effect of different surface treatments and pressure conditions on shear bond strength of zirconia ceramic to composite resin

Objectives: the aim of this study was to assess the shear bond strength (sbs) of zirconia ceramic to composite resin with various surface treatments following pressure changes. materials and methods: totally, 135 zirconia blocks were prepared by computer-aided design/computer-aided manufacturing technology. the samples were divided into 9 groups (n=15). three surface treatments including sandblasting, tribo-chemical preparation, and laser application were used. for each method, 45 samples were considered and tested under different pressure conditions. z-prime plus primer was used for bonding of all samples to composite cylinders. all specimens were stored in water for 24 h, underwent thermocycling, and were then placed in a pressure chamber under normal-, high-, and low-pressure conditions. then, the sbs test was performed for each sample. data were analyzed by two-way and one-way anova (α=0.05). results: the sbs was significantly higher in sandblasting and tribochemical preparation compared with laser irradiation (p<0.05). there was no statistically significant difference in sbs of sandblasting and tribochemical preparation methods (p>0.05). sandblasting, tribochemical preparation, and laser methods did not show a significant difference in sbs at different pressures (p>0.05). conclusion: sandblasting and tribochemical preparation yielded a higher sbs than laser. different pressures had no effect on sbs, irrespective of surface preparation method.