title: Magnetic resonance imaging diagnosis of the temporomandibular joint in patients with orthodontic appliances.
abstract: OBJECTIVE
  The purpose of this study was to investigate the accuracy of magnetic resonance imaging diagnosis of the temporomandibular joint in those with orthodontic appliances by comparing magnetic resonance images of the temporomandibular joints with and without orthodontic appliances.
  
  
  METHODS
  Magnetic resonance imaging was performed in a total of 20 temporomandibular joints before and after the insertion of 6 kinds of orthodontic appliances (types 1-6), and the magnetic resonance images were compared.
  
  
  RESULTS
  With respect to disk position, the diagnostic accuracy was 80%, 75%, 70%, 70%, 65%, and 60% in order from type 1 through type 6. The distribution of stages for the assessment of condylar configurations was 80%, 55%, 40%, 40%, 20%, and 10% in order from type 1 through type 6. No significant changes were found in the condylar head marrow signals.
  
  
  CONCLUSIONS
  Magnetic resonance imaging is performed in orthodontic patients preferably by using ceramic brackets in the front teeth and direct bonding tubes in the molar teeth while removing arch wires.
authors.affiliation: Nihon University at Matsudo, Department of Orthodontics, School of Dentistry, Sakaecho-Nishi, Matsudo, Chiba, Japan. okano@mascat.nihon-u.ac.jp
authors.forename: Yoshie
authors.initials: Y
authors.lastname: Okano
authors.forename: Mitsuaki
authors.initials: M
authors.lastname: Yamashiro
authors.forename: Takashi
authors.initials: T
authors.lastname: Kaneda
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Kasai
mesh_terms: D000328:Adult; D016477:Artifacts; D002516:Ceramics; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008335:Mandibular Condyle / Q000473:pathology; D008670:Metals; D016382:Orthodontic Appliance Design; D016910:Orthodontic Brackets; D012680:Sensitivity and Specificity; D019224:Temporomandibular Joint Disc / Q000473:pathology; D013705:Temporomandibular Joint Disorders / Q000175:diagnosis*
chemical_list: D008670:Metals