title: Changes in mandibular position in treated Class II division 2 malocclusions in growing and non-growing subjects.
abstract: OBJECTIVE
  To determine changes in mandibular position after the treatment of patients presenting with Class II division 2 malocclusions and to test the null hypothesis that there is posterior displacement of the mandible in these patients, in comparison with a control group of Class II division 1 subjects.
  
  
  METHODS
  The assessed data consisted of pre- and post-treatment cephalometric radiographs of 77 subjects identified with Class II division 1 and Class II division 2 malocclusions matched according to age, gender and treatment duration. All completed fixed appliance orthodontic treatment. The changes in the position of point B, Pogonion and Articulare were determined at the end of treatment by superimposing the cephalometric radiographs on Sella-Nasion line at Sella. Thirteen cephalometric parameters including the distance between Basion and Articular (Ba-Art) were measured at each stage.
  
  
  RESULTS
  In both groups, SNB angle, SNPog angle and Ba-Art distance showed no statistically significant changes. Pogonion was displaced significantly in a forward and downward direction in the growing group, with no significant differences identified between Class I division 1 and Class II division 2 subjects.
  
  
  CONCLUSIONS
  The null hypothesis that there is posterior displacement of the mandible in Class II division 2 malocclusion is rejected. The growth pattern of the mandible in both divisions of a Class I malocclusion after orthodontic treatment was found to be similar
authors.forename: Kazem
authors.initials: K
authors.lastname: AL-Nimri
authors.forename: Mohamad
authors.initials: M
authors.lastname: Abo-Zomor
authors.forename: Sawsan
authors.initials: S
authors.lastname: Alomari
mesh_terms: D000293:Adolescent; D000328:Adult; D059925:Anatomic Landmarks / Q000473:pathology; D016022:Case-Control Studies; D002508:Cephalometry / Q000379:methods; D002648:Child; D002680:Chin / Q000473:pathology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008312:Malocclusion, Angle Class II / Q000473:pathology / Q000628:therapy*; D008334:Mandible / Q000254:growth & development / Q000473:pathology*; D008335:Mandibular Condyle / Q000473:pathology; D008445:Maxillofacial Development / Q000502:physiology*; D009295:Nasal Bone / Q000473:pathology; D012189:Retrospective Studies; D012658:Sella Turcica / Q000473:pathology; D019291:Skull Base / Q000473:pathology; D055815:Young Adult