影响sc镍钛器械分离的相关因素分析

摘要 目的：分析影响sc镍钛器械分离的相关因素。方法：收集2020年1月至2022年4月在本院接受根管治疗的病例的离体牙。据研究目的和内容设计一般调查表收集临床资料。采用Schneider法测定根管弯曲度。结果：本次研究共收集到10047例病例，涉及22306个根管。其中236例病例（247根镍钛器械）发生器械分离，分离率为2.35%。其中有205例镍钛器械分离发生在磨牙，分离率为4.29%。有106例镍钛器械分离发生在上颌，分离率为1.83%；有130例镍钛器械分离发生在下颌，分离率为3.06%，两者相比差异具有统计学意义（x²=77.128，P<0.001）。轻度弯曲组镍钛器械分离率为0.32%，中度弯曲组镍钛器械分离率为1.04%，重度弯曲组镍钛器械分离组为3.46%，极重度弯曲组镍钛器械分离率为5.82%；随着根管弯曲度的增加，镍钛器械分离率呈明显上升趋势（z=291.883，P<0.001）。结论：sc镍钛器械分离率为2.35%，下颌磨牙根管预备中，器械分离发生率最高，根管弯曲度对器械分离发生也具有一定影响。

Influencing Factors of of sc Nickel-titanium Instruments Separation

ABSTRACT Objective: To analyze the influencing factors of of sc nickel-titanium instruments separation. Methods: The cases undergoing root canal therapy in the hospital were collected between January 2020 and April 2022. According to the research purpose and content, the general questionnaires were designed to collect clinical data. The root canal curvature was measured by Schneider method. The nickel-titanium instruments were scanned by scanning electron microscope. Results: In the 10,047 cases (22,306 root canals), there were 236 cases(247 nickel-titanium instruments) with instruments separation, and the separation rate was 2.35%. Among them, there were 205 cases with nickel-titanium instruments separation in molars, and the separation rate was 4.29%. there were 106 cases with nickel-titanium instrument separation in mandible, and the separation rate was 1.83%. There were 130 cases with nickel-titanium instrument separation in the maxilla, and the separation rate was 3.06%. The differences were statistically significant (x²=77.128, P<0.001). The separation rate of nickel-titanium instruments in mild bending group, moderate bending group, severe bending group and extremely severe bending group were 0.32%, 1.04%, 3.46% and 5.82%, respectively. With the increase of root canal curvature, separation rate of nickel-titanium instruments was significantly increased (z=291.883, P<0.001). Conclusion: The separation rate of sc nickel-titanium instruments is 2.35%. In root canal preparation of mandibular molar, the incidence of instrument separation is the highest. The curvature of root canals had certain effects on the occurrence of instruments separation.