Graduate Institute of Dental and Craniofacial Science, Chang Gung University, Taoyuan, Taiwan.
Department of Craniofacial Orthodontics, Chang Gung Memorial Hospital, No. 123, Dinghu Road, Guishan District, Taoyuan City, 333, Taiwan.
Clin Oral Investig. 2020 Oct;24(10):3641-3651. doi: 10.1007/s00784-020-03242-3. Epub 2020 Feb 29.
We aimed to quantify the displacement of the proximal segment after bilateral sagittal split osteotomy in patients with class III asymmetry and evaluate if the displacement was related to the movement of the distal segment.
Forty adults with class III asymmetry corrected by bimaxillary surgery were studied. Cone-beam computed tomography taken before and 1 week after surgery was used to measure the displacement of proximal segments and movement of the distal segment in terms of translation and rotation. The relationship between the displacemnt of the proximal segment and the movement of the distal segment was evaluated.
After surgery, the deviated proximal segment was displaced forward and to the deviated side, rotated downward, tilted, and turned to the opposite side. The opposite proximal segment was displaced forward and rotated downward. The roll rotation of the proximal segment was correlated with the left/right movement and roll rotation of the distal segment.
Early after orthognathic correction for class III asymmetry, the deviated proximal segment was displaced in a direction favorable for correction of asymmetry. The roll rotation of the proximal segment was affected by the transverse movement and roll rotation of the distal segment.
Knowledge of the ability and limitation of the proximal segment rotation improves the virtual simulation.
我们旨在量化 III 类不对称患者双侧矢状劈开截骨术后近段骨段的移位，并评估其与远段骨段的运动是否相关。
研究了 40 名接受双颌手术矫正的 III 类不对称成人患者。使用术前和术后 1 周的锥形束 CT 测量近段骨段的移位以及远段骨段的平移和旋转运动。评估了近段骨段的移位与远段骨段运动之间的关系。
术后，偏斜的近段骨段向前和向偏斜侧移位，向下旋转、倾斜并转向对侧。对侧近段骨段向前和向下旋转。近段骨段的滚转旋转与远段骨段的左右运动和滚转旋转相关。
在 III 类不对称正颌矫正后早期，偏斜的近段骨段向有利于纠正不对称的方向移位。近段骨段的滚转旋转受远段骨段的横向运动和滚转旋转的影响。
了解近段骨段旋转的能力和局限性可改善虚拟模拟。
