昆明地区人群下颌磨牙根管系统的CBCT研究

A Retrospective CBCT Analysis of the Characteristics of Root Canal Systems of Mandibular Molars in a Kunming Population

目的回顾性分析昆明地区人群下颌第1和第2磨牙根管系统的CBCT资料,研究其根管形态的规律。方法收集云南省第一人民医院口腔医学中心358名患者总共1 229颗下颌第1和第2磨牙的CBCT资料,计算根管数量和类型、远舌根管和C形根管发生率,分析根管形态特征。结果下颌第1磨牙73.96%为4根管,19.73%为3根管,4.48%为5根管,0.33%为2根管,远舌根平均发生率为14.43%。下颌第2磨牙C形根管平均发生率为30.83%,女性高于男性(34.95%> 26.81%,P <0.05),牙位或各年龄间无显著性差异(P> 0.05)。C形根管在根管口水平面81.35%表现为C1和C2型,根中水平70.47%为C2和C3型,根尖3 mm水平83.42%为C3和C4型。结论昆明地区人群下颌第1磨牙远舌根管和第2磨牙C形根管发生率较高,治疗时需特别注意。

Objective To investigate the characteristics of root canal system of mandibular first and second molars ina Kunming population with cone-beam computed tomography technology.Methods CBCT dada of 1229 mandibular first and second molar from 358 patients were collected.The root canal number,classification and incidence of radix entomolaris and C-shaped canalswere calculated to conclude their characteristics.Results The majority of mandibular first molars(73.96%)showed 4 canals,19.73%with 3 canals,4.48%with 5 canals,0.33%with 2 canals.The incidence of radix entomolaris was 14.43%.The incidence of C-shaped canals in mandibular second molars was 30.83%.There was a significant difference of incidence in female than that in male(34.95%>26.81%,P<0.05).The incidence of C-shaped canals in group 1 and 2 was higher than that in group 3 and 4(P<0.05).Most of the C-shaped canals were C1 and C2 type at the level of orifice(81.35%),70.47%being C2 and C3 type at the level of middle and 83.42%being C3 and C4 type at the level of apical 3 mm.Conclusion More attention must be paid when treating mandibular first and second molars in Kunming population bucause there is a high incidence of radix entomolaris and C-shaped canal.