Objective: The objective of this in-vitro study was to investigate the bond strength of two ceramics bonded to yttria-stabilized tetragonal zirconia (Y-TZP) framework. Method: Twenty-four Y-TZP frameworks (25x3x0.5 mm) were fabricated by a CAM-aided system (Cercon smart ceramics, Degudent) and divided into four groups. In two groups, the surfaces of the Y-TZP frameworks were polished with 600grit SiC paper. The framework surface was sandblasted with 100 µ m alumina particles. Two types of ceramics specially developed for zirconium oxide, Cercon Ceram S (Degudent) and Cerabien ZR (Noritake) were applied and adjusted to a final thickness of 1.5mm including the Y-TZP frameworks according to DIN 13 927. The specimens were subjected to a three-point bending test using a universal testing machine (1123 Instron). The data (mean±SD, MPa) were analyzed by one-way ANOVA and Tukey HSD test (p<0.05). Results: The surface roughness of the Y-TZP frameworks with and without polishing with 600grit SiC paper were Ra 2.82±0.576µ m and Ra 0.720±0.142µ m respectively. The bond strengths of Cercon Ceram S and Cerabien ZR to Y-TZP frameworks (without polishing) were 40.1±8.7 and 27.5±3.4MPa respectively. The bond strengths of Cercon Ceram S and Cerabien ZR to Y-TZP frameworks polished with 600grit SiC paper were 45.2±8.7 and 30.6±3.6MPa respectively. There were significant differences between Cercon Ceram S and Cerabien ZR (p<0.05). Conclusion: The results showed that Cercon Ceram S and Cerabien ZR were suitable ceramics for Y-TZP.

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