中国实用口腔科杂志

中国实用口腔科杂志

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两种镍钛根管再治疗器械与System B携热器联合应用去除根管内充填物效果评价

吴洪斌，吴    迪，孙德刚   

  1. 青岛市口腔医院牙体牙髓科，山东  青岛  266000
  • 出版日期:2015-07-15 发布日期:2015-07-22

  • Online:2015-07-15 Published:2015-07-22

摘要：

目的    评价两种镍钛根管再治疗器械与System B携热器联合使用去除根管内充填物的效果。方法    收集2014年3月至2015年1月青岛市口腔医院口腔颌面外科因正畸减数拔除的单根下颌前磨牙80颗，采用K3机用镍钛锉冠向下法预备根管、连续波热牙胶垂直加压技术充填后随机均分为4组，分别用ProTaper Universal再治疗锉和Mtwo-R再治疗锉在不使用和使用System B携热器情况下去除根管内牙胶充填材料，记录到达工作长度的时间（T1）、预备完成所用总时间（T2）；矢状劈开样本，体视显微镜下评价根管壁清洁度。结果    无论联合应用System B携热器与否，均为使用Mtwo-R再治疗锉的T1和T2短于ProTaper Universal再治疗锉（均P < 0.05）；两种镍钛器械联合使用System B携热器的T1和T2明显短于不用System B携热器（均P < 0.05）。各组器械使用与不使用System B携热器根管壁清洁度差异无统计学意义（均P > 0.05）。结论    根管再治疗时配合使用System B携热器可提高机用镍钛器械工作效率，但不能提高根管壁的清洁度。使用Mtwo-R再治疗锉工作效率优于ProTaper Universal再治疗锉。

关键词: 机用镍钛再治疗器械, 根管再治疗, System B携热器

Abstract:

Objective    To evaluate the efficacy of two nickel-titanium （Ni-Ti） instruments for root canal retreatment with or without System B heat carrier tips in removing filling material in root canals. Methods    Totally 80 extracted single-canal mandibular premolars were shaped using the K3 Ni-Ti rotary instruments with the Crown-Down technique. All teeth were obturated by the continuous wave of condensation technique and randomly divided into 4 groups. Removal of gutta-percha was performed with ProTaper Universal retreatment files and Mtwo-R respectively. All techniques were used with or without System B heat carrier tips respectively. Following data were recorded：time to reach the working length（T1） and time required for the removal of gutta-percha（T2）. Then the teeth were vertically split and the cleanliness of the root canal walls was evaluated. Results    In the groups with or without System B heat carrier tips T1 and T2 were the least（P < 0.05）in Mtwo-R groups. In Mtwo-R and ProTaper Universal groups with System B heat carrier tips T1 and T2 were less than those without System B heat carrier tips（P < 0.05）. The differences of cleanliness of the root canal walls were not significant in all groups with or without System B heat carrier tips（P > 0.05）. Conclusion    System B heat carrier tips may be of some help in increasing the speed of removal of gutta-percha from root canal，but can not improve the canal cleanliness in the application of Mtwo-R and ProTaper Universal retreatment instruments. Mtwo-R groups have better work efficiency than ProTaper Universal groups.

Key words: Ni-Ti rotary retreatment instrument, root canal retreatment, System B heat carrier tips