title: Incisor crossbite and repaired unilateral cleft lip and palate: changes in jaw movement and temporalis muscle activity before and after edgewise treatment--case report.
abstract: OBJECTIVE
  To examine the changes in jaw movement and temporalis muscle activity of a patient with unilateral cleft lip and palate before and after edgewise treatment.
  
  
  METHODS
  Clinical case study.
  
  
  METHODS
  University dental hospital, department of orthodontics.
  
  
  METHODS
  A 12-year 3-month-old male with incisor crossbite, molar malocclusion, and repaired unilateral cleft lip and palate who had completed first-phase orthodontic treatment.
  
  
  METHODS
  This patient was treated with an edgewise appliance. Jaw movement and temporalis muscle activity during the chewing of a hard gummy jelly were recorded at 2 kHz from the sixth to the twentieth stroke before edgewise treatment and after a retention period of 2 years.
  
  
  RESULTS
  Optimum intercuspation of teeth was achieved. The reversed crossing jaw-movement pattern before treatment changed to a normal grinding after treatment. The posterior temporalis muscle on the chewing side exhibited an earlier burst than the contralateral one during chewing at the post-treatment stage, as is observed in cases with good occlusion.
  
  
  CONCLUSIONS
  Improvement in the occlusion using an edgewise appliance is necessary for acquiring a good masticatory function in patients with incisor crossbite, molar malocclusion, and cleft lip and palate.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Nara Medical University, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Miyawaki
authors.forename: K
authors.initials: K
authors.lastname: Takada
mesh_terms: D002648:Child; D002971:Cleft Lip / Q000601:surgery*; D002972:Cleft Palate / Q000601:surgery*; D003766:Dental Occlusion; D004576:Electromyography; D005500:Follow-Up Studies; D006801:Humans; D007180:Incisor / Q000473:pathology*; D008297:Male; D008310:Malocclusion / Q000503:physiopathology / Q000628:therapy*; D008334:Mandible / Q000503:physiopathology*; D008409:Mastication / Q000502:physiology; D008963:Molar / Q000473:pathology; D009967:Orthodontic Appliances; D018704:Orthodontic Retainers; D013703:Temporal Muscle / Q000503:physiopathology*; D014087:Tooth Movement Techniques