Mokhtari Hadi, Shahi Shahriar, Janani Maryam, Reyhani Mohammad Frough, Mokhtari Zonouzi Hamid Reza, Rahimi Saeed, Sadr Kheradmand Hamid Reza
Dental and Periodontal Research Center, Department of Endodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran;
Iran Endod J. 2015;10(2):131-4. Epub 2015 Mar 18.
Microleakage can result in failure of endodontic treatment. An important characteristic of endodontic sealer is sealing ability. The aim of this experimental study was to compare the apical leakage of teeth obturated with gutta-percha and three different sealers (resin- and zinc oxide eugenol-based) with/without smear layer (SL).
In this study, 100 single-rooted teeth were used after cutting off their crowns. Cleaning and shaping was carried out with step-back technique and the samples were randomly divided into three groups (n=30) which were then divided into two subgroups (n=15) according to the presence/absence of SL. Two negative and positive control groups (n=5) were also prepared. In the various groups, the canals were obturated with gutta-percha and either of the test sealers (AH-26, Adseal or Endofill). The samples were submerged in India ink for 72 h. Then they were longitudinally sectioned and observed under a stereomicroscope at 20× magnification. Data were analyzed with descriptive statistical methods and one-way ANOVA. The significance level was set at 0.05.
The mean penetration length of dye in AH-26, Adseal and Endofill samples were 2.53, 2.76 and 3.03 mm, respectively. The differences between three groups were not significant (P>0.05); also, the mean dye penetration in AH-26, Adseal and Endofill samples in presence or absence of the SL was not significantly different.
AH-26, Adseal and Endofill were similarly effective in prevention of apical microleakage. Differences in the mean dye penetration between the groups with/without the SL were not statistically significant.
微渗漏可导致根管治疗失败。根管封闭剂的一个重要特性是封闭能力。本实验研究的目的是比较用牙胶和三种不同封闭剂（树脂基和氧化锌丁香酚基）封闭的牙齿在有/无玷污层（SL）情况下的根尖渗漏情况。
在本研究中，100颗单根牙截冠后使用。采用逐步后退技术进行清理和成形，样本随机分为三组（n = 30），然后根据有无玷污层分为两个亚组（n = 15）。还制备了两个阴性和阳性对照组（n = 5）。在各个组中，根管分别用牙胶和一种测试封闭剂（AH - 26、Adseal或Endofill）进行充填。样本浸泡在印度墨水中72小时。然后纵向切片，在20倍放大倍数的体视显微镜下观察。数据采用描述性统计方法和单因素方差分析进行分析。显著性水平设定为0.05。
AH - 26、Adseal和Endofill样本中染料的平均渗透长度分别为2.53、2.76和3.03毫米。三组之间的差异不显著（P>0.05）；同样，有无玷污层情况下AH - 26、Adseal和Endofill样本中染料的平均渗透情况也无显著差异。
AH - 26、Adseal和Endofill在预防根尖微渗漏方面效果相似。有/无玷污层组之间染料平均渗透的差异无统计学意义。
