Zacher, Julian and Bauer, Robert and Strasser, Thomas and Rosentritt, Martin (2020) Laboratory performance and fracture resistance of CAD/CAM implant-supported tooth-coloured anterior FDPs. JOURNAL OF DENTISTRY, 96: 103326. ISSN 0300-5712, 1879-176X
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Objectives: This study investigated the in-vitro performance and fracture force of anterior implant-supported tooth-coloured fixed dental prosthesis (FDPs). Different material types with varying flexural strength and modulus of elasticity were compared with screw-retained or bonded application. Materials and methods: Identical anterior FDPs (tooth 11-13; n = 80) from materials (flexural strength 240-1150 MPa, modulus 7.6-210 GPa; 1x lithiumdisilicate ceramic, 2x zirconia (4Y-TZP, 5Y-FSZ), 3x resin-Based composites (with different flexural strength and modulus)) were milled. FDPs were grouped into chairside (bonded) and labside (screw-retained) procedure. To simulate a 5-year clinical application, thermal cycling with mechanical loading (TCML) was accomplished. TCML-performance and fracture force were evaluated and failure patterns were analysed. Data were statistically investigated (Kolmogorov-Smirnov-test, one-way-ANOVA; posthoc-Bonferroni, alpha = 0.05). Results: TCML did not lead to any cracks, fractures or chipping on all tested FDPs. Fracture values varied between 1208.9 +/- 354.6 N (experimental resin-based composite) and 2094.3 +/- 293.4 N (4Y-TZP) for FDPs without screw channel. With screw channel the results ranged between 1297.9 +/- 268.3 N (5Y-FSZ) and 2129.3 +/- 321.7 N (4Y-TZP). The influence of the screw channel was not significant for all materials (p >= 0.218). Modulus of elasticity and flexural strength had influence on the fracture force only in the individual material groups. Fractures at the connector were predominant for ceramic and zirconia. Resin-based composites primarily showed radial fractures in abutment region or mixed failure types. FDPs with/without screw-channel showed comparable types of failure. Conclusions: TCML did not lead to drop-outs or failures for all FDPs. Individual materials showed no different in-vitro performance, but varying fracture force after TCML. Independent from material, screw channels did not weaken the FDPs. All tested systems showed sufficient properties for an anterior implant application.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | IN-VITRO PERFORMANCE; LITHIUM-DISILICATE CROWNS; FIXED DENTAL PROSTHESES; SINGLE CROWNS; SURVIVAL; ZIRCONIA; CEMENT; STRENGTH; CAD/CAM; Zirconia; Lithiumdisilicate; CML; Implant; Composite |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Zahnärztliche Prothetik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 26 Mar 2021 07:42 |
| Last Modified: | 26 Mar 2021 07:42 |
| URI: | https://pred.uni-regensburg.de/id/eprint/44655 |
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