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The Effect of Shoulderless Versus Chamfer Finishing Line Designs with Different Cement Space Settings on the Marginal Fit of Monolithic Zirconia Crowns (in-vitro study) | ||
| Tikrit Journal for Dental Sciences | ||
| Volume 12, Issue 2, December 2024, Pages 463-471 PDF (488.37 K) | ||
| DOI: 10.25130/tjds.12.2.22 | ||
| Authors | ||
| Kazhan M. Omer* ; Abdulsalam R. Kudid Al-Zahawi | ||
| Department of Conservative, College of Dentistry, University of Sulaimani, Sulaimani, Iraq | ||
| Abstract | ||
| The objective was to examine the effect of various finishing line designs and modified cement space settings on the marginal fit of monolithic zirconia crown restorations. Material and methods: - Extracted sound upper first premolar tooth was prepared sequentially with two different finishing lines, a shoulderless and a chamfer. Each preparation was scanned with an intra-oral scanner. The scan data was used to create 45 milled Chrome-Cobalt (Cr-Co) alloy copies and to design crowns with two cement space settings using CAD software (Exocad version 3.1). Three groups were designed (n=15). (1) group A: shoulderless finishing line and crowns with (0 µm marginal and 35 µm occlusal-axial) cement space setting; (2) group B: shoulderless finishing line and crowns with modified cement space setting (0 µm occlusal to the 2.4 mm axial and 35 µm marginal); (3) group C: chamfer finishing line and crowns with (0 µm marginal and 35 µm occlusal-axial) cement space setting. The marginal gap was measured in microns (µm) with the impression replica technique. Data were statistically analyzed using the Student’s T-test, one-way ANOVA, and Bonferroni tests at a significance level of 0.05. Results: - The lowest mean values were recorded by group A, followed by group B, and the highest mean values were recorded by group C. The result revealed highly significant differences between groups. Conclusion: - Within this in-vitro study limits, all groups' marginal gap variables were clinically acceptable. Modifying the crown cement space setting for shoulderless preparation resulted in a larger marginal gap. | ||
| Keywords | ||
| CAD/CAM Zirconia Shoulderless finishing lin | ||
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