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Results of the MTT metabolic activity assay for S. mutans on composite disks at: (A) 1 d, and (B) 3 d. A higher absorbance indicates an overall higher metabolically active biofilm on the composite disk that metabolized the MTT tetrazole. In each plot, values (mean ± sd; n = 6) with dissimilar letters are significantly different from each other (p < 0.05). Values with the same letters are not significantly different (p > 0.1).
