title: The effect of a Clark twin block on mandibular motion: a case report.
abstract: OBJECTIVE
  To investigate mandibular motion in six degrees of freedom before, during and after twin block treatment in one individual.
  
  
  METHODS
  The appliance was worn for eight months, and motion recordings, using a 12-camera opto-electric system, were captured prior to placement of a twin block appliance and 2, 4, 14 and 52 weeks after insertion.
  
  
  RESULTS
  The wide variations in mandibular motion that accompany twin block wear disappeared post-treatment, except for an increase in anteroposterior movement of the mandible.
  
  
  CONCLUSIONS
  Twin block therapy appears to affect mandibular motion temporarily.
authors.affiliation: Royal Children's Hospital, Brisbane, Queensland, Australia.
authors.forename: Catherine
authors.initials: C
authors.lastname: O'Shea
authors.forename: Andrew
authors.initials: A
authors.lastname: Quick
authors.forename: Gillian
authors.initials: G
authors.lastname: Johnson
authors.forename: Allan
authors.initials: A
authors.lastname: Carman
authors.forename: Peter
authors.initials: P
authors.lastname: Herbison
mesh_terms: D002648:Child; D005115:Extraoral Traction Appliances; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008312:Malocclusion, Angle Class II / Q000503:physiopathology / Q000628:therapy*; D008334:Mandible / Q000503:physiopathology*; D008335:Mandibular Condyle / Q000503:physiopathology; D016382:Orthodontic Appliance Design; D017289:Orthodontic Appliances, Functional; D016059:Range of Motion, Articular / Q000502:physiology; D012399:Rotation; D013704:Temporomandibular Joint / Q000503:physiopathology