School of Dentistry, Federal University of Maranhão, São Luiz, MA, Brazil.
J Appl Oral Sci. 2012 May-Jun;20(3):329-34. doi: 10.1590/s1678-77572012000300006.
The aim of this study was to compare the correspondence between gap formation and apical microleakage in root canals filled with epoxy resin-based (AH Plus) combined or not with resinous primer or with a dimethacrylate-based root canal sealer (Epiphany).
Thirty-nine lower single-rooted human premolars were filled by the lateral condensation technique (LC) and immersed in a 50-wt% aqueous silver nitrate solution at 37ºC (24 h). After longitudinal sectioning, epoxy resin replicas were made from the tooth specimens. Both the replicas and the specimens were prepared for scanning electron microscopy (SEM). The gaps were observed in the replicas. Apical microleakage was detected in the specimens by SEM/energy dispersive spectroscopy (SEM/EDS). The data were analyzed statistically using an Ordinal Logistic Regression model and Analysis of Correspondence (α=0.05).
Epiphany presented more regions containing gaps between dentin and sealer (p<0.05). There was correspondence between the presence of gaps and microleakage (p<0.05). Microleakage was similar among the root-filling materials (p>0.05).
The resinous primer did not improve the sealing ability of AH Plus sealer and the presence of gaps had an effect on apical microleakage for all materials.
本研究旨在比较用环氧树脂基（AH Plus）与树脂基底漆联合或不联合、或用二甲基丙烯酸酯基根管封闭剂（Epiphany）填充根管后形成的间隙与根尖微渗漏之间的吻合度。
39 颗下颌单根人前磨牙采用侧向加压技术（LC）进行填充，并在 37°C 的 50wt% 硝酸银水溶液中浸泡 24 小时。牙齿样本进行纵向切片后，用环氧树脂复制件进行复制。对复制件和样本均进行扫描电子显微镜（SEM）准备。在复制件中观察间隙。通过 SEM/能量色散光谱（SEM/EDS）在样本中检测根尖微渗漏。使用有序逻辑回归模型和对应分析（α=0.05）对数据进行统计分析。
Epiphany 组在牙本质和封闭剂之间有更多包含间隙的区域（p<0.05）。存在间隙与微渗漏之间存在对应关系（p<0.05）。根充材料之间的微渗漏相似（p>0.05）。
树脂底漆并没有提高 AH Plus 封闭剂的密封能力，并且所有材料的间隙存在均对根尖微渗漏有影响。
