【摘要】 目的:评估M3-Pro机用镍钛锉预备弯曲根管后的器械损伤情况,为临床安全使用M3-Pro机用镍钛锉提供理论依据和实验参考。方法:选用M3-Pro机用镍钛锉13套,随机分为A组6套,B组6套,对照组1套。A组预备离体牙中度弯曲根管,B组预备离体牙重度弯曲根管。每预备1个根管后,在体式显微镜下观察并记录镍钛锉表面损伤情况,并与新镍钛锉进行比较。结果:A组6套镍钛锉,分别在使用15～24次后出现器械损伤,13支出现缺损或螺纹变形,其中Mpathy锉和MP-1锉的损伤率占84.6%,均未发生器械分离。B组6套镍钛锉,分别在使用9～15次后出现器械损伤,18支出现缺损或螺纹变形,1支发生器械分离,其中MOP、Mpath y和MP-1的损伤率占84.2%。结论:建议使用M3-Pro机用镍钛锉预备中度弯曲根管的使用次数不超过15次,预备重度弯曲根管的使用次数不超过9次。使用后重点检查MOP、Mpath y和MP-1的锉尖3～5mm位置,及时发现损伤,以减少器械分离的发生。更多还原

【Abstract】 Objective: To evaluate the device damage after preparing curved root canal with M3 Pro Ni-Ti file, and to provide theoretical basis and experimental reference for clinical safe use of M3 Pro Ni-Ti file. Methods: 13 sets of M3 Pro Ni-Ti files were selected and randomly divided into 6 sets in group A, 6 sets in group B and 1 set in control group. In group A, moderately curved root canals were prepared, while in group B, severely curved root canals were prepared. After preparing one root canal, the surface damage of Ni-Ti file was observed and recorded under asana microscope, and compared with that of new Ni-Ti file. Results: In group A, 6 sets Ni-Ti files were damaged after 15-24 times of use, 13 of them were damaged or deformed. Among them, the damage rate of Mpathy file and MP-1 file accounted for 84.6%, and no separation occurred. In group B, 6 sets Ni-Ti files were damaged 9-15 times after use, 18 of them were damaged or deformed, and one of them was separated from the other. The damage rate of MOP, Mpathy and MP-1 accounted for 84.2%. Conclusion: It is suggested that the use of Ni-Ti file for preparing moderately curved root canal should not exceed 15 times, and the use of Ni-Ti file for preparing severely curved root canal should not exceed 9 times. After use, it is important to check the 3-5 mm position of the file tips of MOP, Mpathy and MP-1, find out the damage in time, so as to reduce the occurrence of device separation.更多还原