File:The Dental cosmos (1890) (14592580960).jpg

Identifier: dentalcosmos3218whit (find matches)
Title: The Dental cosmos
Year: 1890 (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

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by the opposite wall. In thecourse of time the whole pulp-chamber at this part of the tusk becamefilled up with ivory, which will be seen to have a very irregular struc-ture, owing to the serious disturbance produced by the passage andpresence of the iron ball. A case is now and then to be met with in which the encapsuled ballis united to the wall of the pulp-chamber by a narrow neck of ivory.By some the ivory is supposed simply to grow from the wall aroundthe ball, thereby inclosing it ; others suppose that the ball first be-comes encapsuled and afterward unites with the tooth-wall, a pointwhich might be determined by proper sections under the microscope.To me the former explanation seems the more probable. In Fig. 28 520 THE DENTAL COSMOS. a wall is in process of formation around the ball c. The mass in-closing the ball may grow to the size of a hens egg or larger, andsometimes sends out numbers of stalactitic processes in a directionparallel with the long axis of the tusk. Fig. 35.
Text Appearing After Image:
Fig. 35.—Cross-section from the alveolar portion of a tusk pierced by an iron ball, showingthe wall of normal ivory formed previous to and the pathological ivory formed subsequent tothe wound. 6. The ball passes completely through the base of the tooth and es-capes at the opposite side. I possess but two cases of this kind, shownin Figs. 35 and 36. In the first of these (Fig. 35) the ball entered the ANATOMY AND PATHOLOGY OF THE TUSKS OF THE ELEPHANT. 521 tusk at the right side and passed out on the left. There is no diffi-culty in determining the exact thickness of the wall of the tusk at thetime,—at the thickest point a fraction over one-half inch. Fig. 36.

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