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Purpose: The current study was aimed to assess the effect of various surface treatments: liner, silica coating and laser treatment, and veneering technique on the zirconia veneering ceramic sheer bond strength. Materials and Methods: Sixty four zirconia discs were prepared from Y-TZP ceramic blocks. According to surface treatment, the discs were divided into four groups (n=16); Group I: Control (without any treatment), Group II: liner application, Group III: silica coating, Group IV: laser irradiation. Then they sub grouped into subgroup A (n=8): layering technique and subgroup B (n=8): press–on technique according to the used veneering technique. Two additional specimens from every group were inspected by scanning electron microscope. To stimulate the thermal changes all samples were thermocycled for 1500 cycles. Shear test was done using a universal testing machine. Results: The highest mean sheer bond strength value was noted in the laser group and the control group showed the lowest in case of veneering by layering. While in case of press-on veneering sub group the lowest mean sheer strength value was recorded in the liner. Conclusions: surface treatments and veneering technique had an effect on the zirconia-veneer sheer bond strength.

Effect of Surface Treatment and Veneering Method on the Shear Bond Strength between Zirconia and Veneering Ceramics