title: Temporomandibular joint intermittent closed lock: clinic and magnetic resonance imaging findings.
abstract: OBJECTIVE
  This study was carried out to describe the clinical and magnetic resonance imaging (MRI) findings of patients with intermittent closed lock (ICL) of the temporomandibular joint (TMJ).
  
  
  METHODS
  This retrospective study included 58 joints with ICL and 526 joints without ICL as controls. We compared the MRI findings between the patients with and without ICL and investigated clinical and MRI finding of ICL patients. We divided ICL patients into 2 groups based on the treatment efficacy: effective and ineffective.
  
  
  RESULTS
  There were significant differences in the prevalence of disk deformity between the joints with and without ICL. Masticatory muscle pain was observed in 41.7% of the effective group and in 80% of the ineffective group, respectively.
  
  
  CONCLUSIONS
  These results suggest that there is a relationship among the onset of ICL and disk deformation. Masticatory musclepain was significantly observed in the ineffective group.
authors.affiliation: Clinical Fellow, Department of Oral and Maxillofacial Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan. Electronic address: Kounosur@tmd.ac.jp.
authors.forename: Namiaki
authors.initials: N
authors.lastname: Takahara
authors.affiliation: Chief, Department of Dentistry and Oral Surgery, Hitachi, Ltd., Hitachinaka General Hospital, Hitachinaka, Japan.
authors.forename: Hideki
authors.initials: H
authors.lastname: Imai
authors.affiliation: Clinical Fellow, Department of Oral and Maxillofacial Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Nakagawa
authors.affiliation: Clinical Fellow, Department of Oral and Maxillofacial Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
authors.forename: Kanako
authors.initials: K
authors.lastname: Sumikura
authors.affiliation: Associate Professor, Department of Oral and Maxillofacial Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
authors.forename: Fumihiko
authors.initials: F
authors.lastname: Tsushima
authors.affiliation: Professor, Department of Oral and Maxillofacial Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
authors.forename: Ken
authors.initials: K
authors.lastname: Omura
mesh_terms: D000293:Adolescent; D000328:Adult; D005157:Facial Pain / Q000175:diagnosis / Q000503:physiopathology; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008410:Masticatory Muscles / Q000503:physiopathology; D008875:Middle Aged; D010147:Pain Measurement; D016059:Range of Motion, Articular / Q000502:physiology; D012189:Retrospective Studies; D019224:Temporomandibular Joint Disc / Q000503:physiopathology; D013705:Temporomandibular Joint Disorders / Q000175:diagnosis* / Q000503:physiopathology*