title: Evaluation of the usefulness of magnetic resonance imaging in the assessment of the thickness of the roof of the glenoid fossa of the temporomandibular joint.
abstract: OBJECTIVE
  The aim of this study was to evaluate the usefulness of magnetic resonance imaging (MRI) in measuring thickness of the roof of the glenoid fossa (RGF) of the temporomandibular joint (TMJ).
  
  
  METHODS
  Minimum RGF thickness in 95 TMJs of 59 patients with temporomandibular disorders were measured and compared on both sagittal-section MRI and cone-beam computed tomography (CBCT). RGF thickness on MRI was also compared with MRI, CBCT, and arthrographic findings.
  
  
  RESULTS
  Minimum RGF thickness was greater on MRI (1.46 mm) than on CBCT (0.90 mm). Spearman's correlation coefficient by rank for these 2 types of measurements was 0.63. RGF thickness on MRI differed significantly between those with and without degenerative joint changes (1.69 vs 1.32 mm; P < .01) and between those with and without disk displacement (1.58 vs 1.35 mm; P = .04), but showed no associations with disk deformity, joint effusion, or disk perforation.
  
  
  CONCLUSIONS
  MRI is useful in measuring RGF thickness from diagnostic as well as radiation protection standpoints.
authors.affiliation: Department of Oral and Maxillofacial Radiology, Nihon University, School of Dentistry, Tokyo, Japan.
authors.forename: Yukiko
authors.initials: Y
authors.lastname: Kai
authors.forename: Kunihito
authors.initials: K
authors.lastname: Matsumoto
authors.forename: Ken-ichiro
authors.initials: K
authors.lastname: Ejima
authors.forename: Masao
authors.initials: M
authors.lastname: Araki
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Yonehara
authors.forename: Kazuya
authors.initials: K
authors.lastname: Honda
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001175:Arthrography / Q000379:methods; D002508:Cephalometry / Q000379:methods; D054893:Cone-Beam Computed Tomography / Q000379:methods; D005260:Female; D006801:Humans; D004204:Joint Dislocations / Q000000981:diagnostic imaging / Q000473:pathology; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000000981:diagnostic imaging / Q000473:pathology; D013582:Synovial Fluid / Q000000981:diagnostic imaging; D013701:Temporal Bone / Q000000981:diagnostic imaging / Q000473:pathology*; D013704:Temporomandibular Joint / Q000000981:diagnostic imaging / Q000473:pathology*; D019224:Temporomandibular Joint Disc / Q000000981:diagnostic imaging / Q000473:pathology; D013705:Temporomandibular Joint Disorders / Q000000981:diagnostic imaging / Q000473:pathology*; D055815:Young Adult