The Dental cosmos . m the alveolar border. Microscopically, the cement of the elephants tusk is similar to thatof the human tooth. It possesses a distinctly lamellated structure, andis, as far as I have been taught by an examination of twelve differentspecimens, under perfectly normal conditions, without blood-vessels. The cement-lacunae are exceedingly numerous, and are oftenarranged in rows parallel with the laminae (Fig. 10). They possess alarge number of minute, finely-branched processes (Fig. n). The residual or penetrating fibers of Sharpey are remarkable fortheir number, length, and reg
The Dental cosmos . m the alveolar border. Microscopically, the cement of the elephants tusk is similar to thatof the human tooth. It possesses a distinctly lamellated structure, andis, as far as I have been taught by an examination of twelve differentspecimens, under perfectly normal conditions, without blood-vessels. The cement-lacunae are exceedingly numerous, and are oftenarranged in rows parallel with the laminae (Fig. 10). They possess alarge number of minute, finely-branched processes (Fig. n). The residual or penetrating fibers of Sharpey are remarkable fortheir number, length, and regularity. In many cases, also, thesefibers, or cement canaliculi, as they may be more properly termed,present regular secondary curvatures, giving the cement an appear-ance very much like that of ivory (Fig. 12). vol. xxxii.—31 421 422 THE DENTAL COSMOS. B. Denti?iey or Ivory. Ivory, as also tubular dentine in general, consists of an organicbasis-substance, permeated with lime-salts and penetrated by fine, Fig. f Fig. io.—Cross-section of cement, showing the arrangement of the lacunae in parallel ,stratum granulosum ; b, strata interlameilaria of the dentine. 56: 1. branching sheathed tubules, which pass from the center of the tooth orfrom the pulp-chamber to the periphery. It is organically connectedw th the cement through the medium of the stratum granulosum. Fig. 11.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectdentist, bookyear1890
