The etiology of osseous deformities of the head, face, jaws and teeth . han the line of articulation ofthe temporary molars, and the pressure of the jaws restsupon the first permanent molars. This fact, together withthe irritation already mentioned, has a tendency to lengthenthe alveolar process, so that when the bicuspids come intoplace there is a difference in the height of the vault. Thereare plenty of illustrations to show this development of the THE HEAD, FACE, JAWS AND TEETH 89 alveolar process, and every practitioner of dentistry hasobserved this. One of the most common illustrations is
The etiology of osseous deformities of the head, face, jaws and teeth . han the line of articulation ofthe temporary molars, and the pressure of the jaws restsupon the first permanent molars. This fact, together withthe irritation already mentioned, has a tendency to lengthenthe alveolar process, so that when the bicuspids come intoplace there is a difference in the height of the vault. Thereare plenty of illustrations to show this development of the THE HEAD, FACE, JAWS AND TEETH 89 alveolar process, and every practitioner of dentistry hasobserved this. One of the most common illustrations is that when themolar teeth upon the lower jaw have been extracted, themolars upon the upper jaw (for want of antagonists) dropdown by the lengthening of the alveolar process. The dif-ference in the height of vault when the temporary teeth arein place and when the permanent teeth erupt is nicely illus-trated in Fig. 17. This cut shows the permanent incisorsand first molars in place. Note the lengthening of thealveolar process. In this manner we obtain the difierence in. Pig. 17. the length of the face. In those cases where the vault isvery high, the alveolar process is always very long and change in the alveolar process is nicely illustrated inNos. 21 and 22, Plate 4, ten years, and in Nos. 32, 33 and35, Plate 6, twelve years. In No. 21, Plate 4, the temporaryteeth have been extracted, and the bicuspids have noterupted, while upon the left side the bicuspid is just comingthrough; on this side the alveolar process is same is true in No. 22, but on the reverse side. This ismore marked in Nos. 32, 33 and 35. The temporary teeth,however, remain in the last three cases. The depth of vaultis also governed by the angle of the jaw. Thus, if from 90 ETIOLOGY OF OSSEOUS DEFORMITIES OF inherited constitutional disease, such as consumption, syphilis,etc., arrest of development of the maxillae should ensue, theangle would not change from an obtuse to a right angle. I
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