Department of Dental Pathology and Therapeutics, School of Dentistry, University of Granada, Granada, Spain.
J Endod. 2010 Feb;36(2):308-11. doi: 10.1016/j.joen.2009.10.029. Epub 2009 Dec 14.
Elimination of the smear layer after root canal instrumentation requires the use of irrigating solutions. This cleaning can be completed with passive ultrasonic or sonic irrigation. The aim of this study was to evaluate the effectiveness of the EndoActivator System in removing the smear layer after rotary root canal instrumentation, with and without a final flush of 17% ethylenediaminetetraacetic acid (EDTA) solution, in coronal, middle, and apical thirds.
Forty single-canal teeth were decoronated and randomly divided into 4 groups (n = 10). The groups were instrumented by using Mtwo System. EndoActivator was used with a final rinse of 1 mL of 17% EDTA or 4% NaOCl for 1 minute. The roots were longitudinally split and were grooved in the coronal, middle, and apical thirds. Scanning electron microscopy digital photomicrographs at 400x were taken to evaluate the amount of smear layer in each third.
The NaOCl/EndoActivator group did not remove any smear layer of the root canal wall (100% in the coronal, middle, and apical thirds). In the groups that used 17% EDTA (with or without EndoActivator), the smear layer was eliminated completely (100%) in the coronal third, but the amount of removal was less in the other two thirds. The comparisons between NaOCl versus NaOCl/EndoActivator groups and EDTA/NaOCl versus EDTA/EndoActivator/NaOCl groups showed no significant differences in root canal thirds.
The EndoActivator System did not enhance the removal of smear layer as compared with conventional Max-I-Probe irrigation with NaOCl and EDTA.
根管器械预备后，消除玷污层需要使用冲洗液。这种清洁可以通过被动超声或超声冲洗来完成。本研究旨在评估在旋转根管器械预备后，EndoActivator 系统在有无 17%乙二胺四乙酸（EDTA）溶液终冲洗的情况下，在根管冠、中、根尖三分之一处去除玷污层的效果。
40 颗单根管牙被去冠并随机分为 4 组（n = 10）。使用 Mtwo 系统对每组进行器械预备。使用 EndoActivator 并用 1 毫升 17% EDTA 或 4% NaOCl 进行最终冲洗 1 分钟。将根纵向劈开，在根管冠、中、根尖三分之一处开槽。在 400x 下拍摄扫描电子显微镜数码照片，以评估每个三分之一处的玷污层量。
NaOCl/EndoActivator 组未去除根管壁的任何玷污层（根管冠、中、根尖三分之一均为 100%）。在使用 17% EDTA 的组（有无 EndoActivator）中，根管冠三分之一的玷污层完全去除（100%），但其他两个三分之一的去除量较少。NaOCl 与 NaOCl/EndoActivator 组和 EDTA/NaOCl 与 EDTA/EndoActivator/NaOCl 组之间的比较显示，根管三分之一处无显著差异。
与常规 Max-I-Probe 冲洗联合 NaOCl 和 EDTA 相比，EndoActivator 系统对玷污层的去除效果没有增强。
