Angle Orthod. 2024 Nov 1;94(6):631-640. doi: 10.2319/022324-141.1.
To compare mandibular incisor compensation relative to Menton (Me) deviation between skeletal Class III patients with roll- and yaw-dominant mandibular asymmetries.
Sixty skeletal Class III patients (21.62 ± 2.69 years) with facial asymmetry were divided into roll- or yaw-dominant asymmetry groups. Mandibular skeletal and incisor measurements were carried out using cone-beam computed tomography data, and values were compared between the two asymmetry groups or between moderate and severe asymmetry subgroups using independent t-test or Mann-Whitney U-test. The relationship between skeletal and dental measurements was assessed using Pearson correlation coefficient.
Relative to the mandibular midsagittal plane, the yaw-dominant group presented significantly greater mandibular dental midline deviation in distance (LI-mid deviation, 2.15 mm) and angulation (4.20°) toward the nondeviated side than the roll-dominant group (P < .001). The ratio of amount of LI-mid deviation to Me deviation was significantly greater in the yaw-dominant group (26.44%) than in the roll-dominant group (1.76%; P < .001). In the yaw-dominant group, the LI-mid deviation was significantly greater in the severe asymmetry subgroup than in the moderate asymmetry subgroup, and the amount of mandibular incisor compensation was positively correlated with Me deviation and mandibular yaw.
Mandibular incisor compensation differed significantly between the roll- and yaw-dominant asymmetry groups. The yaw-dominant group demonstrated significant mandibular dental midline deviation, and dental compensation of the anterior teeth was positively correlated with Me deviation and mandibular yaw.
比较下颌切牙相对于颏部（Me）偏斜的补偿在以旋转和侧方偏斜为主的下颌不对称的骨性 III 类患者中的差异。
将 60 名具有面部不对称的骨性 III 类患者（21.62±2.69 岁）分为旋转或侧方优势不对称组。使用锥形束 CT 数据进行下颌骨骼和切牙测量，通过独立 t 检验或曼-惠特尼 U 检验比较两组不对称组或中度和重度不对称亚组之间的测量值。使用 Pearson 相关系数评估骨骼和牙齿测量之间的关系。
与下颌正中矢状面相比，侧方优势组下颌牙中线相对于无偏侧的距离（LI-中线偏差，2.15mm）和角度（4.20°）的偏差明显更大（P<.001）。侧方优势组的 LI-中线偏差与 Me 偏差的比值明显大于旋转优势组（26.44%比 1.76%；P<.001）。在侧方优势组中，重度不对称亚组的 LI-中线偏差明显大于中度不对称亚组，下颌前牙的补偿量与 Me 偏差和下颌侧方偏斜呈正相关。
旋转和侧方优势不对称组之间下颌切牙补偿明显不同。侧方优势组表现出明显的下颌牙中线偏斜，前牙的牙补偿与 Me 偏斜和下颌侧方偏斜呈正相关。
