双侧下颌升支矢状劈开截骨术对骨性下颌前突病人上气道宽度和舌骨位置的影响

目的探讨严重骨性下颌前突病人施行双侧下颌升支矢状劈开截骨术(BSSRO)后其气道宽度及舌骨位置变化。方法选择15例严重下颌前突病人,术前正畸治疗结束后单纯行BSSRO,对病人术前1周和术后1月头颅定位X线侧位片进行测量,比较气道宽度和舌骨位置差异。结果骨性下颌前突病人单纯行BSSRO,术后上气道鼻咽段、腭咽段、舌咽段及喉咽段均较术前缩窄,差异有显著性(t=2.166~3.791,P<0.05);舌骨垂直向的位置明显降低(t=2.719~7.303,P<0.05),水平向位置显著后移(t=2.241~2.966,P<0.05)。结论严重骨性下颌前突病人单纯行BSSRO后,气道宽度减小,舌骨向下向后移位。

EFECTS OF BILATERAL SAGITTAL SPLIT RAMUS OSTEOTOMY ON UPPER AIRWAY SPACE AND HYOID POSITIONS IN PATIENTS WITH OSSEOUS MANDIBULAR PROGNATHISM

Objective To investigate the changes of airway space and hyoid positions following bilateral sagittal split ramus osteotomy(BSSRO) for patients with osseous mandibular prognathism(OMP). Methods Fifteen patients with severe OMP were enrolled and underwent BSSRO after orthodontic treatment.Lateral head X-ray films,one week before and one month after surgery,were measured,the airway space and the positions of hyoid bone were compared. Results After BSSRO,the space of upper airway was decreased(t=2.166-3.791,P<0.05),the vertical position of the hyoid bone was lowered,and the horizontal position of the hyoid bone retro-positioned(t=2.241-7.303,P<0.05). Conclusion After BSSRO,the airway space of patients with severe OMP decreases and the position of the hyoid bone moves downward and backward.