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Updated: May 14, 2025
A striking peculiarity of their dentition, one in which they differ from all other quadrupeds, consists in their having a single large pre-molar, the enamel of which is furrowed with vertical grooves, usually seven in number. Plagiaulex Becklesii, Falconer. Middle Purbeck. Right ramus of lower jaw, magnified two diameters. a. Incisor. b, c. Line of vertical fracture behind the pre-molars. pm.
One day, just after McTeague had put in the temporary gutta-percha fillings and nothing more could be done at that sitting, Trina asked him to examine the rest of her teeth. They were perfect, with one exception a spot of white caries on the lateral surface of an incisor.
The method of the meadow mice is between these two: its stratum of active life is above the mole and beneath the chipmunk. Scores of sharp little incisor teeth are forever busy gnawing and cutting away the tender grass and sprouting weeds in long meandering paths or trails through the meadows.
"Yes, I think I've heard something of the kind before," mumbled Mr. Burton, with difficulty, between the fingers which covered his aching incisor. "Oh h," exclaimed Toddie, "I b'lieve he' goin' to play bear! Come on, Budge, we's got to be dogs." And Toddie buried his face in the bed-covering and succeeded in fastening his teeth in his uncle's calf.
The pain and the shock passed away after a while, but when supper-time came and it was almost always supper-time with the Porcupine his left lower incisor was missing. The right one was uninjured, however, and for a while he got on pretty well, merely having to spend a little more time than usual over his meals. But that was only the beginning of trouble.
This instrument is used by all the Indian tribes on the Upper Amazons. It is generally nine or ten feet long, and is made of two separate lengths of wood, each scooped out so as to form one-half of the tube. To do this with the necessary accuracy requires an enormous amount of patient labour, and considerable mechanical ability, the tools used being simply the incisor teeth of the Paca and Cutia.
The following changes in the shape and appearance of the incisor teeth of the average horse occur in the different years. Unless otherwise mentioned, the statements made regarding the appearance and wear on the table surfaces apply to the lower incisor teeth. SIX YEARS. The table surfaces form the most accurate guide. The cups of the nippers tend to an oval form.
"Let me see your gums. Ah!" he said. There was the stump of one incisor left, and around it the blue line told a tale which ended all doubt. On another occasion, a young physician well known to me, fell by a chance into a consultation with Dr. P., the physician I have mentioned, and the late Professor P. The case was one of a young man who several times had been found at morning in a stupor.
The former are either absolutely useless, such as the mammae of male quadrupeds, or the incisor teeth of ruminants which never cut through the gums; or they are of such slight service to their present possessors, that we can hardly suppose that they were developed under the conditions which now exist.
They appear worn not so much on the outer edge or line of the tooth, as inside this line; but, after this, the edge begins gradually to lose its sharpness, and to present a more flattened surface; while the next outer teeth wear down like the four central ones; and at three months this wearing off is very apparent, till at four months all the incisor teeth appear worn, but the inner ones the most.
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