Cone-beam computed tomography evaluation of upper airway change in skeletal Class Ⅲ patients after orthodontic-mandibular setback surgery
10.3760/cma.j.issn.1002-0098.2015.10.010
- VernacularTitle:正畸联合下颌升支矢状劈开截骨术治疗骨性Ⅲ类错(牙合)对上气道影响的锥形束CT分析
- Author:
Hongwei WANG
1
;
Suqing QI
;
Ming YAN
;
Chao ZHANG
;
Sufeng REN
;
Jingjing ZHANG
Author Information
1. 河北省眼科医院口腔正畸科
- Keywords:
Malocclusion,Angle Class Ⅲ;
Cone-beam computed tomography;
Upper airway;
Orthodontic-orthognathic surgical procedures
- From:
Chinese Journal of Stomatology
2015;50(10):615-618
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the short-term and long-term effects of pharyngeal airway in mandibular prognathism patients after the combined orthodontic and orthognathic treatment.Methods The sample included 28 skeletal Class Ⅲ patients (13 males,15 females) who had undergone mandibular setback surgery and orthodontic treatment.Cone-beam CT was taken one week before treatment (T0),6 months (T1) and 3 years after surgery (T2).Raw data were reconstructed into three-dimensional model.Sagittal and transversal measurements,cross sectional areas,partial and total volumes were computed.Results Six months after surgery,oropharyngeal volume [(9 021±4 263) mm3],hypopharyngeal volume [(9 236±5 963) mm3] and total volume [(28 619±9 854) mm3] decreased significantly (P＜0.05).Three years after surgery,only sagittal diameters [(15.9±3.5) mm] and cross sectional areas [(996±398) mm2] in the first cervical vertebra plane came back to the original levels (P＞0.05).Conclusions The pharyngeal airway space decreased after orthodontic-orthognathic therapy in the short term and it increased in some areas in the long term.
