Hasheminia Mohsen, Razavian Hamid, Khorrami Ladan, Mosleh Hamid, Mohamadi Sanaz
Department of Endodontics, Dental Research Center, Dental Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran.
Department of Endodontics, Dental Materials Research Center, Dental Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran.
Dent Res J (Isfahan). 2021 Jun 22;18:42. eCollection 2021.
The purpose of this study was to evaluate the prevalence of middle mesial canal in mandibular first molars using cone-beam computed tomography (CBCT).
In this descriptive study, a total of 768 radiographs of mandibular first molars, 384 for males and 384 for females, taken at a private radiology center in Isfahan, were assessed for the presence of middle mesial canal based on the gender of the patients. All samples had been prepared by one CBCT machine. The images were evaluated by endodontists and radiologists. Then, the morphology of first molar mesial root canals was assessed by Vertucci classification, and the obtained results were analyzed by SPSS software using a Chi-square test. The comparison was considered statistically significant at < 0.05.
Twenty-four samples (3.13%) had a middle mesial canal. The prevalence rates of the middle mesial canal in the females and males were found to be 9 and 15 (2.35% vs. 3.92%), respectively, indicating no statistically significant difference ( = 0.21). Of 24 teeth with middle mesial canal, 17 samples (70.8%) were of Type XII and 7 samples (29.2%) were of Type VIII. There was no statistically significant difference between genders with regard to the prevalence of different types of middle mesial canals ( = 0.19).
The prevalence of the middle mesial canal was rather low in this study, and it is necessary to detect additional canals in the patients under root canal treatment.
本研究旨在使用锥形束计算机断层扫描（CBCT）评估下颌第一磨牙中近中根管的发生率。
在这项描述性研究中，对在伊斯法罕一家私人放射中心拍摄的768张下颌第一磨牙的X线片进行评估，根据患者性别判断是否存在中近中根管。所有样本均由一台CBCT机采集。图像由牙髓病医生和放射科医生进行评估。然后，根据Vertucci分类法评估第一磨牙近中根管的形态，并使用SPSS软件通过卡方检验对所得结果进行分析。当P<0.05时，认为比较具有统计学意义。
24个样本（3.13%）存在中近中根管。女性和男性中近中根管的发生率分别为9例和15例（2.35%对3.92%），表明无统计学显著差异（P=0.21）。在24颗有中近中根管的牙齿中，17个样本（70.8%）为XII型，7个样本（29.2%）为VIII型。不同类型中近中根管的发生率在性别之间无统计学显著差异（P=0.19）。
本研究中中近中根管的发生率较低，在根管治疗的患者中检测额外的根管很有必要。
