Resin composite repair for implant‐supported crowns

This study evaluated the reliability of implant- supported crowns repaired with resin composites. Fifty-four titanium abutments were divided in three groups (n 5 18 each) to support resin nanoceramic molar crowns, as fol- lows: (LU) (Lava Ultimate, 3M ESPE); LU repaired with either a direct or an indirect resin composite. Samples were sub- jected to mouth-motion accelerated-life testing in water (n 5 18). Cumulative damage with a use stress of 300 N was used to plot Weibull curves for group comparison. Reliabil- ity was calculated for a mission of 100,000 cycles at 400 N load. Beta values were 0.83 for LU, 0.31 and 0.27 for LU repaired with Filtek and Ceramage, respectively. Weibull modulus for LU was 9.5 and g 5 1047 N, m 5 6.85, and g 5 1002 N for LU repaired with Ceramage, and m 5 4.65 and g 5 766 N for LU repaired with Filtek (p < 0.10 between LU and LU repaired with Filtek). Reliability at 400 N was 100% for both LU and LU repaired with Ceramage which were significantly higher than LU Filtek repair (32%). LU restored crowns failed cohesively. Fractures were confined within the restored material, and detailed fractography is presented. The performance of resin nanoceramic material repaired with an indirect composite was maintained after accelerated-life testing compared to unrepaired controls. V C 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 00B: 000-000, 2016.