| Item type: | Article | ||||
|---|---|---|---|---|---|
| Journal or Publication Title: | Dental Materials | ||||
| Publisher: | Elsevier | ||||
| Place of Publication: | OXFORD | ||||
| Volume: | 32 | ||||
| Number of Issue or Book Chapter: | 6 | ||||
| Page Range: | pp. 765-774 | ||||
| Date: | 2016 | ||||
| Institutions: | Medicine > Lehrstuhl für Zahnärztliche Prothetik | ||||
| Identification Number: |
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| Keywords: | ALL-CERAMIC RESTORATIONS; CORTICAL BONE THICKNESS; FRACTURE-RESISTANCE; SINGLE-TOOTH; DENTAL IMPLANT; ORAL IMPLANTS; LABORATORY SIMULATION; STRESS-DISTRIBUTION; TITANIUM IMPLANTS; FINITE-ELEMENT; Zirconia implant; Two-piece implant; Abutment; Ceramic; Chewing simulation; Fracture resistance | ||||
| Dewey Decimal Classification: | 600 Technology > 610 Medical sciences Medicine | ||||
| Status: | Published | ||||
| Refereed: | Yes, this version has been refereed | ||||
| Created at the University of Regensburg: | Yes | ||||
| Item ID: | 42183 |
Web of ScienceAbstract
Objectives. To investigate the influence of the implant-abutment connection on the long-term in vitro performance and fracture resistance of two-piece zirconia implant systems for anterior application. Methods. Six groups of two-piece zirconia implant systems (n = 10/group) with screw-retained (5x) or bonded (1x) connections were restored with full-contour zirconia crowns. A two-piece ...
Abstract
Objectives. To investigate the influence of the implant-abutment connection on the long-term in vitro performance and fracture resistance of two-piece zirconia implant systems for anterior application. Methods. Six groups of two-piece zirconia implant systems (n = 10/group) with screw-retained (5x) or bonded (1x) connections were restored with full-contour zirconia crowns. A two-piece screw-retained titanium system served as reference. For simulating anterior loading the specimens (n = 8/group) were mounted at an angle of 135 degrees in the chewing simulator, and subjected to thermal cycling (TC: 2 x 9000 x 5 degrees/55 degrees C) and mechanical loading (ML: 3.6 x 10(6) x 100 N). Failed restorations were examined (scanning electron microscopy). Fracture resistance and maximum bending stress of surviving restorations were determined. 2 specimens per group were loaded to fracture after 24h water storage without TCML. Data were statistically analyzed (ANOVA; Bonferroni; Kaplan-Meier-Log-Rank; alpha = 0.05). Results. The bonded zirconia system and the titanium reference survived TCML without any failures. Screw-retained zirconia systems showed fractures of abutments and/or implants, partly combined with screw fracture/loosening. Failure frequency (F) varied between the groups (F = 8 x : 3 groups, F= 3 x: 1 group, F =1 x : 1 group). The Log-Rank test showed significant (p = 0.000) differences. Fracture forces and maximum bending stresses (mean +/- standard deviation) differed significantly (ANOVA: p = 0.000) between 233.4 +/- 31.4 N/317.1 +/- 42.6 N/mm(2) and 404.3 +/- 15.1 N/549.2 +/- 20.5 N/mm(2). Fracture forces after TCML were similar to 24 h fracture forces. Significance. Screw-retained two-piece zirconia implant systems showed higher failure rates and lower fracture resistance than a screw-retained titanium system, and may be appropriate for clinical anterior requirements with limitations. Failures involved the abutment/implant region around the screw, indicating that the connecting design is crucial for clinical success. (C) 2016 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
Metadata last modified: 17 Mar 2020 11:26
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