机用镍钛器械Mtwo及K3预备磨牙弯曲根管成形能力的比较  

Shaping ability of rotary nickel-titanium Mtwo versus K3 in severely curved root canals

作　　者：王丽娜[1] 刘启成[1] 傅康贵 史春[1] 牛卫东[1] 

机构地区：[1]大连医科大学口腔医学院,辽宁省大连市116044

出　　处：《中国组织工程研究》2015年第12期1827-1831,共5页Chinese Journal of Tissue Engineering Research

基　　金：国家自然科学基金(81171538)~~

摘　　要：背景:重度弯曲根管的预备是临床根管预备的难点,如预备不当容易出现台阶、根管偏移、根尖孔敞开等并发症,影响根充质量和根尖封闭性,因此选择切削能力和成形能力俱佳的根管预备器械对与弯曲根管预备效果的保证有着重要意义。目的:比较Mtwo、K3机用镍钛器械与不锈钢手动K-file预备磨牙重度弯曲根管的成形效果。方法:将30颗新鲜拔除的人离体上颌第一磨牙重度弯曲近颊根管随机均分为3组,分别采用Mtwo机用镍钛器械、K3机用镍钛器械与不锈钢手动K-file进行根管预备。记录3组根管预备前后根管影像中器械尖端所在位置,测量并比较3组间根管弯曲度的变化、工作长度变化和操作时间。结果与结论:根管预备前,3组根管弯曲度比较差异无显著性意义(P>0.05);根管预备后,Mtwo机用镍钛器械组、K3机用镍钛器械组根管弯曲度变化小于不锈钢手动K-file组(P<0.01),Mtwo机用镍钛器械组、K3机用镍钛器械组根管弯曲度变化比较差异无显著性意义(P>0.05)。3组根管预备时间比较差异有显著性意义(P<0.01),Mtwo机用镍钛器械组最短,不锈钢手动K-file组最长。3组根管预备后根管工作长度改变比较差异无显著性意义(P>0.05)。表明Mtwo与K3机用镍钛器械预备后牙弯曲根管时效率高、成形能力强。BACKGROUND：Severely curved root canal preparation is the difficulty during clinical root canal preparation, and improper preparation may induce complications such as stage, root canal offset and apical open, which affect the quality of root canal preparation and apical closure. Therefore, it is important to choose a root canal preparation instrument which has the best cutting and forming ability. OBJECTIVE： To compare the shaping ability of Mtwo nickel-titanium rotary instruments, K3 nickel-titanium rotary instruments and stainless steel K-files for the preparation of curved root canals. METHODS：A total of 30 severely curved root canals of freshly extracted human maxilary molars were randomly divided into three groups, with 10 canals in each group. The canals were prepared by Mtwo instruments, K3 instruments and K-files, respectively. The instrument’s tip location in pre- and post-instrumentation radiographs of the three groups was recorded; the changes of root curvature, working length and working time in the three groups were measured and compared. RESULTS AND CONCLUSION：The root curvature showed no significant difference in the three groups before preparation （P〉 0.05）. The changes of root curvature after root preparation in Mtwo instrument and K3 instrument groups were significantly less than that in K-files group （P 0.05）. The root canal preparation time in the three groups＆nbsp;showed significant differences （P 0.05）. Mtwo nickel-titanium rotary instruments and K3 nickel-titanium rotary instruments are have high efficacy and strong shaping ability in preparing curved root canals.

关 键 词：生物材料 口腔生物材料 机用镍钛器械 Mtwo K3 K-file 根管弯曲度 器械分离 根管预备时间 Crow-Down技术 根管成形 国家自然科学基金 

分 类 号：R318[医药卫生—生物医学工程]