title: Long-term stability of surgical-orthodontic open-bite correction.
abstract: BACKGROUND
  The objective of this study was to evaluate the long-term stability of open-bite surgical-orthodontic correction.
  
  
  METHODS
  Thirty-nine patients at an initial mean age of 20.83 years were evaluated cephalometrically at pretreatment (T1), immediately after treatment (T2), and at the last recall (T3), with a mean follow-up time of 8.22 years. The surgical protocol included single-jaw or double-jaw surgery. Because the patients had different anteroposterior malocclusions, the sample was divided into a Class I and Class II (I-II) subgroup (3 Class I, 20 Class II malocclusion patients) and a Class III subgroup (16 patients). The dentoskeletal characteristics of the total sample and the subgroups were compared at T1, T2, and T3 with dependent analysis of variance (ANOVA).
  
  
  RESULTS
  Overbite relapse in the posttreatment period was statistically significant in the whole sample and the Class I-II subgroup. Fourteen patients of the whole sample (35.9%) had clinically significant open-bite relapse (negative overbite).
  
  
  CONCLUSIONS
  There was a statistically significant open-bite relapse in the overall sample and in the Class I-II subgroup. The clinically significant values of long-term open-bite correction stability were 64.11%, 47.82%, and 87.50% in the overall sample, the Class I-II subgroup, and the Class III subgroup, respectively.
authors.affiliation: Department of Orthodontics, University of São Paulo, Bauru, Brazil.
authors.forename: Francisco Ajalmar
authors.initials: FA
authors.lastname: Maia
authors.forename: Guilherme
authors.initials: G
authors.lastname: Janson
authors.forename: Sérgio Estelita
authors.initials: SE
authors.lastname: Barros
authors.forename: Nair G
authors.initials: NG
authors.lastname: Maia
authors.forename: Kelly
authors.initials: K
authors.lastname: Chiqueto
authors.forename: Alexandre Yudi
authors.initials: AY
authors.lastname: Nakamura
mesh_terms: D000293:Adolescent; D000328:Adult; D001860:Bone Plates; D001863:Bone Screws; D001864:Bone Wires; D002508:Cephalometry; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008311:Malocclusion, Angle Class I / Q000601:surgery / Q000628:therapy; D008312:Malocclusion, Angle Class II / Q000601:surgery / Q000628:therapy; D008313:Malocclusion, Angle Class III / Q000601:surgery / Q000628:therapy; D008334:Mandible / Q000601:surgery; D008437:Maxilla / Q000601:surgery; D024343:Open Bite / Q000601:surgery* / Q000628:therapy; D009971:Orthodontics, Corrective; D056948:Orthognathic Surgical Procedures; D010027:Osteotomy / Q000379:methods; D019340:Osteotomy, Le Fort / Q000379:methods; D010155:Palatal Expansion Technique; D012008:Recurrence; D012189:Retrospective Studies; D012690:Serial Extraction; D055815:Young Adult