J Korean Assoc Oral Maxillofac Surg 2017; 43(2): 88~93
Two-dimensional and volumetric airway changes after bimaxillary surgery for class III malocclusion
Toraj Vaezi1, Seyed Hossein Hosseini Zarch2, Majid Eshghpour3, Hamed Kermani3,4
1Oral and Maxillofacial Surgeon, Maxillofacial Trauma Fellow, Sina Hospital, Tehran University of Medical Sciences, Tehran,
2Department of Oral and Maxillofacial Radiology, Dental Material Research Center and School of Dentistry, Mashhad University of Medical Sciences,
3Oral and Maxillofacial Surgeon, Mashhad University of Medical Sciences Dental School,
4Oral and Maxillofacial Diseases Research Center, Mashhad, Iran
Hamed Kermani
Oral and Maxillofacial Surgeon, Mashhad University of Medical Sciences Dental School, Pardis Daneshgah, Azadi Square, Mashhad 91779-48959, Iran
TEL: +98-51-38829501-15
FAX: +98-51-38829500
E-mail: Hamedkermani1980@gmail.com
Received September 13, 2016; Revised November 7, 2016; Accepted November 19, 2016.; Published online April 30, 2017.
© Korean Association of Oral and Maxillofacial Surgeons. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
Objectives: Any change in maxilla and mandible position can alter the upper airway, and any decrease in the upper airway can cause sleep disorders. Thus, it is necessary to assess airway changes after repositioning of the maxilla and mandible during orthognathic surgery. The purpose of this study was to evaluate linear and volumetric changes in the upper airway after bimaxillary surgery to correct class III malocclusion via cone-beam computed tomography (CBCT) and to identify correlations between linear and volumetric changes.
Materials and Methods: This was a prospective cohort study. CBCTs from 10 class III patients were evaluated before surgery and three months after. The Wilcoxon one-sample test was used to evaluate the differences in measurements before and after surgery. Spearman’s rank correlation coefficient was used to test the correlation between linear and volumetric changes.
Results: The results show that the nasopharyngeal space increased significantly, and that this increase correlated with degree of maxillary advancement. No significant changes were found in volumes before and after surgery. A correlation was found between linear and volumetric oropharyngeal changes.
Conclusion: Bimaxillary surgical correction of class III malocclusion did not cause statistically significant changes in the posterior airway space.
Keywords: Malocclusion, Upper airway, Bimaxillary orthognathic surgery, Computed tomography


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