File:The Dental cosmos (1891) (14758403426).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:
Fig. CONGENITAL DEFECTS IN ENAMEL. 607 of a deep brown color. These are the protrusions furnishing tothe grinding-surface the appearance of groups of stalactites. Slabsexposed to the action of a half of one per cent, solution of chloride ofgold for one hour exhibit a dark violet color of the dentine in thecrevices between the enamel lumps, which means that a portion of thelime-salts has been dissolved out, although no destruction of theorganic portion of the dentine has taken place. At the usual distancefrom the interzonal layer are seen interglobular spaces. Let us magnify a lump of enamel in this locality five hundreddiameters. (See Fig. 3.) Fig. 2.
Text Appearing After Image:
Section of masticating surface, showing partial covering of enamel. E, well-developedenamel; L, isolated lumps of enamel; D, D, dentine ; /, /, interglobular spaces. X 100. We notice in this specimen narrow prisms, markedly wavy, andinterrupted by faint concentric striations. The prisms, as usual, donot 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,deno

Note About Images