Protaper根管预备器械折断的影响因素分析

Evaluation of the fracture of nickel-titanium rotary Protaper during root canal preparation

目的:分析机用镍钛Protaper预备弯曲根管时的折断情况及原因,为临床使用提供参考。方法:收集因牙周病松动需要拔除的后磨牙169颗,采用机用Protaper预备根管,记录发生折断的器械使用的次数和完成的根管数,汇总折断器械的型号和类型。采用SPSS18.0软件包对数据进行统计学分析。结果:共使用器械43套,其中17套使用至预期目标15个根管后抛弃且完好无折断;而另外26套,每套器械均有不同数目的折断或弯曲扭转。结论:机用镍钛器械Protaper预备弯曲根管成形效果好,Protaper快速高效,临床操作中须注意预防器械折断。在弯曲根管中,F2折断率较高,提示临床应用时不应过于追求较大的锥度。

PURPOSE： To assess clinical application of Nickel-titanium （NiTi） rotary instruments Protaper in preparation of curved root canals. METHODS： 281 curved canals from 169 extracted molars were instrumented by Protaper rotary instruments using crown-down technique.An analysis was carried out regarding the relationship between the broken files and canal distribution,degree of curvature of canals ,and the relationship between amount of the broken files and the duration was also included. SPSS18.0 software package was used for statistical analysis. RESULTS： A total of 43 kits files were used in the preparation of 281 curved root canals, and broken files often happened in canals with curvature of 〉30~ and very complex canals. CONCLUSIONS： The fracture of NiTi instruments is closely related to the anatomy of the root canal. With the use of NiTi rotary instruments Protaper, curved root canals can be prepared effectively.Meanwhile,the problem of instrument separation should be prevented