应用CBCT对下颌第一恒磨牙近中中央根管发生率及其相关因素的研究  

Incidence and related factors of middle mesial canals in mandibular permanent first molars examined by CBCT

作　　者：王晨[1] 李彦青 王汝卉 杨勇 刘佼佼 WANG Chen;LI Yanqing;WANG Ruhui;YANG Yong;LIU Jiaojiao(Department of Stomatology,The Second People's Hospital of Dalian,116031,China;Xi'an Langli Aesthetic Surgery Clinic;Department of Stomatology,General Hospital of Northern Theater Command,Shenyang)

机构地区：[1]大连市第二人民医院口腔科,116031 [2]西安琅丽医疗美容门诊部 [3]北部战区总医院口腔科

出　　处：《实用口腔医学杂志》2020年第5期809-813,共5页Journal of Practical Stomatology

基　　金：辽宁省自然科学基金(编号:2019-ZD-1043)。

摘　　要：目的:采用CBCT评估下颌第一恒磨牙(MFM)近中中央根管(MMCs)的发生率及其相关因素。方法:纳入401例患者的802颗MFM,对存在MMCs的MFM近中根管系统分型;记录患者的年龄、性别、牙位、近颊(MB)与近舌(ML)根管之间是否存在根管峡区(RCIs)、MB与ML根管口之间距离以及根分叉下方1.5 mm处MMCs远中壁厚度,并进行统计学分析。结果:根管系统分型中,TypeⅪ(3-2)型占66.40%,TypeⅨ(3-1)型占29.00%,TypeⅧ(3-3)型占4.60%;MMCs发生率在≤40岁组为18.60%,>40岁组为7.50%(P<0.05);RCIs发生率为40.52%,有MMCs组为71.31%,无MMCs组为35.00%(P<0.05);有、无MMCs的MFM的MB-ML根管口之间距离分别为(2.97±0.85)和(3.52±0.11)mm(P<0.05);性别及牙位对MMCs发生率无影响;根分叉下方1.5 mm处MMCs远中壁厚度的平均值为(1.61±0.14)mm。结论:下颌第一恒磨牙近中中央根管大多以融合形式存在。MMCs发生率随年龄增高而降低,随MB-ML根管口之间的距离增加而降低,并且与RCIs的存在成正相关。Objective:To study the incidence and related factors of middle mesial canals(MMCs)in mandibular first molars(MFMs)by CBCT.Methods:802 MFMs from 401 outpatients were randomly selected.The mesial root canal systems with MMCs were classified.The age,sex,tooth position,root canal isthmi(RCIs),the distance between mesial buccal(MB)and mesial lingual(ML)and the orifice distance to periodontal ligament on distal side of the MMCs root were recorded.Results were statistically analyzed.Results:The ratio of TypeⅪ(3-2),TypeⅨ(3-1)and TypeⅧ(3-3)was 66.40%,29.00%and 4.60%respectively.The incidence of MMCs was 18.60%in the≤40-year-old group and 7.50%in the>40-year-old group respectively(P<0.05).The total incidence of RCIs was 40.52%,that was 71.31%in MMCs group and 35.00%in non-MMCs group(P<0.05).The distance between MB and ML was(2.97±0.85)mm in MMCs group and(3.52±0.11)mm in non-MMCs group(P<0.05).The differences in the distribution of MMCs between genders and between tooth position were not significant.The orifice distance to the periodontal ligament on the distal side of the MMCs root was(1.61±0.14)mm.Conclusion:The MMCs in MFM are mostly in the form of fusion.The incidence of the MMCs in MFMs decrease with age and the distance between MB and ML is positively correlated with the presence of RCIs.

关 键 词：CBCT 下颌第一恒磨牙(MFM) 近中中央根管(MMCs) 发生率 相关因素 

分 类 号：R781.05[医药卫生—口腔医学] R816.98[医药卫生—临床医学]