title: Comparison of skeletal changes between female adolescents and adults with hyperdivergent Class II Division 1 malocclusion after orthodontic treatment.
abstract: OBJECTIVE
  To compare the skeletal changes between female hyperdivergent adolescents and adults with Class II Division 1 malocclusion after orthodontic treatment.
  
  
  METHODS
  Thirty adolescent girls and 30 adult women both with hyperdivergent Class II Division 1 malocclusions were selected. The 2 groups were matched by both treatment period and treatment method. Cephalometric radiographs taken before and after treatment were traced and measured. Data were statistically examined.
  
  
  RESULTS
  After treatment, SNA decreased significantly in both groups. SNB remained unchanged in the adolescent group, while it decreased in the adult group. ANB decreased significantly only in the adolescent group and remained unchanged in the adult group. Obvious growth was found in the adolescent group. Ar-Gn, Ar-Go, N-Me and S-Go increased significantly in adolescents. In the adult group, N-Me and ANS'-Me increased after treatment, but with less magnitude than those in the adolescent group. All the angular measures (MP-SN, PP-SN, Ar- Go-Gn and N-S-Ba) remained quite stable in both the adolescent and adult groups.
  
  
  CONCLUSIONS
  Although obvious vertical growth was found in the female hyperdivergent adolescent Class II Division 1 group, no clockwise rotation of the mandible and no mandibular catch-up growth were found. Vertical growth of the mandible was helpful in maintaining the MP-SN angle with conventional orthodontic mechanism in the adolescent group.
authors.affiliation: Department of Orthodontics, The 3rd Dental Center, Peking University School, Beijing, People's Republic of China. yunding666@126.com
authors.forename: Yun
authors.initials: Y
authors.lastname: Ding
authors.forename: Jian Hui
authors.initials: JH
authors.lastname: Zhao
authors.forename: Jin Rong
authors.initials: JR
authors.lastname: Deng
authors.forename: Xiu Jing
authors.initials: XJ
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D000328:Adult; D016022:Case-Control Studies; D002508:Cephalometry / Q000379:methods; D002648:Child; D005147:Facial Bones / Q000254:growth & development / Q000473:pathology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008312:Malocclusion, Angle Class II / Q000473:pathology / Q000628:therapy*; D008334:Mandible / Q000254:growth & development / Q000473:pathology; D008335:Mandibular Condyle / Q000254:growth & development / Q000473:pathology; D008437:Maxilla / Q000473:pathology; D009295:Nasal Bone / Q000254:growth & development / Q000473:pathology; D010159:Palate / Q000254:growth & development / Q000473:pathology; D011627:Puberty / Q000502:physiology; D012658:Sella Turcica / Q000473:pathology; D014087:Tooth Movement Techniques / Q000379:methods*; D014716:Vertical Dimension; D055815:Young Adult