A CBCT study on the upper airway of the children with Class Ⅱ mandibular retrusion before and after functional treatment by Twin-block appliance

VernacularTitle:安氏 II 类下颌后缩儿童应用 Twin-block 矫治器功能矫治前后上气道变化的锥形束 CT 研究
Author: Jianlu SHI ; Liling DONG ; Yun LI ; Hong HE
Publication Type:Journal Article
Keywords: Cone-Beam CT(CBCT); Upper airway; Mandibular retrusion; Functional treatment
From: Journal of Practical Stomatology 2015;(4):531-535
CountryChina
Language:Chinese
Abstract: Objective:To study the changes of upper airway dimension and morphology in Class Ⅱ mandibular retrusion children af-ter functional treatment by Twin-block appliance.Methods:The Cone-Beam CT(CBCT)data of upper airway of the subjects were measured with Dolphin 11.5 software before and after fuctional treatment by Twin-block appliance.The comparison of upper airway di-mension and morphology between pre-treatment and post-treatment was performed by paired t-text.Results:After functional treatment the volume of total upper airway,velopharyngeal airway,glossopharyngeal airway,laryngopharyngeal airway,oropharyngeal airway,the sectional area of the inferior of the soft palate(SP),tip of the epiglotti(TE),the sagittal diameter of SP,the lateral diameter of SP and TE increased(P <0.05)in the children;the airway's shape of SP was attended to be rounder and TE to be more flat.Conclusion:Functional treatment is effective in the treatment of skeletal Class Ⅱ mandibular retrusion of children by increase of the upper airway and improvement of respiration.