title: Caries increment over 2 years in preschool children: a life course approach.
abstract: BACKGROUND
  Longitudinal study to investigate how the dental caries in primary teeth progress with increasing age is still lacking. Aims.  To describe the development of new caries over 2years and to identify risk factors that can predict new caries development.
  
  
  METHODS
  A random sample of preschool children aged 3-4years was surveyed and followed up when they reached 5-6years of age in Hong Kong. Dental caries status was assessed using the dmft index. Negative binomial regression was performed to investigate the factors collected at baseline that could predict the caries increment over 2years.
  
  
  RESULTS
  Totally 358 children attended both examinations. The mean caries increment over 2years was 0.9. Results of the negative binomial regression showed that children who used nursing bottles during sleep when they were young (P=0.013), whose toothbrushing began after 12months (P=0.005), who took snack once or more daily (P<0.001), and whose parents had 9 or fewer years of education attainment (P=0.002) had significantly higher caries increment.
  
  
  CONCLUSIONS
  New caries development of Hong Kong preschool children was low. Children's feeding, snaking and brushing habits, and parents' education attainment were the significant predictors for new caries development of preschool children.
authors.affiliation: Dental Public Health Faculty of Dentistry, University of Hong Kong, Hong Kong, China. mcmwong@hkucc.hku.hk
authors.forename: M C M
authors.initials: MC
authors.lastname: Wong
authors.forename: H X
authors.initials: HX
authors.lastname: Lu
authors.forename: E C M
authors.initials: EC
authors.lastname: Lo
mesh_terms: D002648:Child; D002675:Child, Preschool; D004245:DMF Index; D003731:Dental Caries / Q000453:epidemiology* / Q000473:pathology / Q000517:prevention & control; D003733:Dental Caries Susceptibility; D005247:Feeding Behavior; D005260:Female; D006723:Hong Kong; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D009909:Oral Health / Q000706:statistics & numerical data; D009910:Oral Hygiene / Q000706:statistics & numerical data*; D011446:Prospective Studies; D012959:Socioeconomic Factors; D014094:Tooth, Deciduous / Q000473:pathology*; D014099:Toothbrushing / Q000706:statistics & numerical data