Int J Stomatol

Int J Stomatol ›› 2022, Vol. 49 ›› Issue (4): 420-425.doi: 10.7518/gjkq.2022020

• Original Articles • Previous Articles     Next Articles

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 E-mail:wuwz9878@126.com

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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

CLC Number: 

  • R 781

TrendMD: 

Fig 1

Mesial root system classification of mandibular permanent first molars"

Fig 2

Typical CBCT images of MMCs"

Tab 1

Univariate analysis of influencing factors of MMCs"

项目MMCs组非MMCs组χ2值P值
性别0.5140.474
男232（53.1）781（51.1）
女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
左232（53.1）748（49.0）
右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
有246（56.3）746（48.9）
无191（43.7）781（51.1）

Tab 2

Variable assignment method of MMCs occurrence influencing factors"

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有无

Tab 3

Logistic regression analysis of influencing factors of MMCs"

患病因素回归系数标准误WaldP值OR95%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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