Long-term Evaluation of Airway Changes by Cone-beam Computed Tomography in Patients with Skeletal Class Ⅲ Malocclusion Treated by Orthodontic-bimaxillary Surgery.

doi:10.13701/j.cnki.kqyxyj.2016.12.023

Abstract

Abstract: Objective: To evaluate the long-term effects of orthodontic-bimaxillary surgery on pharyngeal airway in treating patients with skeletal Class Ⅲ malocclusion. Methods: Patients included in this study were 12 males and 14 females with skeletal Class Ⅲ malocclusion. The patients received LeFort I and bilateral split ramus osteotomies combined with orthodontic treatment. Cone-beam computed tomography was taken one week before, six months and three years after orthodontic treatment and the three dimensional model of pharyngeal airway was reconstructed. The sagittal and coronal diameter, cross section area, and the volume of the reconstructed pharyngeal airway were quantitatively measured. The data were statistically analyzed using SPSS version17.0. SNK test for variance analysis was conducted. Results: Six months after surgery, the sagittal diameter and cross section area at CV2, CV3 and CV4 planes significantly decreased(P<0.05), however they almost recovered to the preoperative level three years after surgery. Conclusion: Pharyngeal airway space decreased after the combined therapy in the short term and recovered to certain extent but not to the preoperative level in the long-term.

Key words: Orthodontic-surgery treatment , Skeletal Class Ⅲ malocclusion, Pharyngeal airwayCone-beam, CT

CLC Number:

R783.5

YAN Ming, WANG Hong-wei, LI Li-yan. Long-term Evaluation of Airway Changes by Cone-beam Computed Tomography in Patients with Skeletal Class Ⅲ Malocclusion Treated by Orthodontic-bimaxillary Surgery.[J]. Journal of Oral Science Research, 2016, 32(12): 1319-1322.

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