Gazi University Faculty of Dentistry, Operative Dentistry and Endodontics, Ankara, Turkey.
Oper Dent. 2011 Mar-Apr;36(2):153-61. doi: 10.2341/09-381-L.
The aim of this in vitro study was to evaluate the effect of cervical hypersensitivity treatments (neodymium yttrium aluminum garnet [Nd:YAG] laser and conventional techniques) on the microtensile bond strengths of adhesives to treated dentin. The buccal cervical enamel of 42 freshly extracted human mandibular third molars was ground flat to expose the cervical dentin. The dentin surfaces were polished with a series of silicon carbide papers, and the smear was removed with an ethylenediamine tetra-acetic acid solution. The teeth were randomly divided into six groups as follows: group 1, Vivasens; group 2, BisBlock; group 3, fluoride gel; group 4, Nd:YAG laser; group 5, Clearfil SE + Nd:YAG laser; and group 6, no treatment (control). The specimens were then restored with a two-step self-etch adhesive, with the exception of group 5. Five specimens from each group were restored with a nanohybrid composite resin. The adhesive interface of two specimens from each group was examined using scanning electron microscopy. The specimens were sectioned perpendicularly to the adhesive interface to produce beams (adhesive area 1 mm(2)). The beams were then attached to a microtensile tester and stressed to failure at 1 mm/min. The data were compared using one-way analysis of variance at a significance level of 0.05. The microtensile bond strengths of the control group were significantly higher than those found for group 1, group 2, group 3, and group 4 (p< 0.05). No significant difference was found between group 5 and the control group. Most of the premature failures were seen in group 2 (80%), and the fewest premature failures were seen in group 5 (13.3%). The SEM findings verified the microtensile test findings. In conclusion, desensitizing treatment procedures (with the exception of Clearfil SE + Nd:YAG laser) reduced the microtensile bond strength of a two-step self-etch adhesive to dentin.
本体外研究旨在评估颈敏治疗（钕钇铝石榴石 [Nd:YAG] 激光和常规技术）对处理牙本质的胶粘剂微拉伸结合强度的影响。42 颗刚提取的人类下颌第三磨牙的颊侧颈釉质被磨平，露出颈牙本质。牙本质表面用一系列碳化硅砂纸抛光，并用乙二胺四乙酸溶液去除玷污层。牙齿被随机分为六组：组 1，Vivasens；组 2，BisBlock；组 3，氟凝胶；组 4，Nd:YAG 激光；组 5，Clearfil SE + Nd:YAG 激光；组 6，无处理（对照组）。除组 5 外，其余各组均用两步自酸蚀胶粘剂修复。每组 5 个标本用纳米复合树脂修复。每组 2 个标本的粘结界面用扫描电子显微镜检查。将标本沿粘结界面垂直切割，制成梁（粘结面积 1mm²）。然后将梁粘贴到微拉伸测试仪上，以 1mm/min 的速度施加应力直至破坏。使用单向方差分析比较数据，显著性水平为 0.05。对照组的微拉伸结合强度明显高于组 1、组 2、组 3 和组 4（p<0.05）。组 5 与对照组之间无显著差异。组 2 中出现的早期失效最多（80%），组 5 中出现的早期失效最少（13.3%）。SEM 结果验证了微拉伸试验结果。结论：脱敏处理程序（Clearfil SE + Nd:YAG 激光除外）降低了两步自酸蚀胶粘剂对牙本质的微拉伸结合强度。
