| Dokumentenart: | Artikel | ||||
|---|---|---|---|---|---|
| Titel eines Journals oder einer Zeitschrift: | Dental Materials | ||||
| Verlag: | Elsevier | ||||
| Ort der Veröffentlichung: | OXFORD | ||||
| Band: | 32 | ||||
| Nummer des Zeitschriftenheftes oder des Kapitels: | 6 | ||||
| Seitenbereich: | S. 765-774 | ||||
| Datum: | 2016 | ||||
| Institutionen: | Medizin > Lehrstuhl für Zahnärztliche Prothetik | ||||
| Identifikationsnummer: |
| ||||
| Stichwörter / 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-Dezimal-Klassifikation: | 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin | ||||
| Status: | Veröffentlicht | ||||
| Begutachtet: | Ja, diese Version wurde begutachtet | ||||
| An der Universität Regensburg entstanden: | Ja | ||||
| Dokumenten-ID: | 42183 |
Web of ScienceZusammenfassung
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 ...
Zusammenfassung
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.
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