Abstract:

Objective To evaluate the effect of different silane couplers on bond strength and durability of two machinable glass ceramics to resin cement. Methods Two machinable glass ceramics（A and B） were silanized by three silane couplers（A, B, C）, and were bonded with a resin cement（G-CEM） to form micro-shear test specimens of six groups. The specimens of each group were subdivided into two subgroups, and their micro-shear bond strength was measured before and after 10 000 thermal cycles. Bond strength data were analyzed by two-way ANOVA. Results Before thermal cycles, the bond strength of ceramic A treated by silane coupler A was lower than that of ceramic B （P=0.002）. The bond strength of ceramic A treated by silane coupler C was significantly higher than that treated by silane coupler A and B（P=0.014, P=0.019）. 10 000 thermal cycles obviously decreased the bond strength of all groups except the group of ceramic A treated by silane coupler B, and no significant difference was found between three silane coupler with either of two ceramic. However the bond strength of ceramic B treated by silane coupler B and C was significantly higher than that of ceramic A（P=0.003, P=0.027）. Conclusion As well as the types of silane coupler, the type of ceramic could affect their bond strength and durability to resin cement.

Key words: glass ceramic, silane coupler, bond strength, bond durability