Comparison Of Upper Airway Dimensions In Adult Skeletal Class Ⅱ Patients With Average And High Angle In CBACT

Objective:The study was to compare the upper air way volume,width,length,height and cross-sectional area in adult skeletal Class Ⅱ patients with high,average angle and to investigate whether upper air way is affected by untreated skeletal Class II adults with different vertical growth patterns and second,to analyze which part of upper airway volume is most decreased in skeletal Class II high angle patients.Materials and Methods:Cone-beam computed tomography(CBCT)records of 38 untreated adult skeletal class II patients aged 20-32 years were collected to evaluate the upper airway.Subjects were divided into two subgroups according to SN-mandibular plane angle(Normal and high angle]Results:The results showed that the upper airway volume,width,leng.th,height and cross-sectional area were significantly less(p<0.05)in high angle group compared with average angle group.In high angle group,glossopharyngeal airway volume is most decreased.Conclusions:The upper airway of high angle patients is significantly narrower than average angle patients.So,the upper airway measurements are affected by increasing in growth height.