Solubility of Enamel as Affected by Fluorides of Varying pH

Abstract

It has been well established that fluorine reduces enamel solubility and thus inhibits dental caries. However, the mechanism by which it acts is not known nor are other variables involved in its use. One of these is the most effective pH for the fluorine soln. when employed for topical application. Studies made on both powdered enamel and whole tooth sections showed that the most effective pH was 2.6. Samples were treated with NaF solns. which varied in pH from 2.6-7.5 and were subsequently immersed in a decalcifying soln. The greatest inhibiting action occurred at pH 2.6. Tests also indicated that a soln. of this low a pH was not injurious to the enamel in the period of time normally used in topical application.