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KMID : 1813120170020010027
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Journal of Sleep and Dental Medicine
2017 Volume.2 No. 1 p.27 ~ p.31
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Effects of mandibular setback surgery with Le Fort I surgery on the pharyngeal airway space and respiratory function during sleep
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Besana Aaron Neil
Agpoon Kryssa
Kim Soo-Ho
Lim Ho-Kyung
Lee Eui-Seok
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Abstract
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Introduction: Mandibular setback surgery is often associated with sleep-disordered breathing or obstructive sleep apnoea syndrome (OSAS) because of postoperative reduction of the pharyngeal airway space. The purpose of this study was to investigate whether mandibular setback surgery causes OSAS with morphological changes.
Materials and methods: 12 patients who have undergone mandibular setback surgery at Korea University Guro Hospital with no previous symptoms of OSAS were included in this study. Bilateral sagittal split with Le Fort I osteotomies were performed on all patients for improvement of facial asymmetry and mandibular prognathism. A simple polysomnography was performed before surgery and after surgery. Changes in the morphology were evaluated on the lateral cephalometric radiographs. The apnea-hypopnea index (AHI) was calculated as the sum of the apnea and hypopnea events per hour of sleep. An apnea event was defined as the cessation of airflow for more than 10s, and a hypopnea event was defined as <70% of a normal breath and/or a >4% drop in SpO2 during sleep. SpO2 was measured overnight at the same time.
Conclusion: Results of this study have shown that mandibular setback surgery indeed causes reduction in the pharyngeal airway space. However, it was not the cause of sleep disordered breathing in patients.
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