上颌第三磨牙根管形态的CBCT研究

目的：应用锥形束CT（cone?beam computed tomography ，CBCT）技术研究上颌第三磨牙的根管形态，为临床治疗提供解剖学依据。方法随机调取397颗上颌第三磨牙的CBCT资料，分析上颌第三磨牙的牙根数目、根管数目、根管分类等。结果397颗上颌第三磨牙中，三根牙最多，占43.07%；融合根牙次之，占40.30%。分析根管数目显示，三根管最多，占47.86%；单根管次之，占28.21%。根据Vertucci根管分类，89.6%的牙根以Ⅰ型根管为主，但仍会出现根管治疗时较难操作的Ⅱ型、Ⅲ型、Ⅴ型、其他型等根管。结论上颌第三磨牙根管解剖形态多样，根管系统复杂、变异大。

A study of root canal morphology in maxillary third molars using cone-beam computed tomography

Objective This study investigated root canal morphology in maxillary third molars by CBCT to provide an anatomical guideline for clinical treatment. Methods CBCT images of 397 maxillary third molars were collected. The root canal morphology was analysed, including the number of roots and the type of canals. Results In 397 maxil?lary third molars, three roots were the most frequently type, accounting for 43.07%and the fused root teeth were the sec?ond, accounting for 40.30%. For the root canal type, three canals were the most common, accounting for 47.86%, fol?lowed by single canal, accounting for 28.21%. According to the Vertucci root canal classification, 89.6%of the root ca?nals were typeⅠ, the rest were typeⅡ, typeⅢ, typeⅤ, and other types of root canals which were difficult to deal with in clinical treatment. Conclusion The root canal morphology of the maxillary third molar is various and the root canal system was complicated.