File:The Dental cosmos (1891) (14780868582).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

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f abad-tempered elephant came upon the pulp. Finally, in rare cases,the pulp has been exposed by gunshot wounds. The extent of theexposure will of course be determined by the point at which the frac-ture takes place, and varies from a mere point, when the tusk isbroken near the apex, to an opening two to four inches in diameter,where the fracture takes place at the alveolar border. When in the human mouth a total exposure of the crown of thepulp is brought about either by caries or attempted extraction, one ofthree results may be expected : (i) the pulp may and usually doesvol. xxxiii.—13 169 i7o THE DENTAL COSMOS. undergo a process of inflammation resulting eventually in partial ortotal necrosis, although it sometimes remains indefinitely in a state ofchronic inflammation, without any apparent loss of substance ; (2) itmay, especially in the case of molars, become the seat of a new forma-tion, giving rise to the so-called polyp of the pulp ; (3) it may becomecalcified. Fig. 47. €
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a l A longitudinal section through a short cut from the end of a tusk which was broken off atd, c. d, a, b, c, the pulp-chamber at the time of the accident, is now, with the exception of thecavity d, e, c, filled out with a conglomerate of dentinal and osseous tissues. The end of thetusk has been slightly rounded off by wear. Natural size. The last event, so seldom observed in human teeth, is the usualresult of fracture in the tusk of the elephant ; whereas the result men-tioned under 1 comparatively seldom occurs, and a polyp of the pulp,in the sense used in relation to the human teeth, would naturally beimpossible in consequence of the rough usage to which the tusk issubjected. In Fig. 47 I have represented a longitudinal section through the ANATOMY AND PATHOLOGY OF THE TUSKS OF THE ELEPHANT. 171 end of a tusk broken off at d, c, where the pulp at the time of theaccident had a diameter, c, d, of a little more* than five centimeters(about two inchest It will be seen that a comparativ

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