title: Factors related to the incidence of anterior disc displacement without reduction and bony changes of the temporomandibular joint in patients with anterior open bite.
abstract: OBJECTIVE
  We aimed to investigate factors related to the prevalence of anterior disc displacement without reduction (ADDwoR) and bony changes of the condylar head (bony changes) in the temporomandibular joints (TMJs) of patients with anterior open bite.
  
  
  METHODS
  Subjects are comprised of 36 preoperative patients (72 joints) with skeletal anterior open bite without facial asymmetry who had undergone orthognathic surgery at the Hokkaido University Hospital; magnetic resonance imaging of the TMJ and cephalometric analysis were performed before treatment. Logistic regression analysis was performed to clarify relationships among age, overbite, overjet, ANB angle, sella to nasion (SN) to mandibular plane angle (SN-MP angle), SN to ramus plane angle (GZN angle), gonial angle, and incidence of ADDwoR or bony changes in patients with anterior open bite.
  
  
  RESULTS
  Fifteen patients had bilateral ADDwoR, and five patients had unilateral ADDwoR; 17 patients had bilateral bony changes, and five patients had unilateral bony changes. SN-MP angle was greater in 20 patients with ADDwoR than that in 16 patients without ADDwoR (p < 0.05). GZN angle was greater in the 20 patients showing bony changes than that in the 16 patients without bony changes (p < 0.05).
  
  
  CONCLUSIONS
  In terms of dentofacial morphology, SN-MP angle appears to be associated with the incidence of ADDwoR, and GZN angle appears to be associated with bony changes in the TMJ.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Division of Oral Pathobiological Science, Graduate School of Dental Medicine, Hokkaido University, Kita 13 Nishi 7, Kita-ku, Sapporo, 060-8586, Japan, ooi@den.hokudai.ac.jp.
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Ooi
authors.forename: Shinya
authors.initials: S
authors.lastname: Yura
authors.forename: Nobuo
authors.initials: N
authors.lastname: Inoue
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Totsuka
mesh_terms: D000367:Age Factors; D002508:Cephalometry / Q000379:methods; D006801:Humans; D004204:Joint Dislocations / Q000209:etiology*; D008279:Magnetic Resonance Imaging / Q000379:methods; D008334:Mandible / Q000473:pathology; D008335:Mandibular Condyle / Q000473:pathology*; D008437:Maxilla / Q000473:pathology; D009295:Nasal Bone / Q000473:pathology; D024343:Open Bite / Q000150:complications* / Q000601:surgery; D056948:Orthognathic Surgical Procedures / Q000379:methods; D057887:Overbite / Q000473:pathology; D012658:Sella Turcica / Q000473:pathology; D019224:Temporomandibular Joint Disc / Q000473:pathology*; D013705:Temporomandibular Joint Disorders / Q000209:etiology*