File:Dental cosmos (1893) (14799065283).jpg

Identifier: dentalcosmos3518whit (find matches)
Title: Dental cosmos
Year: 1893 (1890s)
Authors: White, J. D McQuillen, J. H. (John Hugh), 1826-1879 Ziegler, George Jacob, b. 1821 White, James William, 1826-1891 Kirk, Edward C. (Edward Cameron), 1856-1933 Anthony, Lovick Pierce, 1877-
Subjects: Dentistry
Publisher: Philadelphia : S. S. White Dental Manufacturing Co
Contributing Library: The College of Physicians of Philadelphia Historical Medical Library
Digitizing Sponsor: The College of Physicians of Philadelphia and the National Endowment for the Humanities

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Fig. -.—Young cat. End of root ofincisor with Hertwigs epithelial sheath. E.Sch, sectionafter Mahrenthals method 1 pyroligneous acid ; ; P, cells of the pulp ; Od, odontoblasts ; Dituncalcified dentine; SEi, inner, SEa, outer enamel epithelium; C, formative cells of thecement. Zeiss Apochrom. 2.0 comp. oc. 4. 625 diam. Drawn from a microphoto. ing cells into the columnar dentine-forming cells can be directly tracedin reptiles with acrodont teeth, — e.g., in Chamaeleon. In a similarmanner can be demonstrated, during the development of the teeth n9s THE DENTAL COSMOS. of Mammalia, the transition of embryonic spherical cells into highcolumnar cells (Fig-. 7). The more the deposition of the dentine advances, the narrowerin consequence becomes the pulp space. If throughout life the samemass of odontoblasts has to form the dentine, these cells must be- Fig. 8.
Text Appearing After Image:
Fig. 8.—Young cat. Top of an incisor. Section after Mahrenthals method fpyroligneousacid), .^undeveloped enamel; Z), dentine ; Od, odontoblasts; P, cells of the pulp; C, bloodcapillaries. Zeiss Apochrom. 2.0 comp. oc. 4. 625 diam. Drawn from a microphoto. come thinner by degrees. This indeed is the case. Young odonto-blasts from the region where the formation of dentine has justbegun are short and thick, and have usually several dentine processes.Older odontoblasts are long and thin, and have one dentine processonly (Figs. 7 and 8). Somet imes it may be observed that in prepa-rations the odontoblasts do not lie close together, but have narrow HISTOGENY AND HISTOLOGY OF BONY AND DENTAL TISSUES. II99 spaces between them (Fig. 8). These latter no doubt arise by aslight shrinking of the cells rich in water, when they are fixed withosmic acid. But such preparations prove that there is no firm con-nection between the various odontoblasts, as is the case with epithelialcells. It is well kn

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