File:The Dental cosmos (1890) (14778936442).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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wall around the ball e,which in course of time would have completely encapsuled it orbrought it into the solid dentine. In this case, again, the outer por-tion of the track is filled in with cement, the inner portion with moreor less modified dentine. 4. The ball passes through the wall of the tooth and lodges in thesubstance of the pulp. The opening in the wall is closed by a forma- ANATOMY AND PATHOLOGY OF THE TUSKS OF THE ELEPHANT. 515 tion of cement, in which we occasionally find an intermingling ofdentine. The ball becomes encapsuled first by a layer of osteo-den-tine of varying thickness, afterward with regular ivory. Cases ofthis category are illustrated in Figs. 29-31. In Fig. 29 a very smalliron ball breaks through the wall of the tusk at the point a, driving-fragments of the hard tissue into the pulp. Its force being, however,spent in passing through the skin, alveolus, and tooth-wall, it pene-trates but a short distance into the pulp, where, in the course of time, Fig. 29.
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Fig. 29.—Cross-section from a tusk with a small iron ball in situ, a, entrance of ball; p, pulp-chamber. it becomes imbedded in osteo-dentine, with which the track of theball is completely filled up, except at the outermost part, which isfilled out with cement. A careful examination of the preparationshows that the wall, at the time of the wound, could not have beenover one-third of an inch thick. A longitudinal section of a beautiful preparation of this class is illus-trated in Fig. 30. An iron ball breaks through the wall of the toothat a, where it is a little over three-eighths of an inch thick. The exactthickness may be seen at b. Fragments of the broken wall are forced 516 THE DENTAL COSMOS. into the pulp, while the ball penetrates three inches into the pulp be-fore coming to rest, where it becomes surrounded by an irregular, flat-tened mass of osteo-dentine, nearly filling up the whole pulp-chamberat that point. The fragments of the primitive wall become imbedded in osteo-dent

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