Effect of Different Surface Treatments on Bond Strength to Tetragonal and Cubic Zirconia

Background: Dental zirconia has been widely used due to its superior mechanical properties. However, traditional etching techniques and surface treatments are generally ineffective on zirconia surfaces due to its inertness and lack of a silica phase. Hence, various surface treatments are applied to improve bonding to zirconia. Objectives: The aim of this study was to evaluate the effect of three different surface treatments: low pressure air borne particle abrasion, selective infiltration etching and fusion sputtering on bond strength to both Tetragonal zirconia and Cubic zirconia. Materials and Methods: Ninety two specimens of zirconia were used in this study. Two of the specimens were investigated for surface analysis and ninety specimens was divided into 2 groups according to type of zirconia used cubic zirconia (Bruxir anterior) and tetragonal zirconia (Cercon), specimens of each group will be divided into 3 subgroups according to type of surface treatments low pressure airborne-particle abrasion, selective infiltration etching and fusion sputtering, then will be divided into 3 divisions according to time interval as immediate, thermocycling and water storage. Results: Statistical analysis of data revealed significant differences in surface treatments on shear bond strength (F=124, P Conclusion: Within limitations of this study, Selective infiltration etching produced the highest shear bond strength compared to other surface treatment. Selective infiltration etching is a promising surface treatment for both cubic and tetragonal zirconia. Both thermocycling and water storage significantly affected the shear bond strength of both cubic and tetragonal zirconia