Department of Endodontics, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran.
School of Dentistry, Dental Sciences Research Center, Guilan University of Medical Sciences, Rasht, Iran.
Clin Exp Dent Res. 2024 Aug;10(4):e935. doi: 10.1002/cre2.935.
This study aimed to identify the prevalence of the middle mesial canal (MMC) in mandibular first permanent molars in a Persian subpopulation sample using cone-beam computed tomography (CBCT). The secondary aim was to correlate the incidence of MMC with variables such as gender, age, and the presence of an additional distal canal.
A total of 390 mandibular first molars from 314 CBCT images were retrospectively evaluated. The presence of the MMC was recorded while considering related factors such as additional distal canal and demographic information of the patients (age and gender). Fisher's exact tests and independent-samples t-test were used for the statistical comparisons with a significance level of 0.05.
Among 390 mandibular first molars, 34 teeth contained an MMC (8.7%). The number of teeth with the MMC in women was equal to that of men. There was no significant difference between the two genders in the prevalence of the MMC (p > 0.05). The prevalence of patients' MMC had no significant relationship with their age (p > 0.05). However, there was a significant association between the presence of the MMC and an additional distal canal (p < 0.05).
The incidence of an additional distal canal in teeth with a diagnosed MMC was statistically significant. The prevalence of the MMC in mandibular first molars in the study population was low; however, accurate knowledge of root canal morphology in terms of the presence of an additional root canal in these teeth should be considered.
本研究旨在使用锥形束 CT（CBCT）确定伊朗人群样本下颌第一恒磨牙中中间近中管（MMC）的流行率。次要目的是将 MMC 的发生率与性别、年龄和是否存在额外远中根管等变量相关联。
回顾性评估了 314 张 CBCT 图像中的 390 颗下颌第一磨牙。在考虑患者的附加远中根管和人口统计学信息（年龄和性别）等相关因素的情况下，记录 MMC 的存在。Fisher 确切检验和独立样本 t 检验用于具有 0.05 显著性水平的统计比较。
在 390 颗下颌第一磨牙中，有 34 颗牙含有 MMC（8.7%）。女性牙齿中 MMC 的数量与男性相等。两种性别的 MMC 发生率无显著差异（p＞0.05）。患者 MMC 的患病率与年龄无显著关系（p＞0.05）。然而，MMC 的存在与额外远中根管之间存在显著关联（p＜0.05）。
在诊断为 MMC 的牙齿中存在额外远中根管的发生率具有统计学意义。研究人群中下颌第一磨牙 MMC 的发生率较低；然而，应该考虑这些牙齿中额外根管存在的情况下根管形态的准确知识。
