Clinical Report : The Effect of Cranial Change on Oropharyngeal Airway and Breathing During Sleep

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  • Nakano Hiroyuki
    Department of Oral Surgery, Osaka Medical College
  • Mishima Katsuaki
    Department of Oral and Maxillofacial Surgery, Yamaguchi University Graduate School of Medicine
  • Suga Hokuto
    Department of Pediatric Dentistry, Kagoshima University Graduate School of Medical and Dental Sciences
  • Iwasaki Tomonori
    Department of Pediatric Dentistry, Kagoshima University Graduate School of Medical and Dental Sciences
  • Inoue Kazuya
    Department of Oral Surgery, Osaka Medical College
  • Mano Takamitsu
    Department of Oral Surgery, Institute of Biomedical Sciences, Tokushima University Graduate School
  • Yoshimura Chikara
    Department of Respiratory Medicine, Faculty of Medicine, Fukuoka University
  • Suzuki Kei
    Department of Oral Surgery, Osaka Medical College
  • Imagawa Naoko
    Department of Oral Surgery, Osaka Medical College
  • Ueno Takaaki
    Department of Oral Surgery, Osaka Medical College
  • Mori Yoshihide
    Section of Oral and Maxillofacial Surgery, Division of Maxillofacial Diagnostic and Surgical Sciences, Faculty of Dental Science, Kyushu University
  • Ueyama Yoshiya
    Department of Pediatric Dentistry, Kagoshima University Graduate School of Medical and Dental Sciences

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  • The Effect of Cranial Change on Oropharyngeal Airway and Breathing During Sleep

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<p>Mandibular micrognathia is one of the characteristics of obstructive sleep apnea syndrome. The purpose of this study was to assess the effects of bimaxillary surgery without maxillary advancement on the upper airway using computational fluid dynamics (CFD) results of comparing pre- and post-operative finite element model. Seven female patients with jaw deformity, who underwent two-jaw surgery (Le Fort1 osteotomy and bilateral sagittal split ramus osteotomy; BSSRO) were enrolled. Maxillary was moved for correcting occlusal plane and mandibular was moved to advancement. Pharyngeal airway space and breathing during sleep were evaluated, comparing the periods of 2 days before and 6 months after the operation. The cross-sectional area of the level of the hard palate (HP) and the level of the tip of the uvula (TU), and airway volume of total, HP-TU, and TP- the level of the base of the epiglottis (BE) were increased. AI and AHI in 2 days before and 6 months after were decreased. As the result of nasal ventilation condition, velocity of HP and TU in 2 days before and 6 months after were decreased. We think that it was revealed that movement of the maxilla without advancement did not affect to the morphology and function of airway.</p>

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