title: Long-term evaluation of swallowing function before and after sagittal split ramus osteotomy.
abstract: The aim of this study was to determine whether mandibular setback by sagittal split ramus osteotomy (SSRO) influences swallowing function. The subjects were 14 patients with skeletal class III malocclusions who underwent setback surgery by SSRO. Morphological changes were studied on cephalograms, and swallowing function was evaluated by videofluorography before the operation (T0) and at 7-10 days (T1), 3 months (T2), and 6 months (T3) after surgery. The angle between nasion, sella, and hyoid bone (HSN) and the sella-hyoid distance had increased significantly at T1. The hyoid bone returned to the preoperative position at T2. There were no significant changes in the oropharyngeal space at any time. On videofluorographic assessment, lingual movement, soft palate movement, and epiglottic movement had decreased at T1, but all patients recovered at T2. The oral transit time was significantly longer at T1 than at T0. Our results confirm that SSRO influences swallowing function. Swallowing function appears to stabilize by 3 months after surgery.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Nihon University School of Dentistry, Tokyo, Japan. Electronic address: namaki.shunsuke@nihon-u.ac.jp.
authors.forename: S
authors.initials: S
authors.lastname: Namaki
authors.affiliation: Department of Oral and Maxillofacial Surgery, Nihon University School of Dentistry, Tokyo, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Maekawa
authors.affiliation: Department of Oral and Maxillofacial Surgery, Nihon University School of Dentistry, Tokyo, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Iwata
authors.affiliation: Department of Oral and Maxillofacial Radiology, Nihon University School of Dentistry, Tokyo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Sawada
authors.affiliation: Department of Oral and Maxillofacial Surgery, Juntendo University School of Medicine, Tokyo, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Namaki
authors.affiliation: Department of Oral Surgery and Oral Medicine, Faculty of Dentistry, University of Oslo, Oslo, Norway.
authors.forename: T
authors.initials: T
authors.lastname: Bjornland
authors.affiliation: Department of Oral and Maxillofacial Surgery, Nihon University School of Dentistry, Tokyo, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Yonehara
mesh_terms: D000328:Adult; D001860:Bone Plates; D002508:Cephalometry; D003679:Deglutition / Q000502:physiology*; D005260:Female; D005471:Fluoroscopy; D006801:Humans; D008297:Male; D008313:Malocclusion, Angle Class III / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000601:surgery*; D019767:Maxillofacial Abnormalities / Q000000981:diagnostic imaging / Q000601:surgery; D009971:Orthodontics, Corrective; D059229:Osteotomy, Sagittal Split Ramus; D016896:Treatment Outcome; D014741:Video Recording
keywords: hyoid bone; oropharyngeal airway; orthognathic surgery; swallowing function