Evaluation of the Internal and Marginal Discrepancies of Co-Cr Metal Copings Prepared via CAD/CAM and Conventional Casting
European Journal of Prosthodontics and Restorative Dentistry, vol.27, no.1, pp.26-31, 2019 (Scopus)
- Publication Type: Article / Article
- Volume: 27 Issue: 1
- Publication Date: 2019
- Doi Number: 10.1922/ejprd_01865dayan06
- Journal Name: European Journal of Prosthodontics and Restorative Dentistry
- Journal Indexes: Scopus
- Page Numbers: pp.26-31
- Keywords: Alloys, Computer-Aided Design, Computer-Aided Manufacture, Internal Discrepancy, Marginal Discrepancy
- Trakya University Affiliated: Yes
Abstract
The aim of this study was to assess the internal and marginal discrepancies of chromium- cobalt (Co/Cr) copings fabricated using different techniques. A typodont molar tooth was prepared and replicated in die stone and scanned. Forty Co-Cr alloy copings were produced using four different production techniques: conventional casting (Cgroup), direct metal laser sintering (DMLS-group), micro-stereolithography/casting combination (μSLA-group), and computer-aided milling (M-group) (n = 10). The internal and marginal discrepancies at various reference points were determined via digital microscopy. Analysis of variance (ANOVA) and Tukey’s multiple comparisons tests were used for statistical analysis (p=0.05). The marginal and cervical discrepancies of the C-group were similar to those of the M-group (p>0.05) and better than those of the μSLA-group (p<0.05). The marginal and internal discrepancies of all groups were within clinically acceptable limits, but further improvements in the μSLA and DMLS techniques may be required prior to clinical implementation.