Tukey's test showed that restorations of the KE 150-150-300 group can withstand a load significantly higher than that of other groups (p<0.01). Two-way ANOVA revealed statistically significant differences between pairs of means (p<0.05).
The fracture values, ordered from least to most resistant, were: KE 150-50-300 group, CHA 150-50-0 group, KE 150-50-0 group and KE 150-150-300 group. The level of significance was set at P=0.05. Differences in means were compared using two-way ANOVA and a post-hoc test (Tukey Test). The crowns were loaded before cementation by using an Instron machine to simulate the masticatory load applied during a trial. The groups differed in type of preparation (knife-edge (KE) or chamfer (CHA)) and spacing parameters: spacer (0 or 150μm), marginal adhesive gap (10 or 50 or 150μm) and margin thickness (0 or 300μm). Fifteen full crowns were manufactured for four groups using CEREC. The teeth were scanned and two Co-Cr alloy replicas were made.
To evaluate the influence of the preparation design and spacing parameters on the risk of chipping of crowns made by CEREC Bluecam before cementation.Ī knife-edge preparation and a chamfer preparation were made on upper premolars.
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