Alnowailaty Yousef, Alghamdi Faisal
Conservative Dentistry, King Abdulaziz University, Faculty of Dentistry, Jeddah, SAU.
Oral Biology, King Abdulaziz University, Faculty of Dentistry, Jeddah, SAU.
Cureus. 2022 May 11;14(5):e24900. doi: 10.7759/cureus.24900. eCollection 2022 May.
Objective This retrospective study aimed to investigate the prevalence and location of the second mesiobuccal (MB2) canal in the mesiobuccal root of the maxillary first molar (MFM) and the maxillary second molar (MSM) through cone-beam computed tomography (CBCT) imaging. Methods One thousand two hundred CBCT images of the MFM and MSM were divided equally and analyzed. To standardize the methodology of MB2 detection, the observation and measurements were located at the pulpal floor by 1 mm apically. The distances between canals were calculated from the center point of the MB2 canal (PMB2) to the center point of both the first mesiobuccal canal (PMB1) and the palatal canal (PP). The data were provided in the form of frequencies and percentages. The chi-square test was used to analyze the differences among maxillary molars, while the significance level was set at 0.05. Results The prevalence of the MB2 canal in the MFM and MSM was 46.7% (p=0.020) and 17.7% (p=0.457), respectively. Additionally, the prevalence of the MB2 canal was more frequent in females. The average distance between PMB1 and PMB2 for MFM and MSM was 1.87±0.42 mm and 1.24±0.76 mm, respectively. Furthermore, the average distances of PMB2 and PP were 0.74±0.21 mm and 0.43±0.18 mm for MFM and MSM, respectively. Conclusion The MB2 canal was found in 386 (32.2%) of the maxillary molars. The Saudi people have a high possibility of discovering the MB2 canal. The CBCT is a useful and high-precision diagnostic tool not only for detecting but also for locating in vivo MB2 canal in the mesiobuccal root of maxillary molars.
目的 本回顾性研究旨在通过锥形束计算机断层扫描（CBCT）成像，调查上颌第一磨牙（MFM）和上颌第二磨牙（MSM）近中颊根中第二近中颊（MB2）根管的发生率及位置。方法 将1200例MFM和MSM的CBCT图像平均分组并进行分析。为规范MB2检测方法，观察和测量点位于髓室底根尖1mm处。计算MB2根管中心点（PMB2）与第一近中颊根管中心点（PMB1）及腭根管中心点（PP）之间的距离。数据以频率和百分比形式呈现。采用卡方检验分析上颌磨牙之间的差异，显著性水平设定为0.05。结果 MFM和MSM中MB2根管的发生率分别为46.7%（p = 0.020）和17.7%（p = 0.457）。此外，MB2根管在女性中更为常见。MFM和MSM的PMB1与PMB2之间的平均距离分别为1.87±0.42mm和1.24±0.76mm。此外，MFM和MSM的PMB2与PP之间的平均距离分别为0.74±0.21mm和0.43±0.18mm。结论 在386颗（32.2%）上颌磨牙中发现了MB2根管。沙特人群发现MB2根管的可能性较高。CBCT不仅是检测上颌磨牙近中颊根MB2根管的有用且高精度的诊断工具，也是在体内定位该根管的工具。
