title: [Orthodontic diagnosis and treatment of unilateral posterior cross-bite].
abstract: OBJECTIVE
  The aim of this study is to investigate the clinical diagnosis and treatment of unilateral posterior cross-bite and to provide information for correct treatment of this disease.
  
  
  METHODS
  The X-ray examination of patients' heads in the posterior-anterior position, analysis of pantomorphic films and model measurement were used for the diagnosis of unilateral cross-bite. According to these data, three types of unilateral posterior cross-bite would be classified, and different orthodontic appliances would be applied in the following treatment, including separate plate removable expansion appliances, Quad-helix appliances, narrowing dental arch and inter-arch elastics.
  
  
  RESULTS
  A total of 78 cases of unilateral posterior cross-bite were treated by different techniques in a manner consistent with the classification. All of the clinical results of treatment were satisfactory and successful.
  
  
  CONCLUSIONS
  If diagnosis is correct, and suitable treatment methods are chosen, unilateral cross-bite can be treated successful.
authors.affiliation: Qindu Stomatological College, Fourth Military Medical University.
authors.forename: Y
authors.initials: Y
authors.lastname: Duan
authors.forename: Y
authors.initials: Y
authors.lastname: Sun
authors.forename: F
authors.initials: F
authors.lastname: Wang
authors.forename: Y
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000202:Activator Appliances; D000293:Adolescent; D000328:Adult; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000175:diagnosis / Q000628:therapy*; D010155:Palatal Expansion Technique / Q000295:instrumentation*