: Streptococcus mutans is a gram-positive bacterium in oral cavity which metabolism produces acid as the common cause of dental caries (tooth decay
Result of the research indicates that Minimum Inhibitory Concentration (MIC) is found at concentration 10% of the white pepper extract, where as the Minimum Bactericidal Concentration (MBC) is found at concentration 12,5% of the extract. Data analysis is conducted with non parametric test of Kruskal Wallis. Kruskal Wallis test shows at least there is a difference of the number of colonies as the given concentration (p < 0,05). The correlation test of Spearman reveals a very strong reciprocal correlation between concentration of white pepper extract and the number of Streptococcus mutans colonies growth (Correlation,986; p < 0,05
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