File:Dental cosmos (1889) (14595385157).jpg

Identifier: dentalcosmos3118whit (find matches)
Title: Dental cosmos
Year: 1889 (1880s)
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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tratum intermediumas it becomes itself used up by advancing calcification, convertingit into enamel-fibers. These authors give credit to Kollikeras the originator of the ideathat the enamel-cells do not undergo direct conversion into enamel-fibers, but that the enamel is, as it were, shot out from their ends ;that is, it is a secretion from them, not a deposition of lime-salts intotheir own substance. Our quotations from Kollikers original Ger-man work, issued in Leipzig in 1852, plainly show that he at thattime believed fully in the conversion theory. Since the Tomesesquote from the fifth German edition of Kollikers histology, issuedin 1867, it is obvious that he has changed his views, much, in myjudgment, to his own disadvantage. GROWTH OF ENAMEL. 753 The latest publication upon the history of development of theenamel is that by C. Heitzmann and C. F. W. Bodecker,— Con-tributions to the History of Development of the Teeth (IndependentPractitioner, vols, viii, ix, 1887-88). Fig. 1.
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Tooth of human foetus, six months.—P, papilla. D1, non-calcified dentine. D2, calcified dentine. E,enamel. A, row of ameloblasts. M, medullary corpuscles at the peripheral portion of ameloblasts.G, globular corpuscles from which ameloblasts develcp. EE, buds-of external epithelium. F, follic le,made up of fibrous connective titsce. X 100. This work is in harmony with my own observations, and furnishesthe foundation of what I have to ad.d, in the way of a more compre-hensive idea, in the building process of enamel, than has heretofore 754 THE DENTAL COSMOS. been advanced. This I propose to give in as few words as I con-veniently can and make myself clearly understood. Fig. 1 gives an illustration of these views. The figure, it mu-tbe emphasized, is not diagrammatic, but copied with the utmost carefrom one of Bodeckers specimens of a human foetus six monthsold, the period at which enamel begins to appear. The differentlayers, it will be observed, appear separated from one another. Thi

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