title: [A retrospective study for vertical control with high-pull headgear in the treatment of high angle cases].
abstract: OBJECTIVE
  To assess the effectiveness of vertical control with high-pull headgear in the treatment of high angle cases.
  
  
  METHODS
  Forty high angle cases (MP-SN >40 degrees) were included in this study and all the patients were treated with extraction. Twenty patients in the study group and control group, respectively. Totally 14 cephalometric measurements were selected for the assessment Paired t-test and independent t-test were used in the analysis.
  
  
  RESULTS
  No significant differences were found between the two groups (P > 0.05). In the study group, after treatment Y angle, MP-SN angle, MP-FH angle and U6-PP distance increased 1.9 degrees, 1.5 degrees, 2.3 degrees and 1.1 mm, respectively (P < 0.01).
  
  
  CONCLUSIONS
  High-pull headgear could not provide effective vertical control in high angle cases.
authors.affiliation: Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: Li
authors.initials: L
authors.lastname: Ouyang
authors.forename: Yan-Heng
authors.initials: YH
authors.lastname: Zhou
authors.forename: Min-Kui
authors.initials: MK
authors.lastname: Fu
authors.forename: Peng
authors.initials: P
authors.lastname: Ding
mesh_terms: D000293:Adolescent; D000328:Adult; D005115:Extraoral Traction Appliances; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000000981:diagnostic imaging / Q000628:therapy*; D052280:Orthodontic Anchorage Procedures; D011859:Radiography; D012189:Retrospective Studies; D016896:Treatment Outcome; D055815:Young Adult