机用ProTaper镍钛器械折断的临床观察及影响因素分析  

Fracture of ProTaper rotary instrument with analysis on influencial factors

作　　者：马宏伟[1] 王青[1] 王丽丽[1] 

机构地区：[1]山东大学口腔医院牙体牙髓病科,山东省口腔医学重点实验室,山东济南250012

出　　处：《上海口腔医学》2010年第4期349-353,共5页Shanghai Journal of Stomatology

基　　金：山东省自然科学基金(Y2006C48)~~

摘　　要：目的:观察ProTaper机用镍钛根管治疗器械临床使用的折断情况,分析影响其折断的因素。方法:选取2008年9月至2009年9月间来我院牙体牙髓科就诊的需进行根管治疗的患者共432例,使用ProTaper机用镍钛器械进行根管预备,记录发生折断的器械个数、型号、牙位以及预备的根管数目。使用SPSS17.0软件包中的Fisher确切概率法对数据进行统计学分析。结果:27根器械发生折断,折断率为10%;其中,21根器械发生疲劳折断,6根发生扭转折断。统计学分析显示,SX、S1、F1号器械与其他型号相比更易发生折断。折断绝大多数发生在进行后牙根管预备时。预备根管数大于20的器械,折断率明显增加。结论:使用ProTaper镍钛机用器械预备磨牙根管时更易发生折断;特定型号的器械(SX、S1、F1)折断率较高,临床使用时应加以注意。器械使用次数最好不要超过20次。PURPOSE： To evaluate the fracture of ProTaper rotary instrument clinically,and analyze the influencial factors.METHODS： A total of 432 patients who underwent root canal therapy were selected from our endodontic clinic between September 2008 and September 2009.ProTaper rotary instrument was used to achieve root canal preparation,the number and size of fracture instruments,the position of treated tooth were recorded.The data was analyzed by SPSS17.0 software package for Fisher’s exact test.RESULTS ： There were a total of 27 fractured ProTaper rotary instruments,with a fracture rate of 10%.Twenty-one fractured instruments were fatigue fracture and 6 were torsion fracture.Statistical analysis indicated that SX,S1,F1 were more likely to fracture than other sizes.Vast majority of instrument fracture occurred in molar root canals.The fracture rate was significantly increased after the number of prepared canal exceeded 20 times.CONCLUSIONS： From this study,we conclude that ProTaper rotary instrument is more likely to fracture when preparing molar canals,instruments of particular size（SX S1 FI） with higher fracture rate should be used with great care in clinic.The times of using each ProTaper file should be less than 20 in consideration of safety.

关 键 词：PROTAPER机用镍钛器械 折断 磨牙 

分 类 号：R781.05[医药卫生—口腔医学]