. Oral pathology and practice. A text-book for the use of students in dental colleges and a hand-book for dental practitioners. er-vation enabled him specifically to point out the exact method bywhich caries is produced, which is as follows: 92 ORAL PATHOLOGY AND PRACTICE. In the sulcus of a tooth, or between two teeth, or in any pitor irregularity of its surface, food lodges. By the action of someferment this is perhaps changed into a fermentable sugar. Thisforms a suitable medium for some of the bacteria, and it is perhapsat once infected with certain acid-producing fungi, which in theirgrow
. Oral pathology and practice. A text-book for the use of students in dental colleges and a hand-book for dental practitioners. er-vation enabled him specifically to point out the exact method bywhich caries is produced, which is as follows: 92 ORAL PATHOLOGY AND PRACTICE. In the sulcus of a tooth, or between two teeth, or in any pitor irregularity of its surface, food lodges. By the action of someferment this is perhaps changed into a fermentable sugar. Thisforms a suitable medium for some of the bacteria, and it is perhapsat once infected with certain acid-producing fungi, which in theirgrowth split up the fermentable sugar, building into their own sub-stance such elements as are necessary, and leaving the remainder toform new combinations, or by-products, one of which may be lacticacid. This acid, especially active in its nascent or formative condi-tion, attacks the teeth, dissolving out the calcic salts, and forming adepression in which more food lodges, to pass through the samechanges and to be in turn decomposed by new colonies of bacteria,thus forming more acid to continue the destructive work. Fig. Dental Caries. Cross-section showing Melting Down of the IntertubularSubstance and the Formation of Minute Cavities through the Action of Micro-organisms. (Mummery.) The dissolving out of the calcareous parts of the toothleaves behind the organic or living portion, which may passthrough inflammatory or degenerative stages, finally to be de-stroyed by putrefactive organisms. This is the essential principleof Millers discovery. The enamel once penetrated by the pro-ducts of the growth of the vegetable fungus, the progress of thedisorganization is more rapid. The bacteria penetrate the dentinal tubuli (see Figs. 18 and19); the acid generated within them, through the action of the DENTAL CARIES. 93 micro-organisms, enlarges the tubules (see Figs. 20 and 21), melt-ing down two or more into one, thus forming minute chambers orcavities in the dentine (see Fig. 22),
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