酸蚀时间对牙颈部非龋性硬化牙本质粘接界面形态的影响

目的:观察酸蚀时间对牙颈部非龋性硬化牙本质-树脂粘接界面超微结构的影响.方法:将20个拔除的具有典型牙颈部楔状缺损的前磨牙随机分为两组,使用全酸蚀粘接系统Scotchbond Multi-Purpose Plus处理硬化牙本质表面,酸蚀时间分别为15 s和30 s,并用树脂修复缺损.用扫描电镜观察并比较两组粘接界面的超微结构.结果:15 s组粘接界面可见混合层,牙本质小管内的树脂突短小.30 s组树脂突增多并出现管周牙本质的混合层.结论:牙颈部非龋性硬化牙本质的粘接过程中,适度延长酸蚀时间可以形成更理想的牙本质-树脂界面结构,因此可能成为改善牙颈部非龋性硬化牙本质粘接效果的有效途径之一.

Effect of acid etching time on bonding interface of non-carious cervical sclerotic dentin

Objective:To examine the effect of acid etching time on the bonding interface of non-carious cervical sclerotic dentin. Methods: Twenty extracted premolars with non-carious cervical lesions were randomly divided into two groups, the lesion surface was conditioned with Scotchbond Multi-Purpose Plus dentin bonding system. The etching time was 15 s and 30 s respectively. The bonding interface ultra-structures were compared with SEM. Results:In sclerotic dentin (15 s) , the hybrid layer was visible, with minimal resin tags in the dentinal tubules and, when presented, they were shorter. Doubling the etching time (30s) resulted in more resin tags with an hybrid layer formation on peritubular dentin. Conclusion: Doubling the etching time improved the ultrastructure of sclerotic dentin-resin bonding interface, and could be an efficient way to improve the bonding effect.