新疆维吾尔族成人下颌第一前磨牙根管的形态分析

Analysis of Canal Morphology of Mandibular First Premolar in Uighur Population of Xinjiang

目的：采用锥形束CT探讨新疆维吾尔族成人双侧下颌第一前磨牙根管的解剖形态。方法：选100例双侧下颌第一前磨牙的CBCT扫描数据,分析其根管数目及形态、双侧根管对称性、两根管口间的距离和多根管分叉位置,以Vertucci根管分型为标准对根管形态进行分型。结果：下颌第一前磨牙不同根管类型发生率分别为Ⅰ型76.5%,Ⅳ型8.5%,Ⅱ型6%,Ⅴ型4%,Ⅲ型3.5%,C形1.5%;两根管口间距离集中在1~3mm,根管双侧对称性为85%。下颌第一前磨牙多根管发生率与性别有相关性（P=0.02）,而左、右两侧下颌第一前磨牙多根管发生率无差异。结论：下颌第一前磨牙根管解剖结构复杂,多根管发生率超过20%,CBCT可为根管系统提供准确依据。

Objective： To investigate the canal morphology of bilateral mandibular first premolars in Uighur popu- lation of Xinjiang using cone--beam computed tomography （CBCT）. Methods： A total of 200 CBCT images of man- dibular first premolars were obtained from 100 patients. Tooth position, root canal morphology, symmetry of bilat- eral mandibular first premolars, and the distance between the 2 root canal orifices of mandibular first premolars were investigated. The classifications of the root canal types were according to Vertucci＇s type. Results： 1.5% （n=3） of the teeth had a C--shaped root canal system, 76.5% （n=153） had 1 root canal, and 22% （n=44） had 2 root canals from type II to type V. The distance between the 2 root canal orifices of mandibular first premolars was ap- proximately 1--3 mm, and the symmetry in all types of canal classification of mandibular first premolar was 85%. Conclusion： CBCT can provide accurate information of canal system. More than 20% of mandibular first premolars had complex root canal systems showing multi--canal or double root canals.