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The antimicrobial activity of coated SNP against S. mutans in micrograms per milliliter (µg/mL). (a) SNP size; (b) coating type; (c) S. mutans serotypes; and (d) microdilution plaque (purple coloration shows stained bacteria). Values shown are the mean ± standard deviation. Clinical strains, 34 in number, (c = 20; e = 6; f = 1 and k = 7) were assayed. Asterisks indicate significant differences (p < 0.05).
