File:Dental cosmos (1889) (14781521692).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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The first molar occupied a corre-sponding position to the second bicuspid, and the second molar inturn the same thing toward the first; the meshing of the cuspsbetween the upper and lower teeth was good; mastication andtrituration could be performed on both sides of the mouth. Now at twenty what do we see ? The lower incisors lean consider-ably forward ; more than is normal. The lower cuspids are no longer CHANGES DURING DEVELOPMENT OF THE HUMAN TEETH. 593 upright; the first bicuspid leans so far forward that the tuberosityof the second is quite below the tuberosity of the first, and almostthe same condition exists between the molar and the second bicuspid.The lower arch (Fig. 19 A) is distinctly narrowed ; and yet it willbe remembered that nothing has been extracted from the lowerjaw, nor has any tooth been filed. The movement that we see isentirely due to the change in occlusion, which has taken place sinceremoving the natural support from in front of the second upper bi- Fig. 19 A.
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cuspids. We cannot see that the six upper front teeth have gonebackward, although I tried my best to make them do so, but we dosee that the back upper teeth have come forward, and in their com-ing forward the change in the lines of occlusion has been such thatthey have driven the lower teethforward also, and in that forwardmovement has occurred a distinct shortening of the bite to theextent here seen. 594 THE DENTAL COSMOS. Dr. Davenport claims that the bite will be shortened it* the firstmolars are lost before eruption of the bicuspids. I think it generallywill, but the models here exhibited show clearly that if in any givencase like those of Dr. Howes presented before us last year the biteis lengthened, it is only because of a continuation of the develop-ment in the jaw and alveolus, and the advance of the wisdom-teethso high on the curve of the lower jaw as still to assist somewhat inthe developmental process; but had the first molar teeth in thesecases not been lost, the developme

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