两种正畸粘接系统对金属和陶瓷托槽粘接强度的影响

目的:评价传统正畸粘接系统和自酸蚀粘接系统分别对金属托槽和陶瓷托槽的粘接强度。方法:将100颗人前磨牙均分为4组:金属托槽/传统粘接系统组(1组)、金属托槽/自酸蚀粘接系统组(2组)、陶瓷托槽/传统粘接系统组(3组)、陶瓷托槽/自酸蚀粘接系统组(4组),使用Transbond XT树脂糊剂将托槽粘接在牙面上,测量各组的抗剪切粘接强度,并评价其剩余粘接剂指数,对结果进行单因素方差分析。结果:统计学分析表明金属托槽的抗剪切粘接强度高于陶瓷托槽,其差异具有统计学意义(P<0.05);1组和2组平均抗剪切粘接强度的差异无统计学意义(P>0.05),3组和4组间的差异也无统计学意义(P>0.05);各组剩余粘接剂指数的差异无统计学意义(P>0.05),但各组的粘接强度与剩余粘接剂指数有平行相关性(P<0.05)。结论:金属托槽的粘接强度高于陶瓷托槽;自酸蚀粘接系统与传统粘接系统都可满足正畸临床粘接托槽的需求;大部分样本的粘接失败发生在托槽/粘接剂界面或粘接剂内部破坏,表明牙釉质受损的几率较低,且粘接强度和剩余粘接剂指数之间存在统计学相关性。

Effects of two orthodontic adhesive systems on the bond strength of metallic and ceramic brackets

Objective： The aim of this in vitro study was to investigate the effects of two orthodontic adhesive systems on the bond strength of metallic and ceramic brackets. Method： One hundred premolars were divided into four groups： metallic brackets / conventional adhesive; metallic brackets / self-etching adhesive; ceramic brackets/conventional adhesive; and ceramic brackets/self-etching adhesive. Bonding shearing force was applied to the bracket-tooth interface. Scoring of bonding failure site was done using the adhesive remnant index （ARI）. Result： Both self-etching adhesive system and conventional system produces clinically acceptable bond strengths. There is a statistically significant relationship between bond strength changes and ARI changes. Conclusion：There is a positive correlation between shearing bond strength and ARI. The bond strengths of metallic brackets were significantly higher than the ceramic. The self-etching adhesive produces clinically acceptable bonds in comparison with the conventional system.