Abstract
Increases of calcium, phosphate and hydroxyl ion concentrations, and addition of 1 ppm fluoride to remineralizing solutions increased the rate of enamel remineralization. Fluoride ions lowered the solution concentrations of calcium, phosphate and hydroxyl ions required for demineralization-remineralization equilibrium. The ionic strength of the remineralizing solutions (0.075 to 0.225 M NaCl) was without effect on enamel remineralization, but prevented spontaneous precipitation of the mineralizing solutions. Remineralized enamel was as resistant to dissolution by weak acids as natural mineralized enamel, and enamel remineralized in solutions containing 1 ppm fluoride was more resistant than naturally mineralized enamel.
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