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Time- and dose-dependent effects of the Dual Zinc plus Arginine aqueous solution, the Dual Zinc plus Arginine dentifrice, and the regular fluoride dentifrice on the paracellular permeability of gingival keratinocytes to FITC-dextran 4 (FD-4). Results are expressed as the means ± SD of triplicate assays. *, significant decrease (p < 0.05) compared to untreated control cells.
