Computational fluid dynamics study of the pharyngeal airway space before and after mandibular setback surgery in patients with mandibular prognathism

Abstract The purpose of this study was to investigate the relationship between the pressure drop in the pharyngeal airway space ( ΔPPAS ) and the minimum cross-sectional area (minCSA) of the pharyngeal airway before and after mandibular setback surgery using computational fluid dynamics, in order to...

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Bibliographic Details
Published in:International journal of oral and maxillofacial surgery 2017-07, Vol.46 (7), p.839-844
Main Authors: Yajima, Y, Oshima, M, Iwai, T, Kitajima, H, Omura, S, Tohnai, I
Format: Article
Language:English
Subjects:
Adolescent
Adult
airflow
computational fluid dynamics
Dentistry
Female
Humans
Hydrodynamics
Iatrogenic Disease
Male
mandibular prognathism
mandibular setback surgery
Orthognathic Surgical Procedures
Osteotomy, Sagittal Split Ramus
pharyngeal airway space
Pharynx - physiopathology
Pharynx - surgery
Prognathism - diagnostic imaging
Prognathism - physiopathology
Prognathism - surgery
Sleep Apnea, Obstructive - etiology
Sleep Apnea, Obstructive - prevention & control
Software
Surgery
Tomography, X-Ray Computed
Treatment Outcome
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Summary:Abstract The purpose of this study was to investigate the relationship between the pressure drop in the pharyngeal airway space ( ΔPPAS ) 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. ΔPPAS 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, ΔPPAS increased significantly and the minCSA decreased significantly. The non-linear regression equation expressing the relationship between these variables was ΔPPAS = 3.73 × minCSA−2.06 . When the minCSA was
ISSN:0901-5027
1399-0020
DOI:10.1016/j.ijom.2017.03.028