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J Dent Res 49(1): 42-46, 1970
© 1970 International and American Associations for Dental Research
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Acid-Reacting Stains, Softening, and Bacterial Invasion in Human Carious Dentin

MILTON R. WIRTHLIN JR. 1

1 US Naval Dental School, Bethesda, Maryland 20014

This study investigated the relationships of acid-reaction, softening, and bacterial invasion in carious dentin. Softened carious dentin took up methyl red but not lackmoid. The use of methyl red as pH indicator to show acid-reaction in dentin was questioned. Destructive changes before softening were demonstrated with ninhydrin; these changes preceded bacterial invasion.

Submitted on June 17, 1968






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