Influence of Preparation Design on Fracture Resistance of Hybrid Ceramics Occlusal Veneer | ||||
| Egyptian Dental Journal | ||||
| Volume 70, Issue 2 - Serial Number 4, April 2024, Page 1421-1430 PDF (897.44 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/edj.2023.252351.2809 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Ahmed Kamal Mohamed   1; mohamed gamal Hussein 2; Moustafa Sherief Mohamed 2; Cherif Adel Mohsen 3
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| 1Demonstrator of Fixed prosthodontics, Faculty of Dentistry, Badr University at Assiut, Egypt | ||||
| 2Lecturer of Fixed Prosthodontics, Faculty of Dentistry, Assiut University, Egypt. | ||||
| 3Professor of Fixed Prosthodontics, Faculty of Dentistry, Minia University, Egypt. | ||||
| Abstract | ||||
| Objective: To assess the fracture load of lithium silicate occlusal veneers reinforced with zirconia at two thicknesses of 0.3 and 0.6 mm, luted to either dentin or enamel, in vitro. Materials and methods: Forty human maxillary premolars were randomly distributed into four groups (n = 10): Veneers that are E1-0.3 mm thick, E2-0.6 mm thick, D1-0.3 mm thick, and D2-0.6 mm thick are luted to enamel, dentin, and dentin, respectively. Following the luting processes, the specimens were heated for 5000 thermal cycles (5ºC/55ºC, 1 min dwell period, and 10-second interval) and then submerged in distilled water at 37°C for 7 days. A fracture load test was performed on the specimens in a universal testing apparatus. A one-way ANOVA test along with a post-hoc analysis test was employed to examine the variation in means among many groups. A p-value less than 0.05 was considered significant. Results: P < 0.05 indicated that just the thickness component was significant. Fracture load values: E1 (1436.4N ± 242.1); E2 (1119.1N ± 213.9); D1 (1593.6N ± 285.3); and D2 (1237.6N ± 205.5). | ||||
| Keywords | ||||
| Zirconia; CAD/CAM; dentin; enamel; fracture load | ||||
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