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- 2017
Er:YAG激光预备对牙釉质表面性能及树脂粘结强度的影响
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Abstract:
摘要 目的:探讨Er:YAG激光预备对牙釉质表面性能及树脂粘结强度的影响。方法:选取50颗无龋坏、无充填物的人离体前磨牙或磨牙,用涡轮手机按近远中方向将离体牙切割成颊/舌两部分,最终选取84个样件,按不同的表面处理方法随机分为7组(A-G组),每组12个样件。每组2个样件扫描电镜观察,其余10个样件分别在处理后的牙釉质表面粘结光固化复合树脂,进行剪切强度测试。结果:A组剪切强度最高(20.51±3.33) MPa。B、C、D组剪切强度次之,与A组比差异无统计学意义。E、F、G组剪切强度较弱,其中E组剪切强度与B、C、D组无显著差异,F、G组与其他组有显著差异。扫描电镜观察:随着激光能量的增加,牙釉质表面粗糙度增加。激光处理后再进行酸蚀处理,牙釉质表面整体结构均匀,釉柱结构清晰可见,无玷污层。结论:Er:YAG激光处理牙釉质表面不能达到类似酸蚀的效果。激光加酸蚀能达到类似酸蚀的效果。牙釉质剪切粘结强度随着激光能量的增加而增加。 [关键词] Er:YAG激光 酸蚀 牙釉质 剪切粘结强
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