22例维吾尔族上颌第一磨牙根管系统的三维影像分析

Three-dimensional analysis of root canal system of the maxillary first molars of Uygur subjects

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。

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 Vertuccit classification. RESULTS： 1 tooth was with 4 roots,Ⅰ,Ⅱ,Ⅳ,Ⅴ,ⅥandⅧ root canal system were in 4（ 19% ） ,3 （ 14% ） ,3 （ 14% ） ,7 （33%） ,2（ 10% ） and 2 （ 10% ） 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 2.12 ± 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.