title: Evaluation of skeletal stability after surgical-orthodontic correction of skeletal open bite with mandibular counterclockwise rotation using modified inverted L osteotomy.
abstract: OBJECTIVE
  To evaluate the surgical-orthodontic stability of treating skeletal open bite patients with mandibular ramus osteotomies using a modified inverted L osteotomy (M-ILO) and counterclockwise rotation of the mandible stabilized with rigid fixation.
  
  
  METHODS
  In a retrospective review, 12 patients with skeletal open bites (8 females, 4 males) who received mandibular M-ILO in the period 2004-2007 at Tohoku University Hospital were studied. Lateral cephalograms were taken immediately before surgery (T1), immediately after surgery (T2), and at 1 yr after surgery (T3). Cephalometric analysis for point B, pogonion, menton, and mandibular plane angle was obtained at the designated time intervals.
  
  
  RESULTS
  Mandibular counterclockwise rotation showed stability for point B, pogonion, and menton referred to X-Y coordinate, and for mandibular plane angle. The mean value for each variable was compared between T2 and T3. No statistically significant change was observed for all variables.
  
  
  CONCLUSIONS
  With a well-positioned maxilla, skeletal open bite can be successfully treated using M-ILO. Mandibular counterclockwise rotation showed stability at 1 yr after surgery.
authors.affiliation: Department of Maxillofacial Surgery, Graduate School of Dentistry, Tohoku University, Aoba-ku, Sendai, Japan. zeimich@hotmail.com
authors.forename: Zaher
authors.initials: Z
authors.lastname: Aymach
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Nei
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kawamura
authors.forename: Joseph
authors.initials: J
authors.lastname: Van Sickels
mesh_terms: D000293:Adolescent; D000328:Adult; D002508:Cephalometry; D005260:Female; D006801:Humans; D019248:Jaw Fixation Techniques / Q000295:instrumentation; D008297:Male; D008334:Mandible / Q000601:surgery*; D024343:Open Bite / Q000601:surgery* / Q000628:therapy; D009971:Orthodontics, Corrective; D056948:Orthognathic Surgical Procedures / Q000295:instrumentation / Q000379:methods*; D010027:Osteotomy / Q000295:instrumentation / Q000379:methods; D012189:Retrospective Studies; D055502:Secondary Prevention; D055815:Young Adult