The Anatomy, Physiology, and Diseases of the Teeth

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S. Highley, 32, Fleet Street, 1835 - 332 стор.
 

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Сторінка 186 - I have seen instances, where it appeared as if the outer surface of the bony part, which is in contact with the inner surface of the enamel, had first been lost, so that the attraction of cohesion between the two had been destroyed ; and as if the enamel had been separated for want of support, for it terminated all at once.
Сторінка 61 - The rudiments of the permanent teeth are not original and independent like those of the temporary. They are derived from the latter, and continue, for a considerable time, attached to, and intimately connected with, them. At an early period in the formation of the temporary teeth, the investing sac gives off a small process or bud, containing a portion of the essential rudiments, namely, the pulp, covered by its proper membrane. This constitutes the rudiment of the permanent tooth AUKS. It commences...
Сторінка 80 - The first permanent molars usually pierce the gum before the loss of the temporary central incisors, and their appearance may be considered as indicative of the approaching change. The following are about the medium periods at which the different permanent teeth are generally cut, but so irregular are they in this respect that comparatively little dependence can be placed on such a statement. Those of the lower are here indicated, and they most commonly precede the upper by about two or three months...
Сторінка 35 - I think, going too far to say that every fact connected with the human organization goes to prove, that man was originally formed a frugivorous animal, and, therefore, probably tropical, or nearly so, with regard to his geographical situation. This opinion is principally derived from the formation of D his teeth and digestive organs, as well as from the character of his skin, and the general structure of his limbs.
Сторінка 33 - ... class is found to take place, to a much greater degree than in man. Thus, in the carnivora, the cuspidati are greatly elongated and strengthened, in order to enable them to seize their food, and to tear it in pieces; in the rodentia, or gnawing animals, as in the beaver for instance, the incisors are remarkably long, and exhibit that extraordinary development which their peculiar habits demand; and, in the graminivorous animals, the ruminantia especially, the molares are found to occupy the most...
Сторінка 76 - ... permanent cuspidatus is still very deeply imbedded in the bone, with its point rising between the roots of the temporary cuspidatus and the first temporary molaris. The two spreading roots of the latter encompass, as it were, within their span, the first bicuspis, and those of the second temporary molaris, in like manner, the second bicuspis. Nearly a similar arrangement is found to exist in the upper jaw, excepting that the teeth are altogether more crowded.

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