title: Changes in the lip-line in asymmetrical cases treated with isolated mandibular surgery.
abstract: OBJECTIVE
  The aim of this study was to investigate changes in the lip-line in asymmetrical cases treated with mandibular osteotomy alone.
  
  
  METHODS
  Retrospective study.
  
  
  METHODS
  Hiroshima University Institute of Biomedical & Health Sciences, Hiroshima, Japan
  
  
  METHODS
  The subjects in this study consisted of 30 patients with an altered lip-line inclination who underwent isolated mandibular osteotomy (bilateral or unilateral sagittal split ramus osteotomy or intraoral vertical ramus osteotomy) as part of their surgical correction. Frontal cephalograms and facial photographs, taken at the first examination and after treatment, were used to measure changes in the inclination of the lip-line and cant of the occlusal plane, as well as the lateral deviations of hard and soft tissue Menton.
  
  
  RESULTS
  Inclination of the lip-line after active treatment was significantly improved compared with that before treatment. Menton on the hard and soft tissues after active treatment also experienced a significant improvement compared with its position at first examination.
  
  
  CONCLUSIONS
  One-jaw mandibular osteotomy is able to improve the inclination of the lip-line even in the presence of an occlusal cant. The inclination of the lip-line is corrected in association with sufficient lateral movements of Menton on the mandible.
authors.affiliation: Dr T. Fujita, Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Institute of Biomedical & Health Sciences, Hiroshima, Japan. seven@hiroshima-u.ac.jp.
authors.forename: Tadashi
authors.initials: T
authors.lastname: Fujita
authors.forename: Maya
authors.initials: M
authors.lastname: Shirakura
authors.forename: Myongsun
authors.initials: M
authors.lastname: Koh
authors.forename: Goshi
authors.initials: G
authors.lastname: Itoh
authors.forename: Hidetaka
authors.initials: H
authors.lastname: Hayashi
authors.forename: Kazuo
authors.initials: K
authors.lastname: Tanne
mesh_terms: D002508:Cephalometry / Q000379:methods; D002680:Chin / Q000473:pathology; D003766:Dental Occlusion; D005146:Facial Asymmetry / Q000601:surgery*; D005260:Female; D005500:Follow-Up Studies; D005624:Frontal Bone / Q000473:pathology; D006801:Humans; D008046:Lip / Q000473:pathology*; D008297:Male; D063168:Mandibular Osteotomy / Q000379:methods*; D056948:Orthognathic Surgical Procedures / Q000379:methods; D059229:Osteotomy, Sagittal Split Ramus / Q000379:methods; D010781:Photography / Q000379:methods; D012189:Retrospective Studies; D055815:Young Adult; D015050:Zygoma / Q000473:pathology
keywords: Facial asymmetry; lip-line; one-jaw surgery