title: [Investigation of status of dental caries in children of primary school in Hangzhou city from 2009 to 2011].
abstract: OBJECTIVE
  To investigate the status of dental caries in children of primary school in Hangzhou City from 2009 to 2011.
  
  
  METHODS
  The status of dental caries was examined annually from 2009 to 2011, and the caries prevalence, filling rates, mean DMFT/dmft were recorded. SPSS 13.0 software package was used for statistical analysis.
  
  
  RESULTS
  From 2009 to 2011, the caries prevalence of deciduous teeth were 49.27%, 48.09% and 48.33%, mean dmft were 2.78, 2.81 and 2.84, filling rates of deciduous teeth were 3.92%, 4.31% and 4.28%, respectively. No significant difference was found in the caries prevalence of temporary teeth, filling rates of temporary teeth, mean dmft. For the permanent teeth, the caries prevalence were 20.24%, 18.48% and 15.85%, mean DMFT were 0.46, 0.41 and 0.33, filling rates were 10.17%, 15.67% and 23.00%, respectively. From 2009 to 2011, the caries prevalence and mean DMFT of permanent teeth was decreased, while the filling rate was increased.
  
  
  CONCLUSIONS
  In the past three years, the status of dental caries of permanent teeth shows a remarkable improving tendency in children of primary school in Hangzhou City. However, the status of dental caries of deciduous teeth presents no significant improvement.
authors.affiliation: Department of VIP, West of Hangzhou Stomatological Hospital, Hangzhou, Zhengjiang Province, China.
authors.forename: Qi-yong
authors.initials: QY
authors.lastname: Hu
authors.forename: Min
authors.initials: M
authors.lastname: Liu
authors.forename: Ren-fei
authors.initials: RF
authors.lastname: Wang
authors.forename: Xiao-feng
authors.initials: XF
authors.lastname: Li
authors.forename: Chang
authors.initials: C
authors.lastname: Jing
authors.forename: Xiao-hua
authors.initials: XH
authors.lastname: Tian
mesh_terms: D002648:Child; D002681:China / Q000453:epidemiology; D004245:DMF Index; D003731:Dental Caries / Q000453:epidemiology*; D006801:Humans; D015995:Prevalence; D012574:Schools; D014094:Tooth, Deciduous