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Manual of dental surgery and pathology . nary diameters, and filled with partly-nucleated protoplasm ;/andg, confluence of two or more canaliculi ; h, basis substance entirely disappeared, and beyond thisa disintegrated mass composed probably in great part of micrococci. shows, at its neighborhood to the healthy tissue, the canaliculiunaflected; but as the decayed surface is approached, these areenlarged, and tilled apparently with granules and threads, whichreceive the staining of carmine; still nearer to the surface theyare enlarged to two or three times their normal diameters,exhibiting wit

Manual of dental surgery and pathology . nary diameters, and filled with partly-nucleated protoplasm ;/andg, confluence of two or more canaliculi ; h, basis substance entirely disappeared, and beyond thisa disintegrated mass composed probably in great part of micrococci. shows, at its neighborhood to the healthy tissue, the canaliculiunaflected; but as the decayed surface is approached, these areenlarged, and tilled apparently with granules and threads, whichreceive the staining of carmine; still nearer to the surface theyare enlarged to two or three times their normal diameters,exhibiting wit Stock Photo
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The Reading Room / Alamy Stock Photo

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2AWF9TK

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7.1 MB (0.3 MB Compressed download)

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1636 x 1526 px | 27.7 x 25.8 cm | 10.9 x 10.2 inches | 150dpi

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Manual of dental surgery and pathology . nary diameters, and filled with partly-nucleated protoplasm ;/andg, confluence of two or more canaliculi ; h, basis substance entirely disappeared, and beyond thisa disintegrated mass composed probably in great part of micrococci. shows, at its neighborhood to the healthy tissue, the canaliculiunaflected; but as the decayed surface is approached, these areenlarged, and tilled apparently with granules and threads, whichreceive the staining of carmine; still nearer to the surface theyare enlarged to two or three times their normal diameters,exhibiting within them a network of living matter, and occa-sionally, where more enlarged, nuclei also. Further outwards System of Dental Surgery, 2cl edit. p. 29R. * Dr. Frank Abbott, Dental Cosmos, vol. xxi. p. IIG. DENTAL CARIES, 119 they are so extended that several become confluent; as thisincreases, the hasis substance disappears, the outern)ost layerconsisting of a disintegrated mass of tissue mixed up withmicrococci and liptotlirix. Fio;. 91.. Fragment of dentine covered on its surface, and interstices with leptotlirix and micrococci.The drawing must be regarded as diagrammatic rather than accurate. If a portion of carious dentine be tested with litmus-paper,it will be found to possess a strong acid reaction, wliilst in ahealthy tooth the dentine—probably the contents of the cana-liculi—yields a decidedly alkaline reaction. The acid reactionof carious dentine we have accounted for by the neutral phos-phates of lime which are incorporated with the basis substancebecoming converted into the soluble acid phosphate, the hypo-phosphate of lime. To revert to our general observation of the process, wenext, probably, get the eflects of mechanical strain on theenamel, which is imperfectly supported by the subjacent soft-ened dentine, and breaks down, leaving a more or less exposedcavity. Where the disease has been very rapid and interstitial,I, e., occurring between teeth, the breaking of