Effect of maxillary setback movement on upper airway in patients with class III skeletal deformities: cone beam computed tomographic evaluation.

摘要: The purpose of this study was to investigate, through cone beam computed tomography, volumetric changes the upper airway space in patients with skeletal class III deformities who had undergone mandibular setback surgery (group A [n = 24]) or bimaxillary (mandibular and maxillary Le Fort I osteotomy; group B 23]). All underwent a tomographic examination for assessment volume before (T0) 6 months after (T1). In an evaluation anatomic characteristics airway, anteroposterior length (APL), largest transverse width (LTW), cross-sectional area (CSA) on axial planes (the posterior nasal spine-posterior point vomer (PNS-Vp), 1st cervical vertebra (CV(1)), 2nd (CV(2)), 3rd (CV(3)), 4th (CV(4)) planes) were calculated at T0 T1. No significant differences between groups (P > 0.05) found. A, movement affected oropharyngeal hypopharyngeal volumes reduced APL, LTW, CSA CV1, CV(2), CV(3) < 0.05). APL CV(4) plane also B, narrowed volumes. Specifically, CV(1), CV(3), planes, LTW PNS-Vp, decreased Between 2 groups, there statistical PNS-Vp plane.