The Influence of Finish-Line Curvature and Scanning Methods on the Marginal Fit of CAD/CAM Ceramic Crowns: An in-vitro study

Document Type : Original Article

Authors

1 Demonstrator, Crown and Bridge Department, Faculty of Dental Medicine, Boys, Cairo, Al-Azhar University.

2 Lecturer, Crown and Bridge Department, Faculty of Dental Medicine, Boys, Cairo, Al-Azhar University.

3 Professor, Crown and Bridge Department, Faculty of Dental Medicine, Boys, Cairo, Al-Azhar University.

Abstract

Aim of the study: the purpose of this study was to evaluate the influence of finish line curvature and scanning methods on the marginal gap of CAD/CAM Ceramic crowns. Methodology: Forty-two crowns were fabricated from Vita mark II blocks using Cerec in Lab system, and divided into two main groups (21 each) according to the scanning method (direct and indirect scanning). Each group was divided into three subgroups (7 each) according to finish line curvature (1mm, 3mm, and 5mm). Optical impressions for direct group were taken for the dies directly using the Cerec scanner, but for indirect group; physical impression was taken for the dies then poured in stone which scanned by using the Cerec scanner. The completed crowns were cemented to the corresponding dies and the marginal gap was evaluated. The collected data was statistically analyzed using two-way ANOVA test and Post Hoc test and the significance level was set at p ≤ 0.05. There was no statistically significant difference (p ≤ 0.05) between subgroups of (1mm) and (3mm) curvature but there was statistically significant difference (p ≤ 0.05) between both subgroups of (1mm and 3mm) curvature and subgroup of (5mm) curvature. Conclusion: Finish line curvature more than 3mm has an effect on the marginal gap of Vita Mark II crowns. \

Files

Share

How to cite

Statistics