正颌外科矫治骨性下颌偏斜的术前及术后正畸治疗

目的　分析、总结临床采用正畸 正颌外科方法联合治疗严重骨性下颌偏斜畸形时术前与术后正畸治疗中的难点和要点 ,为临床工作提供参考。方法　严重骨性下颌偏斜畸形患者 2 1例 ,年龄 19～ 2 8岁 ,平均年龄 2 5 5岁。ANB角 - 3°～ - 8° ,Wits值 - 7～ - 14mm ,颏点偏斜 3～ 7mm。所有患者均接受术前及术后正畸治疗。结果　术前正畸疗程为 10～ 2 0个月 ,平均 18个月。术后正畸疗程为 5～ 10个月 ,平均 7 5个月。术前正畸治疗必须要解决以下主要难点 :①去除患者三维方向的牙代偿 ;②协调其牙弓形态及宽度的不调 ;③双颌手术时模型外科分析与导板的制作。术后正畸治疗的主要目的是对咬合关系进行精细调整。结论　术前术后正畸治疗是正颌外科治疗下颌偏斜畸形取得良好效果的必要保证

Pre- and post-surgical orthodontic treatment of mandibular asymmetry and prognathism

OBJECTIVE: The purpose of this study was to analyze the pre- and post surgical orthodontic treatment of mandibular asymmetry and prognathism in our hospital, and to summarize some helpful experiences for future clinical work. METHODS: The data were derived from 21 adults aged from 19 - 28 years who had severe mandibular asymmetry and prognathism. The ANB angle of all patients is from -3 degrees to -8 degrees. The value of wits of all patients is from -7 mm to -14 mm. The deviation of chin point of all patients is from 3 mm to 7 mm. RESULTS: The duration of pre- and post-surgical orthodontic treatment was 10-20 months (mean 18 months) and 5-10 months (mean 7.5 months), respectively. The keys in pre-surgical orthodontic treatment include (1) three dimensional dental decompensation; (2) arch form and transverse discrepancy correction; (3) model surgery and the splint making. The main objective of post surgical orthodontic treatment is to detail the occlusion. CONCLUSIONS: Pre- and post surgical orthodontic treatment is essential for the orthognathic treatment of patients with mandibular asymmetry and prognathism.