title: Class II Division 1 malocclusion with severe overbite: cephalometric evaluation of the effects of orthodontic treatment.
abstract: OBJECTIVE
  To evaluate the effects of orthodontic treatment among individuals with Class II Division 1 malocclusion and severe overbite.
  
  
  METHODS
  The sample was made up of 70 patients (35 males and 35 females), with an average age of 11.6 years in pretreatment and 14.9 years in posttreatment. One hundred forty lateral cephalograms were obtained and traced by a single investigator. All individuals were treated with the edgewise technique associated with the Kloehn cervical extraoral headgear during the growth spurt, and simultaneously presented ANB > or = 5 degrees and overbite > or = 4 mm. Statistical analysis involved t tests for both independent and paired samples and the Spearman correlation test.
  
  
  RESULTS
  There were no significant differences between genders regarding the effects of treatment. The cases treated with extraction presented a greater reduction in the SNA angle. On average, all the variables of the study were significantly different when comparing the pretreatment and posttreatment conditions, except for the measurement of the mandibular plane angle (SNGoMe).
  
  
  CONCLUSIONS
  Correction of severe overbite occurred in virtue of the intrusion of the maxillary and mandibular incisors associated to a reduction of the maxillary prognathism and differential growth of the mandible, as well as dentoalveolar growth.
authors.affiliation: University of Vale do Rio Verde, Três Corações, Brazil. lsmarques21@yahoo.com.br
authors.forename: Leandro Silva
authors.initials: LS
authors.lastname: Marques
authors.forename: Maria Leticia
authors.initials: ML
authors.lastname: Ramos-Jorge
authors.forename: Mônica Tirre de Souza
authors.initials: MT
authors.lastname: Araujo
authors.forename: Ana Maria
authors.initials: AM
authors.lastname: Bolognese
mesh_terms: D002508:Cephalometry; D002648:Child; D005115:Extraoral Traction Appliances; D005260:Female; D006801:Humans; D008297:Male; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D008334:Mandible / Q000254:growth & development; D009971:Orthodontics, Corrective / Q000295:instrumentation / Q000379:methods*; D011378:Prognathism / Q000503:physiopathology / Q000628:therapy; D014081:Tooth Extraction