![]() ![]() With regard to the cohesive strength (σc), ZP1 presented the highest values. The predominant failure mode for the bonded specimens was cohesive. The ZP1 group presented the highest values for σa data, compared with other groups, which were statistically similar. The data were analyzed by Kruskal-Wallis and Dunn's tests (α = 0.05) or ANOVA and Tukey's test (α = 0.05), according to their distribution parameters. The failure mode was classified as cohesive (used to calculate the cohesive strength, σc) or adhesive (bond strength, σa). We calculated strength (σ, in MPa) by dividing the fracture load (N) by the fractured area (mm2). The specimens were cut into 1 mm2 microbars and tested under tension in a universal testing machine (0.5 mm/min). ![]() All study specimens were sintered three times. ![]() Ten specimens with V9 were prepared following the same protocols of groups 1 (P1) and 3 (P3). The feldspathic porcelain (V9) was applied to the zirconia in different numbers of layers up to 1 cm total thickness (n = 10): ZP1 - one layer ZP2 - two layers ZP3 - three layers. Y-TZP blocks were cut into 1 cm3 specimens (n = 30). To evaluate the influence of the number of porcelain layers on its cohesive strength and on bonding to zirconia. ![]()
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