title: The natural course of anterior disc displacement without reduction in the temporomandibular joint: follow-up at 6, 12, and 18 months.
abstract: OBJECTIVE
  The purpose of this study was to examine the natural course of anterior disc displacement without reduction in the temporomandibular joint (TMJ).
  
  
  METHODS
  The subjects were patients who had been diagnosed as having anterior disc displacement without reduction in the TMJ, but who had not undergone any treatment. Forty-four patients were followed for 6 months, 38 for 12 months, and 22 for 18 months. Clinical signs and symptoms were evaluated at each follow-up, and the incidence of successful resolution was determined using the criteria established in 1984 by the American Association of Oral and Maxillofacial Surgeons.
  
  
  RESULTS
  The range of motion increased at each time during the follow-up period. Tenderness in the TMJ and the masticatory muscles was alleviated, but the noise in the TMJ remained unchanged at each follow-up time. The incidence of successful resolution was 34.1% at 6 months, 50.0% at 12 months, and 68.2% at 18 months.
  
  
  CONCLUSIONS
  The clinical signs and symptoms of anterior disc displacement without reduction tend to be alleviated during the natural course of the condition. This should be taken into consideration when anterior disc displacement without reduction is treated.
authors.affiliation: Department of Oral and Maxillofacial Surgery I. Tohoku University School of Dentistry, Sendai, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Sato
authors.forename: H
authors.initials: H
authors.lastname: Kawamura
authors.forename: H
authors.initials: H
authors.lastname: Nagasaka
authors.forename: K
authors.initials: K
authors.lastname: Motegi
mesh_terms: D000293:Adolescent; D000328:Adult; D005157:Facial Pain / Q000503:physiopathology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D004204:Joint Dislocations / Q000503:physiopathology*; D008297:Male; D008410:Masticatory Muscles / Q000503:physiopathology; D008875:Middle Aged; D011379:Prognosis; D016059:Range of Motion, Articular; D012075:Remission, Spontaneous; D013016:Sound; D013704:Temporomandibular Joint / Q000503:physiopathology; D019224:Temporomandibular Joint Disc / Q000503:physiopathology*