| Abstrakt: |
Mutans streptococci, in particular Streptococcus mutansand Streptococcus sobrinus, are generally considered to be the principal microbial pathogen of dental caries. The objective of the study was to isolate S. mutansand S. sobrinus, identify them by PCR, and to compare their presence with the caries status and caries risk in Mongolian preschool and school children. Forty one preschool children aged 3–5years and 40 school children aged 12–15years were enrolled in this study. As assessed using Cariostat test, 75.6% of preschool children had high caries risk and 37.5% of school children had high caries risk. In preschool children, the prevalence of S. mutansand S. sobrinuswere 100% and 36.6%, respectively; 63.4% were positive for S. mutansalone and 36.6% were positive for both S. mutansand S. sobrinus. In school children, the prevalence of S. mutansand S. sobrinuswere 100% and 25.0%, respectively; 75.0% carried S. mutansalone and 25.0% had both S. mutansand S. sobrinus. The percentage of children positive for both S. mutansand S. sobrinusin the high caries risk group were significantly higher than those in the low risk group of either preschool (42.0% vs. 10.0%, P<0.001) or school children (46.6% vs. 12.0%, P<0.001). Moreover, the caries status of children positive for both S. mutansand S. sobrinuswere significantly higher than those positive for S. mutansalone (P<0.01 for preschool children, and P<0.05 for school children). |
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