title: Evaluation of internal derangement of the temporomandibular joint by panoramic radiographs compared with magnetic resonance imaging.
abstract: BACKGROUND
  Panoramic radiographs are routinely used in orthodontic diagnosis and treatment planning. It would be useful if these radiographs could also provide information about internal derangement (ID) of the temporomandibular joint (TMJ).
  
  
  METHODS
  The sample consisted of 168 condyles in 84 women. They underwent panoramic radiography on 1 of 3 machines and bilateral magnetic resonance imaging of the TMJ on 1 machine. Six panoramic variables were analyzed by 2-factor ANOVA to evaluate differences in condylar morphology with respect to status of the TMJ ID and type of panoramic machine.
  
  
  RESULTS
  Decreased condylar heights and distally inclined condyles were found in the patients with TMJ ID, irrespective of the type of panoramic machine used. The change became more severe as ID progressed to disk displacement without reduction.
  
  
  CONCLUSIONS
  This study suggests that some panoramic variables can help the clinician identify patients with potential ID.
authors.affiliation: Department of Orthodontics, Dental Research Institute and College of Dentistry, Seoul National University, Seoul, South Korea.
authors.forename: Sug-Joon
authors.initials: SJ
authors.lastname: Ahn
authors.forename: Tae-Woo
authors.initials: TW
authors.lastname: Kim
authors.forename: Dong-Yul
authors.initials: DY
authors.lastname: Lee
authors.forename: Dong-Seok
authors.initials: DS
authors.lastname: Nahm
mesh_terms: D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D005260:Female; D006801:Humans; D004204:Joint Dislocations / Q000000981:diagnostic imaging; D008279:Magnetic Resonance Imaging; D008335:Mandibular Condyle / Q000000981:diagnostic imaging / Q000473:pathology; D011862:Radiography, Panoramic; D018709:Statistics, Nonparametric; D019224:Temporomandibular Joint Disc / Q000000981:diagnostic imaging* / Q000473:pathology; D013705:Temporomandibular Joint Disorders / Q000000981:diagnostic imaging* / Q000473:pathology