锥体束CT对维吾尔族成人上颌第一磨牙牙根及根管形态的研究

The morphology of maxillary first molars and root canals in Uyghur adults examined by cone-beam computed tomography

目的:通过锥体束CT(CBCT)成像系统分析新疆维吾尔族成人上颌第一磨牙形态特征和上颌第一磨牙近中颊根根管形态及第二根管(MB2)的发生率。方法:选择体检且上颌牙列完整的100名维吾尔族成人进行CBCT扫描,测量双侧上颌第一磨牙牙根的长度,观察髓底形态、近颊根根管形态,按照Jin Hee Lee评价标准进行分类。统计MB2根管的发生率及男女发生比率差异。结果:200颗上颌第一磨牙中3根3根管者154颗(77%),3根4根管42颗(21%),3根5根管2颗(1%),4根6根管和7根管各1颗(各0.5%)。近颊根管形态以Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ型各占77%,13.5%、9%、0和0.5%男性和女性MB2根管发生率分别为22.32%和21.2%(P=0.901)。结论:维吾尔人上颌第一磨牙MB2发生率约22%,无性别差异,其形态以Ⅰ型为主。

Objective：To analyze the morphological characteristics of maxillary first molars,mesiobuccal roots and the incidence of second mesiobuccal（MB2） roots in Uyghur adults.Methods：100 Uyghur adults with full dentition were included.The morphology of maxillary first molars and root canals were examined by cone beam computerized tomography（CBCT）.The prevalence of MB2 and the difference between sexes were analysed.Results：Among 200 maxillary first molars,154（77%） teeth were with 3 roots and 3 canals,42（21%） with 3 roots and 4 canals,2（1%） with 3 roots and 5 canals,1（0.5%） was with 4 roots and 6 canal,1（0.05%）with 4 roots and 7 canal.The percentage of typeⅠ,Ⅱ,Ⅲ,Ⅳand Ⅴ mesiobuccal roots was 77.0,13.5,9.0,0 and 0.5 respectively.The prevalence of MB2 was 22.32%in male and 21.2%in female（P =0.901）.Conclusion：The prevalence of MB2 in Uyghur adults is about 22%and the predominant morphology of maxillary first molarsmesiobuccal roots was type I.