国际口腔医学杂志 ›› 2022, Vol. 49 ›› Issue (4): 420-425.doi: 10.7518/gjkq.2022020

• 论著 • 上一篇    下一篇

海口地区下颌第一恒磨牙近中中央根管发生率及相关因素

吴文智(),冯达兴,陈垂壮,周丽鹃   

  1. 海南医学院第二附属医院口腔科 海口 570100
  • 收稿日期:2021-11-16 修回日期:2022-03-09 出版日期:2022-07-01 发布日期:2022-06-28
  • 通讯作者: 吴文智
  • 作者简介:吴文智,主治医师,学士,Email: wuwz9878@126.com

Incidence and related factors of middle mesial canals in mandibular first molars in Haikou

Wu Wenzhi(),Feng Da-xing,Chen Chuizhuang,Zhou Lijuan.   

  1. Dept. of Stomatology, The Second Affiliated Hospital, Hainan Medical College, Haikou 570100, China
  • Received:2021-11-16 Revised:2022-03-09 Online:2022-07-01 Published:2022-06-28
  • Contact: Wenzhi Wu

摘要:

目的 评估海口地区人群下颌第一恒磨牙近中中央根管(MMCs)发生率及其影响因素。方法 回顾分析2018年1月—2020年12月1 032例患者的1 964颗下颌第一恒磨牙锥形束CT的影像资料,观察其近中根管的形态特点,统计MMCs的发生率,收集记录患者的年龄、性别、民族、居住环境、牙位、近颊(MB)-近舌(ML)根管口间距、根管峡区(RCIs)等信息,并对影响因素进行logistic回归分析。结果 海口地区人群下颌第一恒磨牙MMCs发生率为22.3%,以附加型(3-2)为主(63.8%),RCIs发生率为50.5%,经logistic回归分析显示年龄≤40岁(OR=2.667,95%CI:1.185~6.004),居住城市(OR=1.456,95%CI:1.036~2.048),合并RCIs (OR=3.808,95%CI:1.353~10.718),MB-ML根管口间距<3 mm(OR=3.374,95%CI:1.168~9.741),均是第一恒磨牙发生MMCs的独立危险因素。结论 海口地区第一恒磨牙MMCs发生率较高。年龄≤40岁、居住城市、合并RCIs、MB-ML根管口间距<3 mm均是第一恒磨牙发生MMCs的独立危险因素。

关键词: 下颌第一恒磨牙, 近中中央根管, 锥形束CT, 相关因素

Abstract:

Objective This study aimed to evaluate the incidence of middle mesial canals (MMCs) in mandibular first molar in Haikou and analyse the related factors. Methods The cone-beam computed tomography images of 1 964 mandibular first molars from 1 032 patients from January 2018 to December 2020 were retrospectively analysed. The morphological characteristics of mesial root canals were observed, and the incidence of MMCs was analysed. The age, sex, ethnicity, living environment, tooth position, distance between mesial buccal (MB) and mesial lingual (ML) root canal orifi-ces and existence of root canal isthmus (RCIs) were collected and recorded. Logistic regression analysis was performed on the related factors of MMCS. Results The incidence of MMCs in mandibular first molars was 22.3% in Haikou, and the additional type (3-2) was the most common type of MMCs, accounting for 63.8%. The incidence of RCIS was 50.5%. Multivariate logistic analysis showed that patients ≤40 years old (OR=2.667, 95%CI: 1.185-6.004), city residence (OR=1.456, 95%CI: 1.036-2.048), accompanied by RCIs (OR=3.808, 95%CI: 1.353-10.718), distance between MB-ML root canal orifices<3 mm (OR=3.374, 95%CI: 1.168-9.741) were independent risk factors for MMCs in mandibular first molars. Conclusion The incidence of MMCs in mandibular first molars in Haikou is relatively high, and the independent risk factors for MMCS were ≤40 years old, city residence, accompanied by RCIs and distance between MB-ML root canal orifices<3 mm.

Key words: mandibular first molar, middle mesial canal, cone-beam computed tomography, related factors

中图分类号: 

  • R 781

图1

下颌第一恒磨牙近中根管系统分型左:Ⅷ型(3-3);中:附加型(3-2);右:附加型(3-1)。"

图2

MMCs的典型CBCT图像左:MMCs横断面;右:MMCs冠状面;箭头示 MMCs。"

表 1

MMCs发生影响因素的单因素分析 (n(%))"

项目MMCs组非MMCs组χ2P
性别0.5140.474
232(53.1)781(51.1)
205(46.9)746(48.9)
年龄/岁10.1750.001
≤40331(75.7)1 035(67.8)
>40106(24.3)492(32.2)
民族3.4710.176
汉族273(62.5)878(57.5)
黎族102(23.3)406(26.6)
苗族62(14.2)243(15.9)
居住环境5.5570.018
城市304(69.6)969(63.5)
农村133(30.4)558(36.5)
牙位2.2890.130
232(53.1)748(49.0)
205(46.9)779(51.0)
MB-ML根管口间距/mm12.5780.000
<3238(54.5)685(44.9)
≥3199(45.5)842(55.1)
RCIs7.5220.006
246(56.3)746(48.9)
191(43.7)781(51.1)

表 2

MMCs发生影响因素的变量及赋值方法"

变量定义量化值
10
X1年龄/岁≤40>40
X2居住环境城市农村
X3MB-ML根管口间距/mm<3≥3
X4RCIs

表 3

MMCs发生影响因素的logistic回归分析"

患病因素回归系数标准误WaldPOR95%CI
年龄≤40岁0.9810.4145.6150.0192.6671.185~6.004
居住城市0.3760.1744.6690.0321.4561.036~2.048
MB-ML根管口间距<3 mm1.2160.5415.0520.0253.3741.168~9.741
合并RCIs1.3370.5286.4120.0123.8081.353~-10.718
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