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Aim: This study was carried out to evaluate the effect of two types of surface treatments; Sandblasting (Al2O3 110 m) and Zirconia primer (Z-Prime Plus) applicaition on zirconia-resin cement shear bond strength. Materials and Methods: 28 zirconia discs were specially constructed for this study by CAD-CAM machine of dimensions 10 mm diameter and 5 mm thickness. The discs were divided into two groups according to sandblasting surface treatment as the following: Group (I):14 zirconia discs without sandblasting and Group (II):14 zirconia discs after being subjected to sandblasting. These groups are subdivided into two subgroups each according to Z-Primer Plus application. Subgroup A: 7 zirconia discs without primer application and Subgroup B: 7 zirconia discs with primer application. Sandblasting was carried out to fourteen zirconia discs using 110 μm(Al2O3). Zirconia Primer (Z Primer Plus) was applied to 14 zirconia discs.28 composite discs were fabricated according to manufacturer’s instructions with dimensions 5mm diameter and 2.5mm thickness. Cyclic loading was done by 10,000 Cycle, frequency 1.6 Hz, Torque; 2.4 Nm and Weight 3 kg (30 N) and also thermocycling was done, at5oC and 55oC and number of cycles is 500 cycles. Testing shear bond strength was done for all samples using universal testing machine.Results: It was found that the highest shear bond strength mean value recorded for group (IIB) followed by group (IB) then group (IIA) while the lowest mean value recorded for group (IA) The difference between different surface treatment groups was statistically significant as revealed with one way ANOVA test (p 0.05) differences between {(IIB) and (IB)}, {(IB)and (IIA)} and {(IIA) and (IA) }.It was noted that during thermo-mechanical aging a total loss of two samples in group (IIA) and only one sample in group (IA) and their results recorded as zero so not indicated in mean value calculation. Conclusions: The bonding to zirconia is affected by mechanical and chemical surface treatments which are sandblasting and primer application.

Effect of Sandblasting and Zirconia Primer Application on The Zirconia-Cement Shear Bond Strength (An in-vitro Study)