Dental cosmos . he right and left dental arches, Fig. 9, which,resembles the right superior dental arch, Fig. 2. ETIOLOGY OF IRREGULARITIES OF THE JAWS AND TEETH. 11 The manner of the formation of the typical V- and semi V-shapedjaws and alveolar process has now been demonstrated. Kindredirregularities of the teeth and their relations to each other dependentirely upon the shapes of the crowns, the points of approximalantagonism, the undeveloped jaws, and the direction of the disturb-ing forces. No two cases of irregularities are exactly alike, all beingmodified by local influences. This explai
Dental cosmos . he right and left dental arches, Fig. 9, which,resembles the right superior dental arch, Fig. 2. ETIOLOGY OF IRREGULARITIES OF THE JAWS AND TEETH. 11 The manner of the formation of the typical V- and semi V-shapedjaws and alveolar process has now been demonstrated. Kindredirregularities of the teeth and their relations to each other dependentirely upon the shapes of the crowns, the points of approximalantagonism, the undeveloped jaws, and the direction of the disturb-ing forces. No two cases of irregularities are exactly alike, all beingmodified by local influences. This explains a remark which I havemade before, viz: that irregularities of the teeth are not and arrested development of the jaws may be trans-mitted, but the teeth are creatures of circumstances. They developand move into position independently. They are crowded by theforward pressure of the molar teeth, modified by asymmetry of themaxillary bones and the inward pressure of the cuspids. These Fro. forces account for the location of irregularities in the anterior partof the mouth. The following are illustrations of a few of mymodels showing the peculiarities of arrangement of the teeth in V-and semi V-shaped arches. Fig. 10 shows a very common form of irregularity of the centralincisors. In the development of the central and lateral incisors, themesial points of the laterals passed posterior to the distal points ofthe centrals. The anterior movement of the teeth posterior to thelaterals was so great as to not only rotate the centrals, but alsocarry the alveolar process slightly forward. Under such circum-stances the forward movement of the right and left dental archesdoes not cease until the mesial surfaces of the crowns come in contactwith the centrals throughout and the lateral pressure is equalizedagainst the anterior bases—the central incisors. Fig. 11 illustrates a singular irregularity in the right superiordental arch. A supernumerary tooth is located in
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Keywords: ., bookauthor, bookcentury1800, bookdecade1880, booksubjectdentistry
