冷热循环对不同金属与树脂粘接剂粘接强度的影响

目的：冷热循环对不同金属与树脂粘接剂粘接强度的影响。方法：铸造直径分别为4mm和5mm的镍铬合金和纯钛，切割成长度为3mm的标本。2种规格的同种金属标本配对，金属表面经50μmAlzO3喷砂，涂布Al—loy Primer，使用Super—BondC＆B和PanaviaF2种粘接剂粘接。固化后经37℃恒温水浴24h以及10000次冷热循环，测试剪切粘接强度。用spssl7．0统计软件进行统计分析。结果：10000次冷热循环后，镍铬合金与Super—BondC＆B、纯钛与PanaviaF粘接强度显著提高（P〈O．01），其余各组没有统计学差异。结论：粘接剂的种类对冷热循环前后的粘接强度没有明显影响，金属的种类对冷热循环前后的粘接强度没有明显影响，但是不同金属和不同粘接剂的配伍组合在冷热循环前后的粘接强度变化有统计学意义。

Effect of Thermocycling on the Shear Bond Strength between Dental Metals and Resin Cements

Objective: To study the effect of thermocycling on the shear bond strength between dental metals and resin cements.Methods: Two sizes of NiCr alloy and pure titanium specimens were fabricated by casting.Then the surface were airborne-particle abraded with 50-μm aluminum oxide and then were primed with Alloy Primer.Then they were bonded in pairs with Super-Bond C&B or Panavia F.The specimens were then stored in distilled water(37℃) for 24h.Shear bond strengths were determined before and after 10000 thermocycling.Mean bond strength values were analyzed using 2-way ANOVA(α=0.05).Results: After 10000 thermocyles,the shear bond strength between the NiCr alloy and Super-Bond C&B increased significantly(P<0.01),that of pure titanium and Panavia F also increased.The other groups had no significant.Conclusion: The type of the resin cements or the type of the alloys does not affect the shear bond strength before or after thermocycling significantly.The combination of different dental alloys and resin cements affects the shear bond strength before or after thermocycling significantly.