Effect of Surface Treatment and Resin Cement on Microtensile Bond Strength of Zirconia to Dentin

To evaluate the effect of three surface treatments and two resin cements on microtensile bond strength of zirconia to dentin. Sixty human molars were embedded in acrylic resin and sectioned 3 mm below the occlusal plane. Teeth specimens and sixty zirconia specimens were randomized into 3 groups according to the following surface treatments (n=20): no treatment (control), sandblasting and silane application (SB+ SI), sandblasting then silica coating and silane application (SB+ SC+ SI). In each group, half of the ceramic-tooth assemblies were cemented with Panavia (TM) F (Kurary Dental), the rest with RelyX Unicem (3M ESPE). All specimens were cut into microtensile sticks that were loaded in tension until failure. Data were analyzed using two-way ANOVA and Tukey's HSD test (alpha=0.05). The SB+SC+SC group presented higher values than SB+ SI and the control group (P< 0.05). Bond strength in Panavia (TM) F groups were significantly higher than those in RelyX Unicem regardless of the surface treatment (P< 0.05). Data indicated that both surface treatment and resin cement have significant effects on bond strength of zirconia to dentin.