Scelza M F, Antoniazzi J H, Scelza P
Federal University Fluminense (UFF), Niterói, Brazil.
J Endod. 2000 Jun;26(6):355-8. doi: 10.1097/00004770-200006000-00011.
The purpose of this in vitro study was to determine the degree of removal of pulpal remnants and smear layer from root canals after final irrigation with three different solutions. During instrumentation the step-back preparation and 1% NaOCl were used. The final 4-min, 30-ml irrigation varied as follows: group I, 10 ml of 1% NaOCl + 10 ml of 10% citric acid + 10 ml of distilled water; group II, 15 ml of 0.5% NaOCl + 15 ml of EDTA-T; and group III, 10 ml of 5% NaOCl + 10 ml of 3% H2O2 + 10 ml of 5% NaOCl. Scanning electron microscopic photomicrographs were evaluated for the mean number of visible open dentinal tubules by three observers. The largest number of visible tubules in the three groups was in the cervical third, followed by the middle and apical thirds. There was no statistically significant difference between groups I and II when third was compared with third; however, groups I and II had significantly more visible dentinal tubules than group III.
本体外研究的目的是确定用三种不同溶液进行最终冲洗后，根管内牙髓残余物和玷污层的清除程度。在根管预备过程中，采用逐步后退法预备并使用1%次氯酸钠。最终4分钟、30毫升的冲洗液如下：第一组，10毫升1%次氯酸钠+10毫升10%柠檬酸+10毫升蒸馏水；第二组，15毫升0.5%次氯酸钠+15毫升乙二胺四乙酸三钠；第三组，10毫升5%次氯酸钠+10毫升3%过氧化氢+10毫升5%次氯酸钠。由三名观察者对扫描电子显微镜照片进行评估，以确定可见开放牙本质小管的平均数。三组中可见小管数量最多的是颈部三分之一，其次是中部和根尖三分之一。当比较各三分之一时，第一组和第二组之间无统计学显著差异；然而，第一组和第二组的可见牙本质小管明显多于第三组。
