title: [Hard tissue changes in class III patients treated with maxillary protraction and rapid palatal expansion].
abstract: OBJECTIVE
  To investigate the hard tissue changes of class III patients treated with maxillary protraction and rapid palatal expansion.
  
  
  METHODS
  Twenty-three patients were included. All patients were treated with united method. The changes of hard tissue were compared.
  
  
  RESULTS
  Hard tissue grew forward and downward in natural state. After the treatment, the significant increase of S-A, Pt-A, PNS-A was found in maxilla, and the increment of PNS-A, Pt-A was larger than that of S-A. Pg and Me dislocated backward. Wits increased by 4.5 mm.
  
  
  CONCLUSIONS
  By applying maxillary protraction and rapid palatal expansion on Class III patients in the early permanent dentition, anterior displacement and increase in post-anterior dimension of maxilla were found. Mandible always rotated and slightly backward.
authors.affiliation: Department of Orthodontics, Beijing Hospital for Stomatology, Capital University of Medical Sciences, Beijing 100050, China.
authors.forename: J
authors.initials: J
authors.lastname: Jiang
authors.forename: C
authors.initials: C
authors.lastname: Ji
mesh_terms: D000293:Adolescent; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008313:Malocclusion, Angle Class III / Q000628:therapy*; D010155:Palatal Expansion Technique; D014070:Tooth / Q000254:growth & development*