中国实用口腔科杂志

中国实用口腔科杂志

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三种机用镍钛锉预备弯曲根管的中心定位能力比较研究

陈幸哲，顾敏   

  1. 苏州大学附属第三医院 常州市第一人民医院口腔科，江苏  常州  213003
  • 出版日期:2020-01-15 发布日期:2020-03-02
  • 基金资助:
    常州市科技局应用基础研究课题 （2015254）；常州市卫健委青年人才科技项目（QN201708）

  • Online:2020-01-15 Published:2020-03-02

摘要： 目的　评价M3-Pro 2018、M3-L铂金版及ProTaper universal三种机用镍钛锉预备弯曲根管的中心定位能力。方法　收集2018年10月至2019年3月在常州市第一人民医院口腔科拔除的上颌第一磨牙，筛选出30个近中颊根管弯曲度为20 ~ 40°的近中颊根，随机分成3组，分别为M3-Pro组、M3-L组和ProTaper组，每组10个样本，分别使用M3-Pro 2018机用镍钛锉、M3-L铂金版单支锉系统及ProTaper universal机用镍钛锉预备根管。各样本在处理前后均使用CBCT扫描并利用软件mimics17.0测算距根尖5 mm范围内每毫米处的根管偏移量及轴中心率。结果　距根尖1 mm区域，M3-Pro组、M3-L组和ProTaper组的根管偏移量均值分别为0.06、0.16和0.22 mm，轴中心率均值分别为0.86、0.71和0.49，3组间差异均有统计学意义（F值分别为3.404和3.499，均P < 0.05）。距根尖3 mm区域，M3-Pro组、M3-L组和ProTaper组的根管偏移量均值分别为0.13、0.19和0.26 mm，轴中心率均值分别为0.63、0.51和0.32，3组间差异均有统计学意义（F值分别为7.567和3.996，均P < 0.05）。进一步两两比较发现，距根尖1 mm和3 mm处M3-Pro组与ProTaper组的根管偏移量及轴中心率的差异有统计学意义（P < 0.05）；距根尖3 mm处M3-L组与ProTaper组的根管偏移量差异有统计学意义（P < 0.05），而两组的轴中心率差异无统计学意义（P > 0.05）。其余观测面上的根管偏移量和轴中心率在3组之间的差异均无统计学意义（均P > 0.05）。结论 M3-Pro 2018机用镍钛锉在弯曲根管的根尖区预备中能更好地顺应根管形状，减小根管偏移量，中心定位能力优于其他两种镍钛锉。

关键词: M3镍钛锉, 根管偏移量, 轴中心率, 弯曲根管, 中心定位能力

Abstract: Objective　To evaluate the center orientation of M3-Pro 2018，M3-L and ProTaper universal in the preparation of curved root canals. Methods　Totally 30 mesial buccal roots of the first maxillary molar  whose curvature was 20 - 40°were randomly divided into three groups with 10 in each group，namely group M3-Pro，group M3-L and group ProTaper. Three groups were prepared by M3-Pro 2018，M3-L and ProTaper universal，respectively. CBCT and mimics17.0 software were used to calculate the canal offset and center rate of each sample in the range of 5mm from the apex before and after preparation. Results　The average canal offset of group M3-Pro，group M3-L and group ProTaper at 1mm from apex were 0.06mm，0.16mm and 0.22mm，respectively. The average center rate of group M3-Pro，group M3-L and group ProTaper at 1mm from apex were  0.86，0.71 and 0.49，respectively. There was significant difference among the three groups（the corresponding values of F were 3.404 and 3.499，P < 0.05）. The average canal offset of group M3-Pro，group M3-L and group ProTaper at 3mm from apex were  0.13mm、0.19mm、0.26mm，respectively. The average center rate of group M3-Pro，group M3-L and group ProTaper at 3mm from apex were 0.63、0.51、0.32，respectively. There was significant difference among the three groups（the corresponding values of F were 7.567 and 3.996，P < 0.05）. Further pairwise comparisons revealed that there was significant difference between group M3-Pro and group ProTaper at 1mm and 3mm from apex in the aspect of canal offset and center rate（P < 0.05）. There was significant difference between group M3-L and group ProTaper at 3mm from apex in the aspect of canal offset（P < 0.05），while there was no significant difference between these two groups concerning the center rate（P > 0.05）. There was no significant difference among the 3 groups in the aspect of canal offset and center rate in other observation area except the area 1 mm and 3 mm from the apex（P > 0.05）. Conclusion　M3-Pro 2018 complys with the canal well；it can reduce the canal offset and its ability of center orientation is better than the other two instruments in the preparation of curved canals.

Key words: M3 instruments, canal offset, center rate, curved canal, center orientation