Owens Barry M, Johnson William W
Department of Restorative Dentistry, University of Tennessee, College of Dentistry, Memphis, USA.
Oper Dent. 2007 Jan-Feb;32(1):67-72. doi: 10.2341/06-17.
This in vitro study evaluated the coronal and apical marginal microleakage of four self-etch, seventh generation adhesive systems. Sixty non-carious human molars were randomly assigned to four groups (n = 12). Class V cavities were prepared on the facial or lingual surface of each tooth with coronal margins in enamel and apical margins in cementum (dentin) at the cementoenamel junction. The preparations were restored using four self-etch adhesive systems (iBond, G-Bond, Xeno IV and Clearfil S3 Bond) and a control (no adhesive), followed by insertion of Gradia Direct microfilled hybrid resin composite. The teeth (specimens) were thermocycled 1,000 cycles, immersed in 1% methylene blue dye for 24 hours and invested in acrylic resin. The specimen blocks were then sectioned longitudinally, with dye penetration (microleakage) examined using a 20x binocular microscope. Coronal and apical margins were scored separately for microleakage using a 0-3 ordinal ranking system. Data were analyzed using non-parametric tests at a p < 0.05 level of significance. A comparison of adhesive and control groups at the coronal and apical margins revealed that significant (p < .0001) differences were exhibited. At the coronal margin, Xeno IV revealed significantly less leakage than the other adhesives, with Clearfil S3 Bond exhibiting significantly less leakage at the apical margin. Groups with no adhesive treatment (control) showed significantly greater leakage at both the coronal and apical margin locations. A Wilcoxon signed rank test showed no significant differences at the coronal compared to the apical margins of the four adhesive systems and control tested.
这项体外研究评估了四种第七代自酸蚀粘结系统的冠部和根尖边缘微渗漏情况。60颗无龋的人类磨牙被随机分为四组（n = 12）。在每颗牙齿的颊面或舌面制备V类洞，冠部边缘位于釉质，根尖边缘位于牙骨质（牙本质）与釉牙骨质界处。使用四种自酸蚀粘结系统（iBond、G-Bond、Xeno IV和Clearfil S3 Bond）和一个对照组（不使用粘结剂）对制备的洞进行修复，随后填入Gradia Direct微填料混合树脂复合材料。将牙齿（标本）进行1000次热循环，浸入1%亚甲蓝染料中24小时，然后包埋在丙烯酸树脂中。接着将标本块纵向切片，使用20倍双目显微镜检查染料渗透情况（微渗漏）。使用0-3等级排序系统分别对冠部和根尖边缘的微渗漏进行评分。数据采用非参数检验进行分析，显著性水平为p < 0.05。对粘结剂组和对照组在冠部和根尖边缘的比较显示，存在显著差异（p <.0001）。在冠部边缘，Xeno IV显示的渗漏明显少于其他粘结剂，而Clearfil S3 Bond在根尖边缘的渗漏明显较少。未进行粘结剂处理的对照组在冠部和根尖边缘的渗漏都明显更大。Wilcoxon符号秩检验显示，在测试的四种粘结系统和对照组中，冠部边缘与根尖边缘相比无显著差异。
