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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).
Mohamed et al. (2024) studied this question.