title: Temporomandibular joint involvement in a cohort of patients with Juvenile Idiopatic Arthritis and evaluation of the effect induced by functional orthodontic appliance: clinical and radiographic investigation.
abstract: OBJECTIVE
  The aim of the study was to assess possible correlations between the clinical parameters of temporomandibular joint (TMJ) arthritis and pathologic MRI findings of the TMJ in patients affected by juvenile idiopathic arthritis (JIA), and the effect of a functional orthodontic therapy on the evolution of TMJ disorders.
  
  
  METHODS
  A prospective clinical and nuclear magnetic resonance (NMR) investigation was conducted on a sample of 53 patients (41 female, 12 male) with JIA, treated for 24 months with an Andresen appliance. The involvement of TMJ was defined by clinical and radiological signs. NMR assessments were performed in closed and maximum opening mouth position before (T0) and at the end of functional orthodontic therapy (T1).
  
  
  RESULTS
  Fifteen patients showed physical and radiologic TMJ abnormalities. Changes were not uniformly distributed among the different JIA subtypes. Patients with poliarticular JIA (≥5 peripheral joints affected) showed more destructive bony changes. No correlation existed between clinical symptoms and NMR alterations. Approximately one half of the patients experienced significant improvement of the TMJ and muscular pain using the Andresen appliance.
  
  
  CONCLUSIONS
  The prevalence of TMJ involvement in patients suffering of JIA, and the improvement of TMJ and muscular pain associated with the use of functional appliance found in the present study, suggest an alert for TMJ dysfunction in patients with JIA and demonstrate the utility of functional orthodontic therapy in preventing the morbidities associated with TMJ arthritis in JIA.
authors.affiliation: Department of Orthodontics and Paediatric Dentistry, Dental School, University of Messina, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Portelli
authors.affiliation: Department of Orthodontics and Paediatric Dentistry, Dental School, University of Messina, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Matarese
authors.affiliation: Department of Orthodontics and Paediatric Dentistry, Dental School, University of Messina, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Militi
authors.affiliation: Department of Orthodontics and Paediatric Dentistry, Dental School, University of Messina, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Logiudice
authors.affiliation: Department of Orthodontics and Paediatric Dentistry, Dental School, University of Messina, Italy.
authors.forename: R
authors.initials: R
authors.lastname: Nucera
authors.affiliation: Department of Orthodontics, Dental School, Vita Salute University, San Raffaele Hospital, Milan, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Lucchese
mesh_terms: D000202:Activator Appliances; D000293:Adolescent; D001171:Arthritis, Juvenile / Q000473:pathology / Q000628:therapy*; D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007574:Jaw Relation Record / Q000379:methods; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008335:Mandibular Condyle / Q000473:pathology; D008410:Masticatory Muscles / Q000473:pathology; D063806:Myalgia / Q000628:therapy; D016382:Orthodontic Appliance Design; D011446:Prospective Studies; D016059:Range of Motion, Articular / Q000502:physiology; D013705:Temporomandibular Joint Disorders / Q000473:pathology / Q000628:therapy*; D014716:Vertical Dimension