental group and 0.12 ± 0.27 mm in the control group. Differences were not significant (p=0.25). At the one year follow-up visit, the curved abutment scored a mean PES score of 10 ± 2.3 and the straight abutment scored 9.7 ± 2.3. The differences were not significant (p=0.46). Correlation and regression analysis showed no hints of predictive behavior for the possible confounding variables. Conclusion This study shows that, for the restoration of a single implant in the aesthetic zone, a curved abutment design has no improved performance over a conventional straight abutment design.
| Item Type: | Thesis (Thesis) |
|---|---|
| Supervisor name: | Hartog, dr L. den and Implantoloog UMCG |
| Faculty: | Medical Sciences |
| Date Deposited: | 25 Jun 2020 10:49 |
| Last Modified: | 25 Jun 2020 10:49 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/997 |
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