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Evaluation of Streptococcus mutans serotypes e, f , and k in saliva samples of 6-12-year-old school children before and after a short-term daily intake of the probiotic lozenge.

Aim: The aim of this study is to assess the variations in the levels of Streptococcus mutans in saliva before and after short-term daily intake of the probiotic lozenge. To estimate the prevalence of S. mutans serotypes e, f, and k and its variations in salivary levels before and after short-term daily intake of the probiotic lozenge.

Materials and Methods: This double-blind randomized controlled trial was conducted among 60 children of 6-12 years old, who were given lozenge twice daily containing probiotic bacteria twice daily, one in the morning and another in the evening after brushing for 1 month. The placebo lozenge group also followed the same protocol. A pre- and post-quantitative analysis of S. mutans and serotypes e, f, and k level were done in the saliva of both experiment and control groups.

Statistical Analysis: The data thus collected were statistically evaluated using repeated measures of ANOVA, followed by post hoc test and independent t-test.

Results and Conclusion: When compared with baseline, a significant reduction of S. mutans was seen after 1 month intervention and 6 months follow-up. The prevalence of serotype e was found to be 5% and serotype k was found to be 12%, whereas none of the samples carried serotype f. Future long-term research with a larger sample size is required to determine the prevalence of S. mutans serotype and longer evaluation period is required to assess the preventive role against caries development.

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