Kermanshah Hamid, Yasini Esmail, Hoseinifar Razieh
Department of Operative Dentistry, Dental Research Center, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
Dent Res J (Isfahan). 2016 May-Jun;13(3):264-71. doi: 10.4103/1735-3327.182188.
There are many concerns regarding the marginal seal of composite restorations, especially when composite restorations are subjected to cyclic loading. The aim of this study was to evaluate the effect of cyclic loading on the microleakage of silorane based composite compared with low shrinkage methacrylate-based composites in class V cavities.
In this in vitro study, class V cavities were prepared on the facial and lingual surfaces of 48 human premolars (96 cavities). The teeth were randomly divided into four groups of 12 teeth (24 cavities) each and restored as follows: Group 1 (Siloran System Adhesive + Filtek P90), Group 2 (All Bond SE + Aelite LS Posterior), Group 3 (Futurabond NR + Grandio), and Group 4 (G-Bond + Kalore-GC). All the specimens were thermocycled for 2000 cycles (5-55°C) and then half of the specimens from each group, were Load cycled. All teeth were immersed in 0.5% basic fuchsine dye, sectioned, and observed under a stereomicroscope. Data were analyzed using Wilcoxon test, Kruskal-Wallis, and Mann-Whitney U-tests. P < 0.05 was considered as significant.
In both unloaded and loaded groups, no statistically significant differences were observed among four composites at the occlusal margin, but a significant difference in gingival microleakage was found between Aelite and silorane. Occlusal and gingival microleakage was not affected by cyclic loading in none of the four restorative materials.
Silorane did not provide better marginal seal than the low shrinkage methacrylate-based composites (except Aelite). In addition, cyclic loading did not affect the marginal microleakage of evaluated composite restorations.
复合树脂修复体的边缘封闭性存在诸多问题，尤其是在复合树脂修复体承受循环载荷时。本研究的目的是评估与低收缩甲基丙烯酸酯基复合树脂相比，循环载荷对Ⅴ类洞型中硅烷类复合树脂微渗漏的影响。
在这项体外研究中，在48颗人类前磨牙的颊面和舌面制备Ⅴ类洞型（96个洞）。将牙齿随机分为四组，每组12颗牙（24个洞），并按以下方式进行修复：第1组（Siloran系统粘结剂+Filtek P90），第2组（All Bond SE+Aelite LS Posterior），第3组（Futurabond NR+Grandio），第4组（G-Bond+Kalore-GC）。所有标本进行2000次循环热循环（5-55°C），然后每组一半的标本进行加载循环。所有牙齿浸入0.5%碱性品红染料中，切片，并在体视显微镜下观察。使用Wilcoxon检验、Kruskal-Wallis检验和Mann-Whitney U检验分析数据。P<0.05被认为具有统计学意义。
在未加载组和加载组中，四种复合树脂在咬合边缘均未观察到统计学上的显著差异，但Aelite和硅烷类复合树脂在牙龈微渗漏方面存在显著差异。四种修复材料中，循环载荷均未影响咬合和牙龈微渗漏。
除Aelite外，硅烷类复合树脂的边缘封闭性并不优于低收缩甲基丙烯酸酯基复合树脂。此外，循环载荷并未影响所评估的复合树脂修复体的边缘微渗漏。
