ABSTRACT
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.
Subject(s)
DMF Index , Dental Caries/epidemiology , Child , China/epidemiology , Humans , Prevalence , Schools , Tooth, DeciduousABSTRACT
OBJECTIVE: To investigate the effects of Drynaria fortunei J. Smith naringin (DFSN) on proliferation and differentiation of human periodontal ligament cells (hPDLC). METHODS: Cultured human periodontal ligament cells were treated with DFSN at different concentrations. Cell proliferation was determined by MTT method; cell differentiation was evaluated through the examination of alkaline phosphate (ALP) activities. RESULTS: DFSN in a concentration ranged from 0.01 mu mol/L to 10 mu mol/L showed a promoting effect on proliferation of hPDLC (P< 0.05), and it also promoted ALP activities of hPDLC (P<0.05). CONCLUSION: Drynaria fortunei J. Smith naringin can promotes the proliferation and differentiation of human periodontal ligament cells.
