Abstract
(1) Background: Traditional metal-ceramic restorations are considered as a standard in the evaluation of new technologies. A critical factor in their longevity is represented by their adaptability; The purpose of this study was to evaluate the marginal and internal gap of ceramic-fused to metal crowns with frameworks obtained by additive manufacturing (AM) technologies and the influence of veneering process on their fit; (2) Methods: Metal-ceramic crowns have been produced by conventional lost-wax technology (T), digital milling (F), selective laser sintering (SLS) and selective laser melting (SLM). The adaptability was assessed using silicone replicas before and after ceramic veneering; (3) Results: The best values were obtained for the milled group followed closely by SLM and SLS, and a significantly higher gap for casted copings. The veneering process did not significantly influence the adaptability of the crowns, regardless of the manufacturing process used for frameworks. The present study promotes additive technologies (AT) as a fast, efficient, and cost-effective alternative to traditional technology. There are fewer steps in which errors can occur when digital technologies are used and the risk of distortion is diminished. (4) Conclusions: CAD/CAM technologies, both additive and subtractive, represent an excellent option to produce time-effective, precise metal-ceramic crowns with excellent adaptation.
Highlights
This research theme was chosen due to the dynamic evolution of additive manufacturing technologies and to the exponential development of new materials that can be processed through these technologies in comparison with subtractive techniques
Mean gap values were calculated for each point, for each group, before and after ceramic firing
The analysis of variance with Games–Howell post-hoc adjustment showed that the cast T group had significantly higher values, as compared to other procedures, in all point measurements, p > 0.001
Summary
This research theme was chosen due to the dynamic evolution of additive manufacturing technologies and to the exponential development of new materials that can be processed through these technologies in comparison with subtractive techniques. Metal-ceramic restorations have long been considered the gold standard for dental restorations, and they still represent the landmark for integral ceramic crowns evaluation [1,2,3]. They are preferred, especially for posterior teeth, because of their higher loading forces and the possibility to produce precise structures [3,4]. Many studies investigate the results for traditional technologies, but fewer investigated both additive and subtractive techniques, compared with traditional ones [6,7]
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