摘要
目的了解下颌管分支的发生率、直径、角度和其大致形态位置分布,为临床提供参考。方法选取下颌管锥形束CT(cone-beam computed tomography,CBCT)影像学资料500例观测下颌管分支发生率及类型并进行回顾性分析。依据Naitoh的分型将下颌管分支分为4类:Ⅰ类是磨牙后管,Ⅱ类是根尖下管,Ⅲ类是前行管,Ⅳ类是颊舌向管,对各类型分支与其主干直径关系和夹角进行分析。结果 500例患者的1 000侧下颌骨中,190例患者共322侧下颌骨中观测到下颌管分支,其中,各类型发生率分别为52.17%,36.03%,6.21%,5.59%。下颌管分支的直径大于或等于主干1/2的有90例;少于主干1/2的有100例。下颌管分支与主干间的夹角:Ⅰ、Ⅱ、Ⅲ型夹角的均值分别为50.21°±22.25°、28.81°±11.5°和13.50°±2.39°。结论通过CBCT可观测到较高的下颌管分支检出率,最常见的是磨牙后管,在施行下颌手术前可首选CBCT仔细评估该部位的解剖结构。
Objective To investigate the prevalence of bifid mandibular canals(BMC),and to measure their diame-ter and angle.Methods CBCT images of 500 patients were used for this study.The incidence and types of bifid man-dibular canals were recorded according to a modified classification of Naitoh:Ⅰ,retromolar canal;Ⅱ,dental canal;Ⅲ,forward canal;Ⅳbuccolingual canal.The diameter and angle between the accessory canal and the main mandibular ca-nal were recorded.Results Bifid mandibular canals were found in 32.2%of the 1 000 hemi-mandibles,with the inci-dence rate of 52.17%,36.02%,6.21%,5.59%in TypeⅠ,Ⅱ,Ⅲ,Ⅳrespectively.There are 90 cases of the mandibular branch with a diameter greater than or equal to the backbone 1/2,and 100 cases that are less than 1/2 of the backbone.The angle between the mandibular branch and the trunkⅠ,ⅡandⅢwere 50.21°±22.25°、28.81°±11.5°and 13.50°±2.39°respectively.Conclusion Bifid mandibular canals were observed at a relatively high incidence using CBCT,and the most common type was the retromolar canal.It is suggested CBCT should be taken before mandibular surgery to give an accurate evaluation of bifid mandibular canals.
作者
戴昱
张国志
孙海鹏
DAI Yu;ZHANG Guozhi;SUN Haipeng(Department of Stomatology,The second clinical Medical College of Ji’nan University&Shen.zhen People’s Hospital,Shenzhen 518020,China)
出处
《口腔疾病防治》
2018年第2期113-116,共4页
Journal of Prevention and Treatment for Stomatological Diseases
基金
深圳市科技计划项目(JCYJ20160422154812784)
关键词
锥体束CT
下颌神经
下颌神经管
分支
影像
Conebeam computed tomography
Mandibular nerve
Mandibular nerve canal
Bifid
Radiogra.phy
