应用锁相红外探伤法分析机用镍钛锉的疲劳抗性

Study on fatigue resistance of mechanical nickel-titanium files by phase-locked infrared flaw detection method

目的 :使用锁相红外探伤法检测机用镍钛锉的疲劳抗性,及时发现器械磨损情况,为临床安全使用并及时弃用镍钛锉提供参考。方法:选取Reciproc-Blue(RB)、MTWO和S3等3种机用镍钛锉各20套,分别预备60°和90°弯曲的树脂模拟根管,分为6个亚组。记录每组锉中25#锉使用后的疲劳值、折断前的使用次数及折断长度。采用SPSS26.0软件包对数据进行统计学分析。结果:随着使用次数的增加,3种锉的疲劳值逐渐增大。在2种弯曲根管中,RB组折断前使用次数较MTWO组和S3组显著增加(P<0.05)。3种锉在90°弯曲根管中使用次数均显著少于60°弯曲根管中相应各组使用次数(P<0.05),3种锉发生折断的长度相比无显著差异(P>0.05)。结论:锁相红外探伤法可对镍钛锉的疲劳程度进行无损检测并做定量分析。

PURPOSE:The fatigue resistance of mechanical nickel-titanium files was tested by phase-locked infrared flaw detection method,in order to timely detect instrument wear,providing reference for clinical safe use and timely abandonment of nickel-titanium files.METHODS:Twenty sets of mechanical nickel-titanium files were selected from Reciproc-Blue(RB),MTWO and S3 respectively,and resin simulated root canals with 60°and 90°bending were prepared,which were divided into 6 subgroups.The fatigue value after use,the number of uses before breaking and the length of fracture of file 25#of each group of files were recorded and compared with SPSS 26.0 software package.RESULTS:With the increase of the times of use,the fatigue value of the three kinds of files increased gradually.Among the two types of curved root canals,the number of uses before fracture in RB group was significantly increased compared with that in MTWO group and S3 group(P<0.05).The number of uses of the three kinds of files in the 90°curved root canal were significantly less than in the corresponding groups in the 60°curved root canal(P<0.05).There was no significant difference in the length of fracture among the three kinds of files(P>0.05).CONCLUSIONS:Phase-locked infrared flaw detection method can be used for non-destructive testing and quantitative analysis of the fatigue degree of nickel-titanium files.