Lee Seong-Ju, Lee Eun-Hye, Park Se-Hee, Cho Kyung-Mo, Kim Jin-Woo
Department of Conservative Dentistry, Gangneung-Wonju National University, Gangneung, Korea.
Department of Conservative Dentistry, Hanyang University Seoul Hospital, Seoul, Korea.
Restor Dent Endod. 2020 Sep 3;45(4):e46. doi: 10.5395/rde.2020.45.e46. eCollection 2020 Nov.
This study aimed to investigate the incidence and location of the second mesiobuccal root (MB2) canal in maxillary molars with the aid of various measuring points and lines using cone-beam computed tomography (CT).
A total of 205 images of patients who underwent cone-beam CT examinations between 2011 and 2015 as part of their dental diagnosis and treatment were included. There were 76 images of the maxillary first molar and 135 images of the maxillary second molar. Canal orifices were detected at -1 mm from the top of the pulpal floor on cone-beam CT images. Image assessment was performed by 2 observers in reformatted image planes using software. Assessments included measurement of the distance between the MB1 and MB2 canals, and the angles between the lines connecting the MB1-MB2 and distobuccal (DB)-palatal (P) canals. The data were analyzed using the student's -test.
The prevalence of the MB2 canal was 86.8% in the first molar and 28.9% in the second molar. The angle between the lines connecting the MB1-MB2 and DB-P canals was 2.3° ± 5.7° in the first molar and -3.95° ± 7.73° in the second molar. The distance between the MB1 and MB2 canals was 2.1 ± 0.44 mm in the first molar and 1.98 ± 0.42 mm in the second molar.
The angles between the lines connecting the MB1-MB2 and DB-P canals was almost parallel. These findings may aid in the prediction of the location of the MB2 canal orifice.
本研究旨在借助锥束计算机断层扫描（CT），通过各种测量点和线来调查上颌磨牙近中颊第二根管（MB2）的发生率及位置。
纳入了2011年至2015年间作为牙科诊断和治疗一部分接受锥束CT检查的患者的205张图像。其中上颌第一磨牙图像76张，上颌第二磨牙图像135张。在锥束CT图像上从髓室底顶部向下1mm处检测根管口。由2名观察者使用软件在重新格式化的图像平面上进行图像评估。评估内容包括测量MB1和MB2根管之间的距离，以及连接MB1-MB2和远中颊（DB）-腭（P）根管的线之间的角度。数据采用学生t检验进行分析。
第一磨牙中MB2根管的发生率为86.8%，第二磨牙中为28.9%。连接MB1-MB2和DB-P根管的线之间的角度在第一磨牙中为2.3°±5.7°，在第二磨牙中为-3.95°±7.73°。MB1和MB2根管之间的距离在第一磨牙中为2.1±0.44mm，在第二磨牙中为1.98±0.42mm。
连接MB1-MB2和DB-P根管的线之间的角度几乎平行。这些发现可能有助于预测MB2根管口的位置。
