AIM To evaluate the effect of the addition of surfactants to sodium hypochlorite (NaOCl) on the removal of accumulated hard tissue debris (AHTD), before and after final irrigation with 17% EDTA, from mesial canals of mandibular molars through microcomputed tomographic (micro-CT) analysis. METHODOLOGY Thirty moderately curved mandibular mesial roots with Vertucci type II canal configuration were selected and scanned in a micro-CT device at an isotropic resolution of 22.9 μm. The specimens were assigned to three groups (n = 10) with respect to the root length, degree of curvature of the mesial root, volume and 3D anatomy of the root canals according to the irrigating solution used during root canal preparation: 2.5% NaOCl and 0.1% Benzalkonium Chloride, 2.5% NaOCl and 0.1% Tween 80 and 2.5% NaOCl without additives. The root canals were instrumented up to Reciproc R25 instrument. Then, the specimens were scanned again after canal preparation and after final irrigation with 17% EDTA, and the registered data sets were examined to evaluate the percentage of AHTD. For comparison between the different groups before and after using 17% EDTA, the Kruskal-Wallis test was used with a significance level of 5%. For comparison between the same groups before and after using 17% EDTA, the Wilcoxon test was used with a significance level of 5%. RESULTS None of the irrigant solutions tested was able to completely eliminate hard tissue debris from mesial canals of mandibular molars. There were no significant differences in the percentage of AHTD amongst the different irrigation solutions (P > 0.05). Final irrigation with 17% EDTA significantly reduced the percentage of AHTD (P < 0.05), without differences amongst the groups (P > 0.05). CONCLUSIONS The addition of surfactants to NaOCl did not affect the removal of AHTD from mesial canals of extracted mandibular molars. Final irrigation with 17% EDTA significantly improved AHTD removal.

中文翻译：

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在次氯酸钠中添加表面活性剂对去除硬组织碎片的影响。

目的评估在次氯酸钠（NaOCl）中添加表面活性剂对最终用17％EDTA冲洗之前和之后通过下颌磨牙的中膜根管通过微型计算机断层扫描（micro-tomography）进行清除的硬组织碎屑（AHTD）的清除作用CT）分析。方法选择30条II型Vertucci根管的中度弯曲的下颌内侧牙根，并在微型CT装置中以22.9μm的各向同性分辨率进行扫描。根据根管准备过程中使用的冲洗溶液，将根部长度，中根的弯曲度，根管的体积和3D解剖分为三组（n = 10）：2.5％NaOCl和0.1％苯扎氯铵，2.5％NaOCl和0.1％Tween 80和2.5％NaOCl（不含添加剂）。根管检查直至使用Reciproc R25器械。然后，在根管准备和最终冲洗后用17％EDTA再次扫描标本，并检查注册数据集以评估AHTD的百分比。为了比较使用17％EDTA之前和之后的不同组之间的差异，使用了显着性水平为5％的Kruskal-Wallis检验。为了比较使用17％EDTA之前和之后的相同组之间的差异，使用了显着性水平为5％的Wilcoxon检验。结果测试的所有冲洗液均无法完全消除下颌磨牙中隔管的硬组织碎屑。在不同的灌溉溶液中，AHTD的百分比没有显着差异（P> 0.05）。最终灌溉用17％EDTA可以显着降低AHTD的百分比（P <0.05），各组之间无差异（P> 0.05）。结论向NaOCl中添加表面活性剂不会影响从拔除的下颌磨牙的中耳道中去除AHTD。使用17％EDTA的最终灌溉显着改善了AHTD的去除。