云南地区人群下颌第一恒磨牙根管形态的锥形束CT分析

目的 利用锥形束CT (cone-beam computed tomography, CBCT) 观察分析云南地区人群下颌第一恒磨牙牙根和根管数目及其变异情况, 为牙髓治疗提供解剖学实验依据.方法 随机调取云南省口腔医院影像科300例患者共600颗下颌第一恒磨牙的CBCT影像资料, 统计分析下颌第一恒磨牙牙根和根管数目、远中舌根发生情况及根管形态.根管形态的分类依据Vertucci根管分类法.结果 在获得的600颗下颌第一恒磨牙中, 2根的发生率为71.2% (427/600) , 3根的发生率为28.8% (173/600) .2根管发生率为2.1% (13/600) , 3根管发生率为60.7% (364/600) , 4根管的发生率为36.8% (221/600) .近中根根管形态大多为Vertucci IV型, 远中根根管形态大多为Vertucci I型, 100%的远中舌根为VertucciⅠ型.远中舌根的人群发生率为33.7% (101/300) , 男性与女性的发生率差异无统计学意义 (P>0.05) .远中舌根的双侧对称发生率为71.3% (72/101) , 右侧发生率明显高于左侧, 差异有统计学意义 (P<0.05) .结论 云南地区人群下颌第一恒磨牙远舌根发生率较高, 右侧发生率明显高于左侧;CBCT易于根管形态的研究, 可以辅助牙髓治疗, 提高根管治疗成功率.

Cone-beam Computed Tomography in Evaluating the Root and Canal Morphology of Mandibular First Molars in Yunan Individuals

Objective To observe the number and variation of root and canal of mandibular first molar in Yunnan province by using cone-beam computed tomography (CBCT) , and to provide anatomical experimental basis for pulp treatment.Methods In this study, Cone-beam CT images were collected from 300 patients with a total of 600 mandibular first molars from imaging department of Yunnan Provincial Stomatological Hospital.The number of root and canals and the occurrence of distolingual root and the morphology of root canal were analyzed statistically.The root canal configurations were classified according to the method of Vertucci.Results CBCT image data of 600 mandibular first molars were obtained.The incidence of two-root was 71.2% (427/600) , and three-root was28.8% (173/600) .Two canals were found in 2.1% of mandibular first molars and 60.7% had three canals and36.8% had four canals.Most mesial roots were type IV configuration and most distal roots had a simple type I configuration and 100% of distolingual root was type Ⅰ.The incidence of distolingual root of population was 33.7% (101/300) .There was no significant difference between males and females (P>0.05) .71.3% (72/101) occurred bilaterally.The incidence of the right side of distolingual root was significantly higher than that on the left side (P<0.05) .Conclus ion The incidence of distolingual root is higher in the mandibular first permanent molar in Yunnan, and the incidence of right side is significantly higher than that of the left side. CBCT is easy to study the root canal, which can assist thetreatment of pulp and improve the success rate of root canal therapy.