File:The Dental cosmos (1891) (14781052282).jpg

Identifier: dentalcosmos3318whit (find matches)
Title: The Dental cosmos
Year: 1891 (1890s)
Authors: White, J. D McQuillen, J. H. (John Hugh), 1826-1879 Ziegler, George Jacob, 1821-1895 White, James William, 1826-1891 Kirk, Edward C. (Edward Cameron), 1856-1933 Anthony, L. Pierce (Lovick Pierce), b. 1877
Subjects: Dentistry Dentistry
Publisher: Philadelphia, S. S. White Dental Manufacturing Co
Contributing Library: Yale University, Cushing/Whitney Medical Library
Digitizing Sponsor: The College of Physicians of Philadelphia and the National Endowment for the Humanities

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
onot reach the surface of the enamel, but at a given distance from itthey are replaced by irregular angular pieces. The outermost por-tion of the lump is of a dark brown color. Penetrating the enamelat varying heights are seen numerous pear-shaped prolongations ofthe dentinal canaliculi, some extending nearly to the surface. Thesespaces contain protoplasm, and have become stained a deep violetcolor by the chloride of gold. Aside from these irregularities thelump seems to be thoroughly calcified, except in a few spots upon thesurface, which have taken a slight violet stain. The exposed dentine 6o8 THE DENTAL COSMOS. is also deeply stained the characteristic violet color in this locality,denoting insufficiency of lime-salts, or an excess, over the ordinary,•of organic material. I wish at this point to call attention to a paper just prepared by Dr.John I. Hart, of New York, in which he has shown beyond a possibledoubt, by means of protracted staining with chloride of gold, that Fig. 3.
Text Appearing After Image:
Isolated lump of enamel, very imperfect. P, P, P, protoplasmic projections into the enamelfrom the dentine; C, transverse section of enamel-prisms. X 500. immediately beneath the enamel, in the dentine, there is a very minutereticulum of living matter, considerably more than is found in otherportions of the dentine. This corroborates what Dr. Bodecker statedin 1878, and also more satisfactorily explains the clinical fact that atthis particular portion of a carious cavity in a tooth, the sensibility ismuch more acute than in other parts of the same tooth. In some instances the crown of the tooth may be nearly coveredwith a well-developed or a stratified and slightly pigmented enamel, CONGENITAL DEFECTS IN ENAMEL. 609 the other portions being coated with a thin layer highly pigmented,again denoting deficiency in lime-salts. (See Fig. 4.) We present here a transverse section of the crown of a molar.The thin and irregularly contoured enamel exhibits only transversesections of prisms, of a

Note About Images