General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . Fig. 275.—Photomicrograph of ground section of one of the abraded teeth shown inFig. 274. a, enamel; b, dentin; c, abraded enamel with a chip broken off in mounting, onright side of picture; d, abraded and discolored dentin. bination of acid and mechanical action (Fig. 290). He thereforereached the conclusion that at least the experimental form oferosion was not entirely the result of chemical action. Any acidwhich is capable of abstracting calcium salts from the
General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . Fig. 275.—Photomicrograph of ground section of one of the abraded teeth shown inFig. 274. a, enamel; b, dentin; c, abraded enamel with a chip broken off in mounting, onright side of picture; d, abraded and discolored dentin. bination of acid and mechanical action (Fig. 290). He thereforereached the conclusion that at least the experimental form oferosion was not entirely the result of chemical action. Any acidwhich is capable of abstracting calcium salts from the enamel anddentin, or of dissolving the interprismatic substance, may be con-cerned in erosion; any acid or acid substance which is sufficientlypowerful to disintegrate the organic basic substance of the dentin 360 DKXTAL PATHOLOGY may cause wasting (erosion) with a minimum of In a case of extensive erosion studied by Kirk2 lactic acid ap-peared to be the cause of the wearing away of the surfaces ofthe teeth; and in other cases studied by him he has attributed. Fig. 276.—Upper rightcuspid. Practically the en-tire crown has wasted awayon account of abrasion. Fig. 277.—Upper cuspids which for many years hadbeen the seat of abrasion. The entire crown in eachcase wasted away without exposing the pulp. the cause to the action of acid sodium phosphate and acid calciumphosphate, which are secreted by the gingival glands as themanifestation of a nutritional disorder. This nutritional dis- Miller, W. D.: Experiments and Observations on the Wasting of Food Tissue, DentalCosmos, xlix, No. 2. Kirk, E). C: Items of Interest, xxiv, No. 7, July, 1902, p. 511. ABRASION \\1> EROSION 36] order is responsible for the presence in the blood of an excess ofcarbon dioxide which changes the basic sodium and calciumphosphates into their respective acid --alts.
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