General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . y if v ^ . Fig. 239.—Microorganisms in the structure of the dentin. (Miller.). Fig. 240.—Microorganisms in the structure of the dentin. (Miller.) 328 DENTAL PATHOLOGY dentinal tubules as soon as access to them is secured by the dis-solution of the overlying enamel (Figs. 239-242). Here they canbe seen in considerable numbers and occasionally the tubules ap-pear distended, evidently as the result of the action of the or-ganisms upon the decalcified or quasidecalcif
General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . y if v ^ . Fig. 239.—Microorganisms in the structure of the dentin. (Miller.). Fig. 240.—Microorganisms in the structure of the dentin. (Miller.) 328 DENTAL PATHOLOGY dentinal tubules as soon as access to them is secured by the dis-solution of the overlying enamel (Figs. 239-242). Here they canbe seen in considerable numbers and occasionally the tubules ap-pear distended, evidently as the result of the action of the or-ganisms upon the decalcified or quasidecalcified structure of thetubules. Black was of the opinion that microorganisms do notpenetrate into the dentinal tubules until the calcium salts havebeen dissolved for a short distance in advance of the bacteria. If, now, decalcification should proceed in an external directionfrom the dentoenamel junction, and coincidentally in an internaldirection into the dentin, a cavity of considerable size will beformed having a very small opening externally. The lateral prog-ress of caries at the dentoenamel junction is designated aslateral caries, and the progress of caries from the lateral involve-ment back into th
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