Effect of Different Acids on Character of Demineralization of Enamel Surfaces

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Abstract
The effect of the addition of certain acid anions to background buffers of acetic - and lactic-acids on the demineralization of intact enamel surfaces (pH 4[center dot]5 and 5.5) was studied. The acid anions were categorized, as "accelerators" (citric-acid and EDTA) or "inhibitors" (aspartic-acid, lysine and tricarballylic-acid) of the decalcifying action of the background buffers. Three patterns of enamel demineralization depended on the type of acid added. Agitation of the acid buffer solutions was more important than all other factors in determining the type of lesion. In agitated systems only erosion-like lesions were produced. With non-agitated systems the chemical composition of the demineralizing media was more important than pH in determining the type of lesion.