ProTaper锉预备S形弯曲模拟根管形态变化的连续观察

Continuous observation of canal aberrations in S-shaped simulated root canal prepared by hand-used ProTaper files

目的:观察手用ProTaper各号锉在预备S形树脂模拟根管中,不良根管形态在根管预备各阶段的产生情况。方法:选用15个S形树脂模拟根管,分别用手用ProTaper的各号锉按使用说明书进行预备,采集并储存S1,S2,F1,F2和F3预备完后的根管图像,将其依次分为S1、S2、F1、F2和F3组。将同一根管在各组的图像分别与其未预备的根管图像进行重叠,观察各组根管不良形态(包括危险区,台阶,肘形,根尖拉开,侧穿,未预备区域)产生的例数和种类。采用SPSS12.0软件包对结果进行四格表Fisher确切概率法检验。结果:未预备区域的面积在预备过程中逐渐减小,但直到预备完成,未预备区域仍然存在。危险区、肘形和根尖拉开的发生率在修形锉预备初(F1组)分别为15/15、11/15、4/15,显著高于在成形锉预备末(S2组)(分别为2/15、0/15、0/15)(P<0.001);直到F2组开始有台阶的产生,F3组台阶的出现显著增高;各组均未观察到侧穿的发生。结论:手用ProTaper锉预备S形树脂模拟根管,根管不良形态主要始于修形锉预备后;未预备区域的始终存在,提示在根管预备过程中使用大量冲洗液冲洗和在预备后的根管内封药是十分必要的。

PURPOSE： To observe the formation of canal aberrations in S-shaped root canals prepared by every file of hand-used ProTaper.METHODS： Fifteen S-shaped simulated resin root canals were selected.Each root canal was prepared by every file of hand-used ProTaper following the manufacturer instruction.The images of canals prepared by S1,S2,F1,F2 and F3 were taken and stored,which were divided into group S1,S2,F1,F2 and F3.One image of canal unprepared was superposed with the images of the same root canal in these five groups respectively to observe the types and number of canal aberrations,which included unprepared area,danger zone,ledge,elbow,zip and perforation.SPSS12.0 software pakage was used for Fisher’s exact probabilities in 2×2 table.RESULTS： Unprepared area decreased following preparation by every file of ProTaper,but it still existed when the canal preparation was finished.The incidence of danger zone,elbow and zip in group F1 was 15/15,11/15,4/15,respectively,which was significantly higher than that in group S2（2/15,0,0）（P〈0.001）.Ledge appeared after prepared by F2,and increased sharply in group F3.None perforation was found in all groups.CONCLUSIONS： The incidence of canal aberrations begins to increase after prepared by finishing files of ProTaper.The presence of unprepared area suggests that it is essential to rinse canal abundantly during complicated canal preparation and canal antisepsis after preparation.