Esteves-Oliveira Marcella, Zezell Denise M, Apel Christian, Turbino Miriam L, Aranha Ana Cecília Corrêa, Eduardo Carlos de Paula, Gutknecht Norbert
Department for Conservative Dentistry, Periodontology and Preventive Dentistry (ZPP), RWTH Aachen University, Pauwelsstr. 30, Aachen, Germany.
Photomed Laser Surg. 2007 Oct;25(5):373-80. doi: 10.1089/pho.2007.2044.
The purpose of this study was to evaluate the tensile bond strength of a self-etching primer system to enamel and dentin surfaces treated with Er:YAG and Er,Cr:YSGG lasers.
The recently introduced self-etching primer systems have been shown to adhere better to dental surfaces with thin or no smear layers. Moreover, there have been no previous reports on the bond strength of these adhesives to Er,Cr:YSGG laser-irradiated enamel and dentin, which have been shown to be free of a smear layer.
Thirty samples of enamel and thirty of dentin were divided into three groups. The first group of each substrate served as a control with a standardized bur cut, and the other two groups were conditioned with Er:YAG (350 mJ, 10 Hz, 20 J/cm(2) for enamel; 300 mJ, 6 Hz, 17 J/cm(2) for dentin) and Er,Cr:YSGG laser (125 mJ, 20 Hz, 16 J/cm(2) for both substrates). After the bonding procedure, samples were restored with composite resin, and the tensile bond strength test was performed.
The ANOVA two-way analysis and the Tukey test at 5% significance level showed that for enamel and dentin, the bond strength values were statistically higher in Er:YAG-laser treated than in Er,Cr:YSGG-laser treated surfaces (p = 0.0001). However, bond strength means for both laser-irradiated groups were statistically lower than for the bur cut group (Er:YAG: p = 0.0281 and Er,Cr:YSGG: p < 0.0001). SEM observation of laser-irradiated surfaces revealed a roughened aspect and absence of smear layer.
The self-etching system adhesion was influenced by the type of erbium laser used, and the bond strength was higher in the Er:YAG-laser irradiated than in the Er,Cr:YSGG-laser irradiated surfaces.
本研究旨在评估自酸蚀底漆系统与经铒激光（Er:YAG）和铒铬钇石榴石激光（Er,Cr:YSGG）处理的牙釉质和牙本质表面之间的拉伸粘结强度。
最近推出的自酸蚀底漆系统已被证明能更好地粘附于薄涂片层或无涂片层的牙体表面。此外，此前尚无关于这些粘结剂与经Er,Cr:YSGG激光照射的牙釉质和牙本质（已证明无涂片层）之间粘结强度的报道。
将30个牙釉质样本和30个牙本质样本分为三组。每组每种基质的第一个样本作为对照，采用标准车针切割，另外两组分别用Er:YAG激光（牙釉质：350 mJ，10 Hz，20 J/cm²；牙本质：300 mJ，6 Hz，17 J/cm²）和Er,Cr:YSGG激光（两种基质均为125 mJ，20 Hz，16 J/cm²）进行处理。粘结程序完成后，用复合树脂修复样本，并进行拉伸粘结强度测试。
方差分析双向分析及5%显著性水平的Tukey检验表明，对于牙釉质和牙本质，Er:YAG激光处理表面的粘结强度值在统计学上高于Er,Cr:YSGG激光处理表面（p = 0.0001）。然而，两个激光照射组的粘结强度平均值在统计学上均低于车针切割组（Er:YAG：p = 0.0281；Er,Cr:YSGG：p < 0.0001）。激光照射表面的扫描电镜观察显示表面粗糙且无涂片层。
自酸蚀系统的粘结受所用铒激光类型的影响，Er:YAG激光照射表面的粘结强度高于Er,Cr:YSGG激光照射表面。
