title: [A study on the change of caries activity of children with fixed orthodontic treatment].
abstract: OBJECTIVE
  To investigate the change of caries activity in children with fixed appliance.
  
  
  METHODS
  30 children of permanent dentition were treated with edgewise appliance. CAT was used to test the degree of caries activity before the orthodontic treatment, at the first week, at the first month, at the third month and at the sixth month of appliance bonding respectively.
  
  
  RESULTS
  Compared with pre-treatment, there was a significant difference of CAT at the first, third and sixth month of treatment; compared with the first week of treatment, there was also a significant difference of CAT at the third and sixth month of treatment.
  
  
  CONCLUSIONS
  The CAT degree increases in children with fixed orthodontic appliance and these children are more sensitive to dental caries.
authors.affiliation: Institute of Pediatric Dentistry, Tongji University, Shanghai 200072, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Hua
authors.forename: Z
authors.initials: Z
authors.lastname: Wang
authors.forename: S
authors.initials: S
authors.lastname: Shi
mesh_terms: D000293:Adolescent; D002648:Child; D003731:Dental Caries / Q000209:etiology*; D005260:Female; D006801:Humans; D008297:Male; D009967:Orthodontic Appliances / Q000009:adverse effects*