title: Orthodontic management of ectopic maxillary first permanent molars: a case report.
abstract: BACKGROUND
  Ectopic position of a maxillary first permanent molar results in a local malocclusion within the mixed dentition and occurs when the tooth erupts more mesially to its normal path of eruption. The prevalence of ectopic maxillary first permanent molars has been reported at approximately 4 per cent. Possible treatment options include the extraction of the primary second molar and the placement of a space maintainer, extraction of the primary second molar and later regaining lost space during comprehensive treatment of the malocclusion or implementing interceptive treatment to disimpact the maxillary first permanent molar and preserving arch length.
  
  
  OBJECTIVE
  To describe the aetiology, classification and management of ectopic maxillary first permanent molars and to present two cases of intervention using simple orthodontic appliances.
  
  
  METHODS
  A sectional fixed appliance and orthodontic separators were used to correct the ectopic maxillary first permanent molars.
  
  
  RESULTS
  Successful disimpaction resulted in normal vertical eruption and arch length preservation.
  
  
  CONCLUSIONS
  Management of ectopic maxillary first molars can be successfully achieved in the mixed dentition.
authors.affiliation: Guy's and St Thomas NHS Foundation Trust, Department of Orthodontics and Pediatrics, London and Queen Victoria Hospital NHS Foundation Trust, East Grinstead, West Sussex, United Kingdom.
authors.forename: Jadbinder
authors.initials: J
authors.lastname: Seehra
authors.forename: Lindsay
authors.initials: L
authors.lastname: Winchester
authors.forename: Andrew T
authors.initials: AT
authors.lastname: DiBiase
authors.forename: Martyn T
authors.initials: MT
authors.lastname: Cobourne
mesh_terms: D002648:Child; D003818:Dentition, Mixed; D005260:Female; D006801:Humans; D008312:Malocclusion, Angle Class II / Q000628:therapy; D008437:Maxilla; D008963:Molar / Q000473:pathology; D009972:Orthodontics, Interceptive / Q000295:instrumentation*; D014079:Tooth Eruption, Ectopic / Q000628:therapy*; D014095:Tooth, Impacted / Q000628:therapy