title: Comparison of transverse dimensional changes in surgical skeletal Class III patients with and without presurgical orthodontics.
abstract: OBJECTIVE
  To investigate transverse dimensional changes of dental arches in surgical skeletal Class III patients with and without presurgical orthodontics.
  
  
  METHODS
  Thirty-six patients with skeletal Class III were included and grouped into those with or without presurgical orthodontics. Eighteen patients (mean age, 22.3 +/- 3.8 years) with presurgical orthodontics (mean presurgical orthodontic treatment time, 176.3 +/- 38.3 days) were in the orthodontics-first (OF) group; the other 18 patients (mean age, 23.3 +/- 4.2 years) without presurgical orthodontics were in the surgery-first (SF) group. The posteroanterior cephalograms initially, before surgery, immediately after surgery, and 1 year after surgery were traced and analyzed. The inclination change of canines and molars was measured to interpret the changes of transverse dimension in both dental arches. Paired and unpaired t tests were performed to test intra- and intergroup differences (P < .05).
  
  
  RESULTS
  Dental changes in transverse planes demonstrated a similar trend in both groups. The maxillary canines were buccally tilted (SF vs OF group, 1.7 degrees vs 1.9 degrees), the maxillary molars were lingually tilted (SF group vs OF group, -4.7 degrees vs -1.0 degrees), the mandibular canines were lingually tilted (SF group vs OF group, 2.9 degrees vs 2.8 degrees), and the mandibular molars were buccally tilted (SF group vs OF group, -6.1 degrees vs -5.4 degrees).
  
  
  CONCLUSIONS
  The magnitude and trend of transverse dental changes in patients with surgical skeletal Class III were similar whether receiving presurgical orthodontics or not.
authors.affiliation: Department of Craniofacial Orthodontics, Chang Gung Memorial Hospital, Taipei, Taiwan.
authors.forename: Yu-Chih
authors.initials: YC
authors.lastname: Wang
authors.forename: Ellen Wen-Ching
authors.initials: EW
authors.lastname: Ko
authors.forename: Chiung-Shing
authors.initials: CS
authors.lastname: Huang
authors.forename: Yu-Ray
authors.initials: YR
authors.lastname: Chen
authors.forename: Teruko
authors.initials: T
authors.lastname: Takano-Yamamoto
mesh_terms: D002508:Cephalometry; D003481:Cuspid / Q000503:physiopathology; D003724:Dental Arch / Q000473:pathology*; D006801:Humans; D008313:Malocclusion, Angle Class III / Q000473:pathology* / Q000601:surgery / Q000628:therapy*; D008963:Molar / Q000503:physiopathology; D009971:Orthodontics, Corrective; D056948:Orthognathic Surgical Procedures; D011182:Postoperative Care; D011300:Preoperative Care; D012189:Retrospective Studies; D055815:Young Adult