CBCT法研究上颌第一磨牙根管形态

目的：探讨应用锥形束CT研究上颌第一磨牙牙根及根管形态的价值。方法选取70例患者83颗上颌第一磨牙的锥形束CT（cone beam computed tomogaphy,CBCT）影像，分析其牙根数目、根管数目及根管系统的解剖结构。参照Vertucci分类法对根管形态进行分类，统计近中颊根第二根管（the seconal mesiobuual canal, MB2）率。结果83颗上颌第一磨牙均为3个独立牙根，其中MB2的发生率为38.6%，近中颊根根管VertucciⅠ型（1?1）、Ⅳ型（2?2型）、Ⅱ型（2?1）、Ⅲ型（1?2?1）所占百分比分别为61.4%、18.1%、15.7%和4.8%。结论上颌第一磨牙根管系统复杂，CBCT影像可反映真实根管形态，为根管治疗提供参考。

Cone beam computed tomography study of the root canal morphology of maxillary first molars

Objective To study the value of the application of cone beam CT on the research of root canal morphol?ogy of maxillary first molars. Methods Eighty?three maxillary first molars of 70 patients were randomly selected in this study. All teeth were examined for morphology of roots and root canals by cone beam computed tomography (CBCT). The root canals configuration was classified using Vertucci??s classification. The incidence of second mesiobuccal canal (MB2) was calculated. Results All of the maxillary first molars had three separated roots. The incidence of MB2 canal was 38.6%. In the mesiobuccal roots, the most common Vertucci classifications of canal types were typeⅠ(1?1, 61.4%), typeⅣ(2?2, 18.1%), typeⅡ(2?1, 15.7%), typeⅢ(1?2?1, 4.8%). Conclusion The root canal system of maxillary first molars is complicated. CBCT images can facilitate the identification of root canal and provide reference for the root ca?nal treatment.