title: Temporomandibular joint evaluation with magnetic resonance imaging in children with functional unilateral posterior crossbite, treated with rapid maxillary expansion.
abstract: BACKGROUND
  The purpose of this prospective study was to evaluate qualitatively articular disc position and configuration of the temporomandibular joint (TMJ) with magnetic resonance imaging (MRI) in children with functional unilateral posterior crossbite (FUPXB) treated with Haas-type orthopedic appliances.
  
  
  METHODS
  The sample included 30 Brazilian children (60 TMJs) of both sexes (8 boys, 22 girls), aged 6.8 to 14.2 years (mean, 10.5 years; SD, 2.1 years). The MRIs were acquired in closed-mouth (CM), maximum-intercuspal (MI), and open-mouth (OM) positions in 3 stages of treatment: initial (T1), at the beginning of treatment; intermediate (T2), immediately after the removal of the expander, and final (T3), 9 months later, at the end of the observation period.
  
  
  RESULTS
  No changes were found in articular disc positions of 96.6% of the TMJs in the CM and MI positions, and in 95% in the OM position at T1, T2, and T3. For the articular disc configuration, no changes were observed in 96.66% of the TMJs in the CM and MI positions, and in all TMJs in the OM position, at T1, T2, and T3.
  
  
  CONCLUSIONS
  On average, this treatment method did not change articular disc positions and configurations.
authors: Department of Orthodontics, Santa Cecília University, Santos, Brazil. mmasi@litoral.com.br.
authors: Marcia
authors: M
authors: Masi
authors: Henrique M
authors: HM
authors: Lederman
authors: Helio K
authors: HK
authors: Yamashita
authors: Luís Antônio
authors: LA
authors: de Arruda Aidar
mesh_terms: D000293:Adolescent; D002648:Child; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008310:Malocclusion / Q000473:pathology* / Q000628:therapy*; D008335:Mandibular Condyle / Q000473:pathology; D009967:Orthodontic Appliances; D010155:Palatal Expansion Technique / Q000295:instrumentation; D011446:Prospective Studies; D019224:Temporomandibular Joint Disc / Q000473:pathology*