Department of Restorative Dentistry, School of Dentistry, University of São Paulo, São Paulo, São Paulo, Brazil.
J Endod. 2011 Sep;37(9):1268-71. doi: 10.1016/j.joen.2011.06.009. Epub 2011 Jul 16.
The aim of this study was to evaluate the effectiveness of different irrigant agitation techniques on smear layer removal in curved root canals.
Mesiobuccal canals of 62 extracted lower molars with a curvature of 33 degrees were used and instrumented up to ProTaper F2. The samples were divided into 3 experimental groups according to the final irrigation: conventional irrigation, ultrasonic irrigation, and sonic irrigation by using the EndoActivator system. The control group was composed of 2 specimens without any final irrigation. In all of the experimental groups, 5 mL of 17% ethylenediaminetetraacetic acid was used for 1 minute, and 5 mL of 2.5% NaOCl was used for 30 seconds. The analysis of the apical region was performed via scanning electron microscopy by 3 examiners. The data were submitted to the Kruskal-Wallis and Dunn tests (P < .05).
The activation systems removed significantly more smear layer than did conventional irrigation.
Sonic and ultrasonic irrigation resulted in better removal of the smear layer in the apical third of curved root canals than did conventional irrigation.
本研究旨在评估不同冲洗液搅拌技术对弯曲根管内玷污层去除的效果。
使用 62 颗具有 33 度弯曲度的下颌磨牙近中颊根管，并采用 ProTaper F2 器械进行根管预备。根据最终冲洗液将样本分为 3 个实验组：常规冲洗、超声冲洗和使用 EndoActivator 系统的声冲洗。对照组由 2 个未进行任何最终冲洗的样本组成。在所有实验组中，使用 17%乙二胺四乙酸 5 毫升冲洗 1 分钟，使用 2.5%次氯酸钠冲洗 30 秒。通过 3 位检查者的扫描电子显微镜对根尖区域进行分析。数据采用 Kruskal-Wallis 和 Dunn 检验（P<.05）。
活化系统去除的玷污层明显多于常规冲洗。
与常规冲洗相比，超声和声冲洗在弯曲根管的根尖三分之一处能更好地去除玷污层。
