The effect of sodium fluoride in acid etching solution on sealant bond and fluoride uptake

Effects of etching with 30% of H3PO4 containing NaF on the enamel surface were re-examined. Results indicated that 2.5% NaF in the etchant prevent the sealant bond, but addition of 0.02% NaF resulted in an increase in fluoride content of the enamel surface without a decrease in bond strength.