General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . eria which have the power of dissolving (peptonizing) the or-ganic matrix of the dentin. As the enamel is penetrated and thedecalcifying agent reaches the dentoenamel junction the processspreads laterally with a rapidity proportionate to the prominence 326 DENTAL PATHOLOGY of the granular layer. The more marked the latter; , the greaterthe size of the expansions into which the tubules open, the morerapid and greater will be the lateral involvement at the dento
General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . eria which have the power of dissolving (peptonizing) the or-ganic matrix of the dentin. As the enamel is penetrated and thedecalcifying agent reaches the dentoenamel junction the processspreads laterally with a rapidity proportionate to the prominence 326 DENTAL PATHOLOGY of the granular layer. The more marked the latter; , the greaterthe size of the expansions into which the tubules open, the morerapid and greater will be the lateral involvement at the dento-enamel junction. The area of involvement at the dentoenamel junction, becauseof the facility with which bacteria will travel along this line, isgreater than the area of involvement in the dentin toward thepulp. It is for this reason that the carious process in the dentinassumes a conical shape or, as expressed by Black, the tendency isto the formation of a conical area of decay with the point of thecone toward the pulp of the tooth and its base at the dentoenameljunction (Fig. 238). In the presence of wide tubular expansions. Fig. 238.—Typical conical form of penetration of caries into the dentin; the base ofthe cone is at the dentoenamel junction while the apex of the cone is toward the pulp.((.. V. Black.) at the dentoenamel junction—the granular layer—the amount ofcalcified matter to be acted upon by lactic acid will be proportion-ately decreased, so that caries will advance rapidly and a greaterarea of underlying dentin will become involved. Caries in a fis-sure, after the dentoenamel junction has been reached, and whenan excessive granular layer is present, will advance more quicklylaterally than in depth into the dentin, and this lateral caries willthen advance toward the enamel undermining the enamel cap overa considerable area. The calcium salts of the dentin are dissolved by the lactic acidand the remaining tough, cartilaginous matrix is then acted uponby pepton
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpathology, bookyear19
