机用ProTaper锉临床折断情况分析

Clinical Analysis of the Separation of the Rotary ProTaper Nickel-Titanium Files during Root Canal Therapy

目的探讨机用ProTaper锉临床折断的特点,以期为临床治疗提供指导。方法收集患者500例,磨牙850颗,共2 750个根管,使用机用ProTaper锉进行根管预备。治疗后登记ProTaper锉使用次数,进行分类,根管显微镜下观察锉变形及折断情况并进行统计学分析。结果在预备40个根管前均无ProTaper锉发生变形与折断,折断与变形多发生于预备50个根管后,锉的折断率随预备根管数目的增多而增高,差异有统计学意义(P<0.05);4只常用ProTaper锉折断情况:F1最易折断,共6支,F2次之,S2最不易折断,差异有统计学意义(P<0.05)。6支ProTaper锉中S1最易发生肉眼可见的变形,F3次之,SX、S2、F1、F2显微镜下也不易发现明显的变形,差异有统计学意义(P<0.05)。结论机用ProTaper锉临床使用时多折断于根尖区3 mm,变形多发生在S1和F3,术前应仔细检查器械是否有肉眼可见的缺陷,并严格记录预备的根管数目。

Objective To analyze the characteristics of the separation of the rotary ProTaper Nickel-Titanium files.Methods In 4 years,2 750 root canals of 850 molars in 500 patients were instrumented by rotary ProTaper Nickel-Titanium files.After recording the times of application and classifying the used files,the separation and the distortion of the files were observed under dental microscope.Results All the root canal files had no separation and distortion before 40 root canals were instrumented.Most separation and distortion appeared after 50 root canals were instrumented.More canals were prepared,the rate of separate files were growed,the difference was significant（P0.05）.Among all files,totally 6 F1 files separated and was the easiest one.The next one is F2.S2 was the last one.The difference was significant（P0.05）.S1 was the easiest distorted among all the files by naked eyes.The next one is F3.SX,S2,F1,F2 weren＇t detected obvious distortion by dental microscope.The difference was significant（P0.05）.Conclusion The rotary ProTaper Nickel-Titanium files can prepare root canals effectively and safely.Meanwhile,the problem of instrument separation and distortion should be prevented.