显微CT法研究中国人上颌第二前磨牙分支根管解剖形态

Micro-computed tomography assessment of branch canal anatomy of Chinese maxillary second premolars

目的:应用显微CT扫描法研究中国人离体上颌第二前磨牙分支根管解剖形态。方法:收集100颗中国人上颌第二前磨牙,经显微CT扫描后构建根管系统三维可视化模型。观察并记录分支根管、根尖三角区发生情况,分析分支根管发生率、分布和开口特征。结果:共有86颗上颌第二前磨牙含有分支根管,发生率为86%;共记录到231个分支根管,其中93.94%发生于根尖1/3。分支根管开口于近中和远中方向的分别为27.71%和29%。根尖三角区的发生率为10%。结论:上颌第二前磨牙分支根管发生率高,根管系统形态复杂,了解其分支根管发生规律对于提高根管治疗成功率具有重要意义。

Objective： To investigate branch canal morphology in Chinese maxillary second premolars with microCT. Methods： One-hunderd maxillary second premolars were scanned by micro-CT and root canals were visualized by threedimentional reconstruction model. Branch canals and apical delta were recorded and incidence,distribution and exit opening direction of branch canals were analyzed. Results： Branch canals were recorded in eighty-six samples with an incidence of 86%. A total of 231 branch canals were recorded,93. 94% of branch canals located at the apical third. 27. 71% and 29%exit opening direction of branch canals were found at mesial and distal side,respectively. Incidence of apical delta was 10%.Conclusion： The root canal system of maxillary first premolars was complicated,with a high incedence of branch canals. It is crucial to get familiar with the branch canal morphology in order to improve the success rate of root canal treatment.