22例维吾尔族上颌第一磨牙根管系统的三维影像分析

摘要

AIM:To investigate the morphological characteristics of root canal system of the maxillary first molars of Uygur subjects.METHODS:22 extracted maxillary first molars of Uygur subjects were collected,scanned and 3D reconstructed by Micro -CT.The classification of root canal,distribution and the incidence of accessory canals were observed according to Vertucci's classification.RESULTS:1 tooth was with 4 roots,Ⅰ,Ⅱ,Ⅳ,Ⅵ and Ⅷ root canal system were in 4(1 9%),3(1 4%),3(1 4%),7(33%),2(1 0%)and 2(1 0%)of the 21 teeth with 3 roots .In-cidence of MB2 was 57% ,most of them located in the mesio -buccal side of the MB -P .The mean distance of MB -MB2 was 2.1 2 ±1 .29 mm.Incidence of accessory canal in the MBR was 67%.Among them,lateral canals were the highest(57%)at the apical of root canal.CONCLUSION:The root canal system,especially the MBR,of maxillary first molars of Uygur subjects is complicated,which will increase the difficulty of root canal therapy.%目的：观察维吾尔族人上颌第一磨牙根管系统形态特征。方法：收集维吾尔族人离体上颌第一磨牙22个，进行 Micro －CT 扫描和三维重建，根据 Vertucci 分类法观测根管系统分型、侧副根管分布及发生率。结果：22个上颌第一磨牙中1个牙有4根，21个牙有3根，Ⅰ、Ⅱ、Ⅳ、Ⅴ、Ⅵ、Ⅷ型根管的牙数分别为4（19％）、3（14％）、3（14％）、7（33％）、2（10％）、2（10％）；MB2检出率为57％，多位于 MB －P 连线近中偏颊侧，MB －MB2距离为（2．12±1．29）mm。近颊根侧副根管达67％，其中根尖侧支最高为57％。结论：维吾尔族人上颌第一磨牙根管系统，尤其是近中颊根根管形态复杂，临床治疗难度较大。