title: [Changes of hard tissues in patients with functional and skeletal Angel Class Ⅲ malocclusion after FRⅢ appliance treatment].
abstract: OBJECTIVE
  To compare changes of hard tissues before and after treatment of functional and skeletal Angle Class Ⅲ malocclusion with FRⅢ appliance.
  
  
  METHODS
  Thirty patients with functional and skeletal Angel Class Ⅲ malocclusion were selected and treated with FRⅢ appliance. SPSS 22.0 software package was performed for statistical analysis.
  
  
  RESULTS
  After treatment, there was no significant difference in SNA, S-Ptm, ANS-Ptm and Go-Po (P>0.05). ANB, ANS-Me, ANS-Me /N-Me were increased significantly (P<0.01). SNB, L1-NB, L1-MP were decreased significantly (P<0.05). MP-FH, Y axis, U1-NA, U1-NA (mm), U1-SN were increased significantly (P<0.05).
  
  
  CONCLUSIONS
  After FRⅢ appliance treatment of Angel Class Ⅲ malocclusion, the position of mandible may rotate clockwise downward and backward， with retrusion of the lower incisors and protrusion of the upper incisors.
authors.affiliation: .Department of Stomatology, First Affiliated Hospital of the Medical School, Shihezi University. Shihezi 832008, Xinjiang Uygur Autonomous Region, China. E-mail:58031401@qq.com.
authors.forename: Nan
authors.initials: N
authors.lastname: Zhang
authors.forename: Sun
authors.initials: S
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Zheng
authors.forename: Min
authors.initials: M
authors.lastname: Chen
authors.forename: Yu-Feng
authors.initials: YF
authors.lastname: Shen
authors.forename: Hong-Juan
authors.initials: HJ
authors.lastname: Yan
mesh_terms: D002508:Cephalometry; D005260:Female; D006801:Humans; D007180:Incisor; D008297:Male; D008312:Malocclusion, Angle Class II; D008313:Malocclusion, Angle Class III / Q000473:pathology* / Q000628:therapy; D008334:Mandible / Q000473:pathology*; D008437:Maxilla; D017289:Orthodontic Appliances, Functional