Department of Operative and Endodontic Dentistry, Faculty of Dentistry, Damascus University, Damascus, Syria.
Department of Orthodontics, National Dental Centre for Syrian Board and Specializations, Damascus, Syria.
BMC Oral Health. 2024 Sep 11;24(1):1071. doi: 10.1186/s12903-024-04851-0.
To investigate the root number and morphology of the maxillary second molars in the Syrian population besides bilateral symmetry, and the effect of gender.
250 Cone Beam Computed Tomography (CBCT) images (140 females, 110 males) were examined by two endodontists. The detailed analysis included the number of roots, the number of canals and their configurations, bilateral symmetry, and relation to gender. The evaluation was made according to Vertucci classification by analyzing the CBCT images at all levels (Axial, Coronal, Sagittal, Oblique, and 3D). The Chi-square statistical analysis was performed to compare the canals' morphologies and bilateral symmetry in both genders via SPSS.
The most common shape of the upper second molars is three roots (90.4%). There were significant differences between males and females regarding the symmetry of the number of roots (P < 0.05). The root canal configuration was mainly Vertucci type I classification in the Distobuccally (93.4%) and palatal root (99.6%). The most common type in the mesial root was type I (29.5%), showing all varieties of Vertucci classifications (except VII, and VIII) percentage of MB2 of 70.5%. The ratio of symmetry was (59.6%) with no significant statistical difference between the genders (P = 0.708).
Most maxillary second molars in the examined Syrian population were types (II) (associated with MB2 cases with three roots and four canals). In terms of symmetry, the number of roots surpassed the canal configuration. Males had a greater symmetrical tendency in the number of roots than females.
除了双侧对称外，还研究叙利亚人群上颌第二磨牙的根数和形态，以及性别对其的影响。
由两位牙髓病学家对 250 例锥形束 CT（CBCT）图像（140 名女性，110 名男性）进行检查。详细分析包括根的数量、根管的数量和形态、双侧对称性以及与性别的关系。通过分析所有层面（轴向、冠状、矢状、斜向和 3D）的 CBCT 图像，按照 Vertucci 分类对根管形态和双侧对称性进行评估。通过 SPSS 对男性和女性根管形态和双侧对称性进行卡方检验。
上颌第二磨牙最常见的形状是三根（90.4%）。男性和女性的根数对称性存在显著差异（P<0.05）。在远颊根和腭根中，根管形态主要为 Vertucci Ⅰ型（93.4%）。在近中根中，最常见的类型是Ⅰ型（29.5%），显示出除了 Vertucci 分类（除了 VII 和 VIII）外的所有类型（MB2 占 70.5%）。对称性比例为（59.6%），性别之间无显著统计学差异（P=0.708）。
在所研究的叙利亚人群中，大多数上颌第二磨牙为Ⅱ型（与具有三根和四根根管的 MB2 病例相关）。在对称性方面，根的数量超过了根管形态。男性在根的数量上比女性具有更大的对称性倾向。
