逐步后退法与常规法在根管预备中的疗效分析

目的：通过对临床上感染根管的治疗，比较逐步后退法与常规法的疗效，从而为临床上感染根管的治疗提供参考。方法：将临床感染根管病例362例随机分为两组，试验组（S组，n=185）用逐步后退法预备根管，对照组（R组，n=177）用常规法预备根管。根管治疗完成后随即拍片观察，应用SPSS13．0统计软件包对数据进行处理。结果：对于弯曲根管，对照组出现根管预备中常见的缺陷明显高于试验组；对于普通根管（较直根管），两组比较无显著性差异。结论：逐步后退法在弯曲根管预备中优于传统常规法；常规法适应证选择面很窄，只适用于直根管。

Clinical analysis of step-back technique and the conventional method in the root canal preparation

Objective： To provide reference for the treatment of the infected root canal through the comparison on the clinical effect between the step-back technique and routine preparation technique. Methods： 362 cases of patients were divided into two groups randomly. 185 cases were prepared by the step-back technique （group S） while 177 cases were prepared by the routine preparation technique （group R）. The effect was recorded right now. The results were assessed by SPSS 13.0 software package. Results： The curative rate of group S was higher than that of group R for the curving root canals, there was no difference between the two groups for normal root canals; group S was significantly better than group R on the incidence and degree of the post-operative pain. Conclusion： The step-back technique is better than the routine preparation technique. Routine preparation technique is only suit for straight root canals.