Cehreli Zafer C, Akça Taner
Department of Pediatric Dentistry, Hacettepe University, Faculty of Dentistry, Ankara, Turkey.
J Dent Child (Chic). 2003 May-Aug;70(2):139-44.
Direction of dentin tubules is an important factor that affects bond strength of contemporary adhesive materials. Because conservative proximal cavity preparations in primary teeth contain more dentin tubules running oblique or parallel to the cavity walls, this study was conducted to evaluate the influence of tubule orientation on the bond strength to primary dentin. A polyacid-modified resin composite material was used as the test material. A microtensile test was utilized to enable evaluation of bond strengths in three different tubule orientations (perpendicular, oblique, parallel) following aging of the resindentin bonds by long-term immersion of the test samples in water. Samples bonded parallel to the dentin tubules showed the highest microtensile bond strength, followed by the oblique and perpendicular groups. Statistical analysis of the data showed no significant difference between the bond strength of parallel and oblique groups. Independent of the tubule orientation, all samples revealed cohesive fracture within dentin.
牙本质小管的方向是影响当代粘结材料粘结强度的一个重要因素。由于乳牙保守性邻面洞制备中含有更多与洞壁呈斜向或平行排列的牙本质小管，因此开展本研究以评估小管方向对乳牙牙本质粘结强度的影响。使用一种含多酸的复合树脂材料作为测试材料。通过将测试样本长期浸泡在水中使树脂-牙本质粘结老化后，利用微拉伸试验评估三种不同小管方向（垂直、斜向、平行）的粘结强度。与牙本质小管平行粘结的样本显示出最高的微拉伸粘结强度，其次是斜向组和垂直组。数据的统计分析表明平行组和斜向组的粘结强度之间无显著差异。与小管方向无关，所有样本均显示在牙本质内发生内聚性断裂。
