Department of Restorative Dentistry, School of Dentistry, University of São Paulo, São Paulo, SP, Brazil.
Braz Oral Res. 2010 Jul-Sep;24(3):355-60. doi: 10.1590/s1806-83242010000300016.
The aim of this in vitro study was to evaluate the tensile bond strength of a self-etching adhesive system to three different dentinal substrates. Primary molar teeth that had been recently exfoliated (RE), with unknown time of exfoliation (UT), and extracted due to prolonged retention (PR) were used for this investigation. Ten primary molar teeth of each group were cut in the middle following the mesio-distal direction, creating a total of twenty specimens per group. The specimens were included in acrylic resin and had a flat dentin surface exposed. The self-etching adhesive system was applied to this surface and a 3-millimeter high cone with diameter of 2 mm in the adhesion area was constructed using composite resin. The specimens were stored in distilled water at 37ºC for 24 hours. Fifteen specimens of each substrate were used for the tensile bond test (n = 15) and 5 had the interface analyzed by scanning electron microscopy (SEM). The data was examined by one-way ANOVA and presented no significant differences between groups (p = 0.5787). The mean values obtained for RE, UT and PR were 18.39 ± 9.70, 19.41 ± 7.80, and 23.30 ± 9.37 MPa, respectively. Any dentinal substrates of primary teeth studied are safe for tensile bond strength tests with adhesive systems.
本体外研究旨在评估一种自酸蚀粘结系统对三种不同牙本质基底的拉伸粘结强度。本研究使用了近期（RE）、未知（UT）和因长期保留（PR）而拔除的乳磨牙。每个组别的十颗乳磨牙沿近远中方向切开，每组共产生二十个样本。将样本包含在丙烯酸树脂中，并使平坦的牙本质表面暴露。将自酸蚀粘结系统应用于该表面，并使用复合树脂在粘结区域构建 3 毫米高、直径为 2 毫米的圆锥体。将样本在 37°C 的蒸馏水中储存 24 小时。每个基底的十五个样本用于拉伸粘结测试（n = 15），另外五个样本的界面用扫描电子显微镜（SEM）进行分析。数据采用单因素方差分析，各组间无显著差异（p = 0.5787）。RE、UT 和 PR 的平均数值分别为 18.39 ± 9.70、19.41 ± 7.80 和 23.30 ± 9.37 MPa。研究中任何一种乳磨牙的牙本质基底都适用于与粘结系统进行拉伸粘结强度测试。
