Comparison of shear bond strength between zirconia ceramics and three resin luting cements

Objective To study the bonding strength of zirconia ceramics with three kinds of luting cement materials.Methods Blocks of sintered zirconia ceramics were cut and randomly divided into three groups with 32 slices in each. After being treated with sandblasting, they were bonded with three kinds of luting cements respectively. After preserved in 37℃ distilled water for 24 hours and 30 days, the shear bonding strength of these specimens was tested and the data were analyzed with SAS9.12 software package and the bond sections were observed under scanning electron microscope.Results Two-way ANOVA revealed that the group of PanaviaTMF could attain the best shear bonding strength: (31.36±3.49) MPa (after 24 hours) and (29.52±3.44) MPa (after 1 month). Superbond C﹠B had the high initial shear bond strength (31.85±3.61) MPa (after 24 hours) but low long-term bond strength (21.32±2.58) MPa (after 1month). The one-step self erosion adhesive RelyX Unicem was proved to have the lowest initial bond strength (13.29±3.05) MPa (after 24 hours), but the strength could last longer.Conclusion Resin luting cement containing phosphate monomer (MDP) can provide zirconia ceramics a strong and long-lasting bonding. The cement without inorganic filler can get good bonding strength too, but can't last long.