تاثير الارجاع الجراحي للفك السفلي بالقطع العظمي السهمي للراد في المجرى الهوائي البلعومي السفلي

Background & Objective: Treatment of dentofacial deformities with jaw osteotomies has an effect on airway anatomy, therefore mandibular setback surgery has potential to diminish airway size. The aim of this study was evaluation the effect of mandibular setback surgery by bilateral sagittal split ramus osteotomy (BSSRO) on lower pharyngeal airway size in anteroposterior direction retrolingually and hyoid bone position. Material& methods: 16 consecutive patients (5 males and 11 females) with average age 22.25 years (range 17 to 47 years) and skeletal class III malocclusion underwent mandibular setback surgery by bilateral sagittal split ramus osteotomy in Oral & Maxillofacial Surgery Hospital, Faculty of Dentistry-Damascus University. The average of mandibular setback was 6.78 mm (range 3 to 13 mm). Lateral cephalometric analysis was performed preoperatively and 3 months postoperatively with particular attention to lower pharyngeal airway changes. T-test and Pearson correlation were used in statistic study at (P<0.05). Results: The lateral cephalometric radiographs demonestrated that the average decrease of lower pharyngeal airway size was 13.93% (range 4.35% to 25.93%) in anteroposterior direction retrolingually and it was statistically significant (P<0.05). Hyoid bone showed posteroinferior repositioning. Analysis revealed a statistically significant correlation between decrease in pharyngeal airway and amount of mandibular setback (r=0.987). Conclusion: Careful pharyngeal airway analysis should be performed, particularly in correction with large anteroposterior discrepancies. Such cases should be corrected by combined maxillary and mandibular osteotomies