title: [Comparative study on the clinical appearances between acute and chronic anterior disc displacement without reduction].
abstract: OBJECTIVE
  To compare the clinical appearances of TMD patients between acute and chronic anterior disc displacement without reduction.
  
  
  METHODS
  Successive one hundred TMD patients with fully recorded documents diagnosed as anterior disc displacement without reduction (ADDw/oR) were included, 45 acute and 55 chronic ADDw/oR patients. Clinical appearances including signs and symptoms, maximal mouth opening, Fricton's craniomandibular index, condylar bone changes on radiograms, findings on arthrograms and MRI were compared.
  
  
  RESULTS
  The main reason for asking treatment was joint pain in chronic, instead of limited mouth opening in acute patients. Clinical symptoms such as pain and limited mandibular movement showed improvement in chronic patients. Fricton's joint dysfunction index was higher in acute than in chronic patients, but muscle palpation index was higher in chronic than in acute patients, but Fricton's craniomandibular index was not significantly different between chronic and acute patients. The destructive bone changes of condyle on radiograms, the damage of stretched disc attachment on arthrograms and the morphological deformed disc on MRI were more frequently found in chronic than in acute patients.
  
  
  CONCLUSIONS
  In acute patients there is a great likelihood that tissues are healthy and not morphologically changed, we suggest that early and efficacious intervention should be made to reposition the anterior displaced disc that may block the progress of pathological impairment to both the disc and the condyle of TMJ.
authors.affiliation: Center for Temporomandibular Disorders and Orofacial Pain, Peking University School of Stomatology, Beijing 100081, China. kqkyfu@bjmu.edu.cn
authors.forename: Kai-Yuan
authors.initials: KY
authors.lastname: Fu
authors.forename: Han-Bing
authors.initials: HB
authors.lastname: Zhang
authors.forename: Yan-Ping
authors.initials: YP
authors.lastname: Zhao
authors.forename: Xu-Chen
authors.initials: XC
authors.lastname: Ma
authors.forename: Zhen-Kang
authors.initials: ZK
authors.lastname: Zhang
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002908:Chronic Disease; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D019224:Temporomandibular Joint Disc / Q000473:pathology*; D013705:Temporomandibular Joint Disorders / Q000175:diagnosis* / Q000628:therapy; D055815:Young Adult