Magat G, Hakbilen S
Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Necmettin Erbakan University, Konya, Turkey.
Folia Morphol (Warsz). 2019;78(2):351-358. doi: 10.5603/FM.a2018.0092. Epub 2018 Oct 9.
Permanent maxillary molar teeth have the most complex root and canal systems. This study aimed to determine the frequency and the localisation of secondary mesiobuccal canal (MB2) in the mesiobuccal roots of permanent maxillary molars in a Turkish subpopulation using cone-beam computed tomography (CBCT) and compare them by different age groups and gender.
In this retrospective study, a total of 800 maxillary molar teeth in 200 subjects were investigated. The distances between canals were calculated from the centre point of the MB2 canal (PMB2) to the centre point of the mesiobuccal canal (PMB1) and the centre point of the palatal canal (PP).
The incidence of MB2 canals was found to be 33.5% (23.2% in females, 43.6% in males) in 200 subjects. A significant difference was found between age groups and genders in terms of the frequency of MB2 (p < 0.05). The distances between PMB1- -PMB2 were 2.95 ± 0.58 mm, 3.08 ± 0.67 mm for 1MM and 2MM, respectively. For 1MM and 2MM, the averages of PMB2-PP distances were 5.81 ± 1.09 mm and 5.55 ± 1.09 mm, respectively. The contralateral formation of the MB2 canals was 90.5% (16, 26) in the first molars and 93.9% in the second molars (17, 27). The contingency rate in the first quadrant was 86.0% (16, 17) and 83.5% (26, 27) in the second quadrant.
It is important for the clinician to know the high probability of finding the MB2 canal in the maxillary first and second molars. CBCT imaging can facilitate the clinician to detect complex and variable root canal anatomy.
上颌恒磨牙具有最为复杂的牙根和根管系统。本研究旨在使用锥形束计算机断层扫描（CBCT）确定土耳其亚人群中上颌恒磨牙近中颊根中第二近中颊根管（MB2）的出现频率和位置，并按不同年龄组和性别进行比较。
在这项回顾性研究中，共调查了200名受试者的800颗上颌磨牙。计算从MB2根管中心点（PMB2）到近中颊根管中心点（PMB1）以及腭侧根管中心点（PP）之间的距离。
在200名受试者中，MB2根管的发生率为33.5%（女性为23.2%，男性为43.6%）。在MB2的出现频率方面，年龄组和性别之间存在显著差异（p < 0.05）。PMB1与PMB2之间的距离，第一磨牙和第二磨牙分别为2.95±0.58毫米和3.08±0.67毫米。对于第一磨牙和第二磨牙，PMB2与PP之间距离的平均值分别为5.81±1.09毫米和5.55±1.09毫米。第一磨牙中MB2根管的对侧形成率为90.5%（16, 26），第二磨牙中为93.9%（17, 27）。第一象限的符合率为86.0%（16, 17），第二象限为83.5%（26, 27）。
临床医生了解在上颌第一和第二磨牙中发现MB2根管的高概率很重要。CBCT成像有助于临床医生检测复杂多变的根管解剖结构。
