General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . Pig. 274.—Abrasion of the incisal edges of two upper central incisors; brownish dis-coloration of exposed dentin. remnant of pulp tissue will be protected by secondary pulp may also become the seat of degenerative changes, thecalcific form being the most frequently encountered. ^.SION AND I ROi [ON 359 Etiology of Erosion It had been assumed that erosion was a purely chemical proc-ess until the Late W. D. Miller, after years of painstaking in-vesti
General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . Pig. 274.—Abrasion of the incisal edges of two upper central incisors; brownish dis-coloration of exposed dentin. remnant of pulp tissue will be protected by secondary pulp may also become the seat of degenerative changes, thecalcific form being the most frequently encountered. ^.SION AND I ROi [ON 359 Etiology of Erosion It had been assumed that erosion was a purely chemical proc-ess until the Late W. D. Miller, after years of painstaking in-vestigations and experiments in the laboratory, was v/iablc toproduce the characteristic erosion facel by the action of acid sub-stances alone. He was able, however, to duplicate in the labo-ratory the typical erosion surface, with its high polish, by a com-. 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
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