Investigation of the effects of miniscrew-assisted rapid palatal expansion on airflow in the upper airway of an adult patient with obstructive sleep apnea syndrome using computational fluidstructure interaction analysis
허재식, 김형호, 최진영, Suh Sang-Ho, 백승학,
소속 상세정보
허재식 ( Hur Jae-Sik ) - Seoul National University School of Dentistry Department of Orthodontics
김형호 ( Kim Hyoung-Ho ) - Soongsil University Department of Mechanical Engineering
최진영 ( Choi Jin-Young ) - Seoul National University School of Dentistry Department of Oral and Maxillofacial Surgery
( Suh Sang-Ho ) - Soongsil University Department of Mechanical Engineering
백승학 ( Baek Seung-Hak ) - Seoul National University School of Dentistry Department of Orthodontics
Abstract
Objective: The objective of this study was to investigate the effects of miniscrewassisted rapid palatal expansion (MARPE) on changes in airflow in the upper airway (UA) of an adult patient with obstructive sleep apnea syndrome (OSAS) using computational fluid-structure interaction analysis.
Methods: Threedimensional UA models fabricated from cone beam computed tomography images obtained before (T0) and after (T1) MARPE in an adult patient with OSAS were used for computational fluid dynamics with fluid-structure interaction analysis. Seven and nine cross-sectional planes (interplane distance of 10 mm) in the nasal cavity (NC) and pharynx, respectively, were set along UA. Changes in the crosssectional area and changes in airflow velocity and pressure, node displacement, and total resistance at maximum inspiration (MI), rest, and maximum expiration (ME) were investigated at each plane after MARPE.
Results: The cross-sectional areas at most planes in NC and the upper half of the pharynx were significantly increased at T1. Moreover, airflow velocity decreased in the anterior NC at MI and ME and in the nasopharynx and oropharynx at MI. The decrease in velocity was greater in NC than in the pharynx. The airflow pressure in the anterior NC and entire pharynx exhibited a decrease at T1. The amount of node displacement in NC and the pharynx was insignificant at both T0 and T1. Absolute values for the total resistance at MI, rest, and ME were lower at T1 than at T0.
Conclusions: MARPE improves airflow and decreases resistance in UA; therefore, it may be an effective treatment modality for adult patients with moderate OSAS.
키워드
Miniscrew-assisted rapid palatal expansion; Obstructive sleep apnea syndrome; Computational fluid dynamics; Fluid-structure interaction
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