Abstract: Objective To assess the effects of different surface treatments on the bonding strength between titanium and resin cements. Methods A total of 56 commercially pure grade Ⅱ titanium specimens (?=10 mm, h=3 mm) were manufactured by CAD/CAM and randomly separated into 7 groups (n=8）. Then different surface treatments were applied: control group without any surface treatment (Group A), sandblasting by 50 μm Al2O3 particles (Group B) , application of coupling agents (Group C), application of metal primer (Group D), sandblasting by 50 μm Al2O3 particles and application of coupling agents (Group E), sandblasting by 50 μm Al2O3 particles and application of metal primer (Group F), sandblasting by 50 μm Al2O3 particles and application of coupling agents + metal primer (Group G). Thereafter, the shear bond strength (SBS) and failure mode were tested and analyzed. The data were analyzed statistically by one-way ANOVA and Tukey HSD（?=0.05). Results The results showed that all the experimental groups had higher SBS values when compared to the control group, while group F showed the highest SBS, (20.9±4.3) MPa, and had no statistical difference with group G (P<0.05). But there were significant differences between groups F, G and other groups, groups B, D and groups A, C. The interfacial failure mode and mixed failure mode were observed in all the experimental groups. Conclusion Proper surface treatments are beneficial to increasing the bonding strength, especially when the combination of mechanical and chemical surface treatments is applied.

Key words: titanium, resin, bonding strength, surface treatment