Caries experience in the primary dentition and presence of plaque in 7-year-old Chinese XXXX : A 4-year time-lag study.

@entity1 @entity1547
OBJECTIVES: The aim of the present study was to test the hypothesis that @entity1547 and @entity1547 experience in primary dentitions has increased over 4 years and to compare the presence of plaque on permanent teeth in @entity1 cohorts over 4 years. MATERIALS AND METHODS: A time-lag study design was used comprising two cohorts of @entity1 aged 7 years from the same five primary schools in Wuhan examined in 2007 and 2011. Two calibrated examiners visually assessed plaque accumulation according to the Greene and Vermillion Index and the dentitions according to the Atraumatic Restorative Treatment (ART) @entity1547 criteria. Analysis of variance (ANOVA), logistic regression, and Chi-square test were used to test for differences between dependent and independent variables. RESULTS: The 2007 sample consisted of 817 @entity1 and the 2011 sample consisted of 1010 @entity1 . The prevalence of @entity1547 (d3mft) was 68.2% in 2007 and 67.7% in 2011, while that of d2mft was 78.5% in 2007 and 71.4% in 2011 (P < 0.0006). The mean d3mft score was 2.8 in 2007 and 3.1 in 2011 (P = 0.046), while the mean d3mfs score was 4.9 in 2007 and 7.3 in 2011 (P < 0.0001). The d3-component of the d3mft index was 73% in 2007 and 69% in 2011, while the f-component was 22% in 2007 and 26% in 2011. The hypothesis was not accepted. The proportion of @entity1 with plaque code 3 (extensive coverage) was higher in 2011 (21.8%) than in age mates in 2007 (5.7%). CONCLUSIONS: There were no obvious signs that @entity1547 had been increased in primary dentitions of this @entity1 population between 2007 and 2011. But as the mean @entity1547 experience scores at the surface level were higher in 2011 than in 2007, monitoring @entity1547 prevalence remains essential, but should start at an earlier age than that covered by this study. Health and educational authorities should collaborate in setting up programs aimed at ensuring good oral health for school @entity1 .
