title: [Cone beam computed tomography in the diagnosis of temporomandibular joint osteoarthrosis].
abstract: OBJECTIVE
  To evaluate the clinical use of cone beam dental CT in the diagnosis of temporomandibular joint osteoarthrosis.
  
  
  METHODS
  Forty-eight cases diagnosed as temporomandibular joint osteoarthrosis (OA) and disk displacement with or without reduction accompanied by OA changes were included, and a total of 96 joints received both trans-pharyngeal radiography and cone beam CT (CBCT) examination. The detectable rate for OA radiographic changes was compared between the two examinations.
  
  
  RESULTS
  The radiographic appearances of osteoarthrotic condyle included six types: loss of the lamina dura density of condyle surface (type I), destructive and erosive bone changes (type II), flattening of the articular surface (type III), sclerosis (type IV), osteophytes (type V), and false cyst change (type VI). The detectable ratio of CBCT for all types of osteoarthrosis was 65.63%, 37.50%, 27.08%, 31.25%, 28.13%, 1.04%, respectively, and the detectable ratio of trans-pharyngeal radiographs was 52.08%, 19.79%, 32.29%, 23.96%, 12.50%, 2.08% respectively. Intraobserver and interobserver reproducibility for type I and type II was in good agreement with both the trans-pharyngeal radiographs and CBCT, Kappa > 0.60.
  
  
  CONCLUSIONS
  CBCT had higher detectable rates for pathological changes of osteoarthrosis, and could show the exact location, size, and the types of pathological changes. CBCT may be used as a measure in evaluating disease severity and progression, and in clinical trials of disease treatment.
authors.affiliation: Center for Temporomadibular Disorders and Orofacial Pain, Peking University School and Hospital of Stomatology, Beijing 100081, China. kqkyfu@bjmu.edu.cn
authors.forename: Kai-Yuan
authors.initials: KY
authors.lastname: Fu
authors.forename: Wan-Lin
authors.initials: WL
authors.lastname: Zhang
authors.forename: Deng-Gao
authors.initials: DG
authors.lastname: Liu
authors.forename: Hui-Min
authors.initials: HM
authors.lastname: Chen
authors.forename: Xu-Chen
authors.initials: XC
authors.lastname: Ma
mesh_terms: D000293:Adolescent; D000328:Adult; D054893:Cone-Beam Computed Tomography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013704:Temporomandibular Joint / Q000000981:diagnostic imaging; D013705:Temporomandibular Joint Disorders / Q000000981:diagnostic imaging*; D055815:Young Adult