The comparative research on resin bond strength and durability of two machinable glass ceramic / 华西口腔医学杂志

ABSTRACT

<p><b>OBJECTIVE</b>To evaluate the effect of different silane couplers on bond strength and durability of two machinable glass ceramics to resin cement.</p><p><b>METHODS</b>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 10000 thermal cycles. Bond strength data were analyzed by two-way ANOVA.</p><p><b>RESULTS</b>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).</p><p><b>CONCLUSION</b>As well as the types of silane coupler, the type of ceramic could affect their bond strength and durability to resin cement.</p>