Abstract：Objective To investigate the removal effect of smear layer on paients' tooth crown with layer back root canal preparation method, layer-depth root canal preparation method and ProTaper crown down root canal preparation method. Methods 273 patients with tooth crown smear layer were selected in our hospital from October 2011 to October 2013. These patients were randomly divided into three groups. In the first group, 91 patients were treated with layer back root canal preparation method. In the second group, 91 patients were treated with layer-depth root canal preparation method. In the third group, 91 patients were treated with ProTaper crown down root canal preparation method. Then root canal wall smear layer scores, colony numbers of root canal smear layer and the occurence rates of adverse events before and after treatment were compared within three groups. Results After treatment, root canal wall smear layer scores, colony numbers of root canal smear layer and the occurence rates of adverse events significantly decreased in three groups. Root canal wall smear layer score, colony number of root canal smear layer and the occurence rate of adverse events in the second group were significantly lower than those in the first group (P＜0.05). Root canal wall smear layer score, colony number of root canal smear layer, and the occurence rate of adverse events in the third group were significantly lower than those in the first group and the second group (P<0.05). Conclusion These three methods are effective in removing smear layer on the tooth crown of patients, while the removal effect of ProTaper crown down root canal preparation method is the best of all.
宋卫健. 不同预备根管方法对根管治疗患者牙齿冠部玷污层的去除效果[J]. 中国医疗设备, 2014, 29(12): 130-132.
SONG Wei-jian. Removal Efficiency of Different Root Canal Preparation Methods for Smear Layer on Patients’ Tooth Crown. China Medical Devices, 2014, 29(12): 130-132.
