Comparison of Marginal and Internal Adaptation of Cad/Cam and Conventional Cement Retained Implant-Supported Single Crowns Publisher Pubmed

Summary: Research suggests CAD/CAM dental crowns fit better at the edges than traditional ones, potentially improving implant success and comfort. #DentalHealth #ImplantDentistry

Nejatidanesh F¹ ; Shakibamehr AH² ; Savabi O³
Source: Implant Dentistry Published:2016

Abstract

Purpose: To evaluate the accuracy of marginal and internal adaptation of 2 computer-aided design/computer-aided manufacturing (CAD/CAM) and 2 conventionally made cement retained implant-supported restorations. Materials and Methods: An abutment and its corresponding fixture analog (Astra Tech) were inserted in left central incisor area of a maxillary cast. Four types of implant-supported single restorations were fabricated on the abutment (n 10): e.max CAD (Cerec AC system), zirconia-based (Cercon system), IPS e.max Press, and metal-ceramic restorations. The internal and marginal gaps of the studied groups were measured by replica method and stereomicroscope. Data were subjected to 1-way ANOVA and Scheffe post hoc tests (α 0.05). Results: Mean internal gaps of Cercon (59.48 ± 16.49 m) and e.max Press (75.62 ± 26.92 m) groups were significantly different from e.max CAD (120.29 ± 16.74 m) group, but there was no significant difference between metal-ceramic restorations (89.65 ± 47.84 m) and e.max CAD. The marginal gaps of e.max CAD (32.02 ± 10.38 m) and Cercon restorations (34.26 ± 11.41 m) were significantly superior from metal ceramics (59.19 ± 17.81 m) and e.max press (74.99 ± 24.51 m). Conclusion: Within the limitations of this study, it can be concluded that although the marginal and internal gaps of the studied implant-supported restorations were in the clinically acceptable range, single crowns made with CAD/CAM technology provide better marginal fit. © 2015 Wolters Kluwer Health, Inc.