Abstract:

Objective    To compare the filling effect of different combinations of preparations and filling methods in apical isthmus. Methods    Totally 60 extracted maxillary first premolars with single straight root and two canals were selected.The teeth were divided into four groups randomly（15 cases in each group）. Group A：prepared with ProTaper and filled with continuous-wave condensation technique；group B：prepared with ProTaper and filled with cold lateral condensation technique；group C：prepared by step-back technique with K-files and filled with continuous-wave condensation technique；group D：prepared  with K-files and filled with cold lateral condensation technique. Then roots were sectioned at 1mm interval within 5mm from apex to coronal，which were observed under microscope and scored. The results were analyzed statistically with SPSS 17.0 software package. The testing criteria was α=0.05. Results    Group C shows the worst filling effect in the apical isthmus （P < 0.05），and there was no difference among the other groups （P > 0.05）.Conclusion    The combination of K-files with continuous-wave condensation technique is not proper for the filling in apical isthmus.

Key words: canal isthmus, root canal preparation, warm gutta-percha, cold lateral compaction

摘要：

目的    比较不同预备和充填方法组合对根管峡区的充填效果。 方法    选取2014年12月至2015年6月中国医科大学附属口腔医院口腔外科门诊患者因正畸治疗拔除的上颌前磨牙60颗，随机分为4组，每组15颗。A组：采用机用ProTaper镍钛锉根管预备+连续波热牙胶充填；B组：采用机用ProTaper镍钛锉根管预备+冷侧压充填；C组：采用不锈钢K锉根管预备+热牙胶充填；D组：采用不锈钢K锉根管预备+冷侧压充填。各组牙齿充填完成后将根尖5 mm内牙根垂直牙长轴每隔1 mm切片，放在显微镜下观察记分。采用SPSS 17.0统计软件比较分析各组间的差异，检验水准α=0.05。 结果    C组在根管峡区充填效果最差，与A、B、D组之间比较差异均有统计学意义（P < 0.05），A、B、D组充填效果两两之间比较差异均无统计学意义（P > 0.05）。结论    不锈钢K锉和热牙胶连续波充填技术组合不适合根管峡区的充填。

关键词: 根管峡区, 根管预备, 热牙胶, 冷侧压