TY - JOUR T1 - Laboratory performance and fracture resistance of CAD/CAM implant-supported tooth-coloured anterior FDPs. AU - Zacher,Julian, AU - Bauer,Robert, AU - Strasser,Thomas, AU - Rosentritt,Martin, Y1 - 2020/03/20/ PY - 2019/11/20/received PY - 2020/03/05/revised PY - 2020/03/18/accepted PY - 2020/3/24/pubmed PY - 2020/11/21/medline PY - 2020/3/24/entrez KW - CAD/CAM KW - Composite KW - Implant KW - Lithiumdisilicate KW - TCML KW - Zirconia SP - 103326 EP - 103326 JF - Journal of dentistry JO - J Dent VL - 96 N2 - 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; post-hoc-Bonferroni, α = 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. SN - 1879-176X UR - https://www.unboundmedicine.com/medline/citation/32201200/Laboratory_performance_and_fracture_resistance_of_CAD/CAM_implant_supported_tooth_coloured_anterior_FDPs_ DB - PRIME DP - Unbound Medicine ER -