PDF(Pubmed)
Abstract：
The treatment of dentofacial deformities generally includes orthognathic surgery in which mandibular condyle changes following surgery are a common cause of relapse. This study investigated the changes in the mandibular condyle and related muscles to identify the factors that affected the changes in the mandibular condyle after orthognathic surgery in skeletal class II patients. This research studied 60 joints in 30 patients with skeletal class II dentofacial deformities who received surgical orthodontic treatment, including bilateral sagittal split ramus osteotomy, and underwent computed tomography before and after orthodontic treatment. The mandibular condyle, masseter, and medial pterygoid muscles were reconstructed and measured in 3D. Condylar positional and morphology changes, masseter and medial pterygoid muscle volume, temporomandibular joint (TMJ) pain, and distal segment movement were analyzed. The study observed that both the masseter and medial pterygoid muscle volumes decreased with statistical significance. The changes in the horizontal direction were positively correlated with the amount of movement. The findings indicated that mandibular condyle changes were significantly affected by the movement of the distal segment, the medial pterygoid muscle volume, and the direction of the distal segment, which influenced the treatment\'s long-term stability after orthognathic surgery.
摘要：
牙面畸形的治疗通常包括正颌手术，其中手术后下颌髁突的变化是复发的常见原因。这项研究调查了下颌髁突和相关肌肉的变化，以确定影响骨骼II类患者正颌手术后下颌髁突变化的因素。这项研究研究了30例接受外科正畸治疗的骨骼II类牙颌面畸形患者的60个关节，包括双侧矢状位劈开支截骨术，并在正畸治疗前后进行了计算机断层扫描。下颌髁突,咬肌,对翼外内侧肌进行三维重建和测量。髁突位置和形态变化,咬肌和内侧翼状肌体积，颞下颌关节（TMJ）疼痛，和远端运动进行了分析。该研究观察到咬肌和内侧翼状肌体积均具有统计学意义。水平方向的变化与运动量呈正相关。研究结果表明，下颌髁突的改变受到远段运动的显著影响，翼外肌内侧体积,和远端段的方向，这影响了正颌手术后治疗的长期稳定性。
