Marginal Accuracy of Monolithic Zirconia Crowns with Vertical and Horizontal Margin Configurations after Thermomechanical Fatigue | ||||
| Al-Azhar Journal of Dentistry | ||||
| Volume 2022, Issue 1, January 2022 | ||||
| DOI: 10.21608/adjg.2021.63755.1340 | ||||
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| Authors | ||||
| Reham Almahdy1; Mona Mandour2; Zainab El Sharkawy3 | ||||
| 1Dentist at Egyptian Ministry of Health, Egypt | ||||
| 2Professor of Crown and Bridge, Faculty of Dental Medicine for girls, Al-Azhar University, Cairo, Egypt | ||||
| 3Assistant professor of Crown and Bridge, Faculty of Dental Medicine for girls, Al-Azhar University, Cairo, Egypt | ||||
| Abstract | ||||
| Purpose: The aim of this study was to evaluate the effect of two types of finish line designs on the marginal accuracy of monolithic zirconia crowns after thermo-mechanical fatigue. Materials and Methods: two human first molars were prepared and duplicated using epoxy resin to produce twenty dies. Accordingly, a total of 20 monolithic zirconia crowns (N=20) were designed and constructed using CAD/ CAM machine. The crowns were divided into two groups according to the finish line design, feather edge (FE) group (n=10) and deep chamfer (DC) group (n=10). All crowns were adhesively bonded to their corresponding epoxy resin dies by using dual cure self-adhesive resin cement and subjected to thermo-mechanical fatigue simulating 3 months of clinical situations then vertical marginal gap was measured using digital microscope. Results: Statistical analysis showed that deep chamfer margin design recorded statistically significant higher marginal gap mean value (39.6383 ± 5.00193 μm) than feather edge design (32.2616 ± 2.60053μm). Conclusion: marginal accuracy of monolithic zirconia constructed with feather edge margins is better than that with deep chamfer margin designs | ||||
| Keywords | ||||
| Zirconia Crowns; marginal accuracy; finish line; monolithic | ||||
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