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  

Effectiveness of two nickel-titanium instruments for root canal retreatment in removing filling material in root canals with or without System B heat carrier tips in vitro

作　　者：吴洪斌 吴迪 孙德刚 

机构地区：[1]青岛市口腔医院牙体牙髓科,山东青岛266000

出　　处：《中国实用口腔科杂志》2015年第7期423-426,共4页Chinese Journal of Practical Stomatology

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Pro Taper 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Pro Taper 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Pro Taper Universal再治疗锉。ObjectiveTo 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.MethodsTotally 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 Pro Taper 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.ResultsIn 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 Pro Taper 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）.ConclusionSystem 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 Pro Taper Universal retreatment instruments.Mtwo-R groups have better work efficiency than Pro Taper Universal groups.

关 键 词：机用镍钛再治疗器械 根管再治疗 SYSTEM B携热器 

分 类 号：R78[医药卫生—口腔医学]