1887

Abstract

This study sought to investigate the possible association between the dynamics of oral streptococci community profiles and severe early childhood caries (S-ECC) development, compared with caries-free (CF) controls. Supragingival plaque samples were evaluated from 8–32-month-old children who had previously been assessed for overall profiles of their oral microbial community. Twelve children were in each group. Bacterial genomic DNA was extracted and amplified using -specific primers for streptococci; the products were then subjected to denaturing gradient gel electrophoresis (DGGE) and sequence analysis. We observed that the mean values for species richness () and diversity of oral streptococci (′) were significantly lower in the S-ECC group than in the CF group ( = 1.25 ± 4.14 vs 14.92 ± 2.84; ′ = 1.41 ± 0.29 vs 1.64 ± 0.18) at 32 months of age ( < 0.05). Significantly higher detection rates of and were found in the CF group compared with the S-ECC group at 32 months of age ( < 0.05). Cluster analysis of DGGE profiles showed that most of the clusters were constructed from one individual over time. These results suggested that the onset of S-ECC is accompanied by reduced diversity of oral streptococci, that the detection rates of and have negative correlations with S-ECC; and that there are high levels of intra-individual similarity for the oral streptococci community over time.

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2015-08-01
2022-01-25
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