Investigation of status of dental caries in children of primary school in Hangzhou city from 2009 to 2011

PURPOSE: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.