Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5638869 | International Journal of Oral and Maxillofacial Surgery | 2017 | 6 Pages |
Abstract
The purpose of this study was to investigate the relationship between the pressure drop in the pharyngeal airway space (ÎPPAS) and the minimum cross-sectional area (minCSA) of the pharyngeal airway before and after mandibular setback surgery using computational fluid dynamics, in order to prevent iatrogenic obstructive sleep apnoea. Eleven patients with mandibular prognathism underwent bilateral sagittal split osteotomy for mandibular setback. Three-dimensional models of the upper airway were reconstructed from preoperative and postoperative computed tomography images, and simulations were performed using computational fluid dynamics. ÎPPAS and the minCSA of the pharyngeal airway were calculated, and the relationship between them was evaluated by non-linear regression analysis. In all cases, the minCSA was found at the level of the velopharynx. After surgery, ÎPPAS increased significantly and the minCSA decreased significantly. The non-linear regression equation expressing the relationship between these variables was ÎPPASÂ =Â 3.73Â ÃÂ minCSAâ2.06. When the minCSA was <1Â cm2, ÎPPAS increased greatly. The results of this study suggest that surgeons should consider bimaxillary orthognathic surgery rather than mandibular setback surgery to prevent the development of iatrogenic obstructive sleep apnoea when correcting a skeletal class III malocclusion.
Keywords
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Authors
Y. Yajima, M. Oshima, T. Iwai, H. Kitajima, S. Omura, I. Tohnai,