Article ID: JPR_D_25_00149
Purpose: This study retrospectively investigated the clinical outcomes of computer-aided design/computer-aided manufacturing (CAD-CAM) resin composite crowns for molars and analyzed the morphological factors contributing to crown failure using three-dimensional (3D) digital data.
Methods: The clinical outcomes of 117 crowns in 101 patients treated at Osaka University Dental Hospital were analyzed. 3D digital data were evaluated to identify factors influencing crown debonding, focusing on luting methods, abutment morphology, and crown parameters. Survival analyses, multivariate analyses, and regression modeling were performed.
Results: During an observation period of up to 1281 days, the cumulative success and survival rates were 83.3% and 95.5%, respectively. Debonding (12.0%) was the most frequent complication and was significantly associated with the choice of luting materials (P < 0.001). In addition, 3D analysis identified greater buccolingual taper, insufficient occlusal thickness, smaller abutment surface area, and reduced abutment height as predictors of debonding. Nonlinear regression analysis revealed significant differences in the abutment parameters between SA Luting and PANAVIA V5 at the lower percentiles (P = 0.02).
Conclusions: Combining clinical outcomes with 3D data highlights the importance of precise abutment preparation and material selection to reduce the risk of crown debonding.
