title: Quantitative measurements of the articular areas of mandibular condyles with temporomandibular joint disorders using magnetic resonance imaging.
abstract: OBJECTIVE
  The authors sought to clarify the variation in the condylar anterior functional surface (AFS) of patients with temporomandibular joint (TMJ) disorders using quantitative measurements by magnetic resonance imaging (MRI).
  
  
  METHODS
  MR images of 68 joints (2 males, 32 females) were used. The subjects were classified into three groups: with/without defects of cortical bone groups and a combination group without defects. The AFS was measured as the length between the protrusive point and the apex of the condyle on MRI (4-mm-thick slices), and the quad value of the length was defined as the area on the slice. The summed quad values of all slices were used as the AFS area. Differences in the areas among the three groups were compared by one-way analysis of variance (ANOVA).
  
  
  RESULTS
  The non-defect group had significantly larger AFS areas than the defect group.
  
  
  CONCLUSIONS
  Quantitative measurement on MR images clarified the changes in the condylar sagittal appearance.
authors.affiliation: a Department of Removable Prosthodontics , Tsurumi University School of Dental Medicine , Yokohama , Japan.
authors.forename: Kaori
authors.initials: K
authors.lastname: Kohi
authors.affiliation: b Department of Oral and Maxillofacial Radiology and Diagnosis , Tsurumi University School of Dental Medicine , Yokohama , Japan.
authors.forename: Chinami
authors.initials: C
authors.lastname: Igarashi
authors.affiliation: c Tsurumi University , Yokohama , Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Sugisaki
authors.affiliation: b Department of Oral and Maxillofacial Radiology and Diagnosis , Tsurumi University School of Dental Medicine , Yokohama , Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Osano
authors.affiliation: a Department of Removable Prosthodontics , Tsurumi University School of Dental Medicine , Yokohama , Japan.
authors.forename: Yohei
authors.initials: Y
authors.lastname: Sato
authors.affiliation: b Department of Oral and Maxillofacial Radiology and Diagnosis , Tsurumi University School of Dental Medicine , Yokohama , Japan.
authors.forename: Kaoru
authors.initials: K
authors.lastname: Kobayashi
authors.affiliation: a Department of Removable Prosthodontics , Tsurumi University School of Dental Medicine , Yokohama , Japan.
authors.forename: Chikahiro
authors.initials: C
authors.lastname: Ohkubo
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008335:Mandibular Condyle / Q000000981:diagnostic imaging* / Q000473:pathology*; D008875:Middle Aged; D013705:Temporomandibular Joint Disorders / Q000000981:diagnostic imaging* / Q000473:pathology*; D055815:Young Adult
keywords: Condylar anterior functional surface; Magnetic resonance image; Quantitative measurement; Remodeling; Temporomandibular joint; Temporomandibular joint disorders