The etiology of osseous deformities of the head, face, jaws and teeth . Fig. Fig, 201. pids may arise from constitutional causes, i. e., from a lackof accord between the size of the jaw and that of the teeth, orfrom local causes. The latter are frequent and come underthe following heads: (1) Tardy eruption; (2) deflection due tothe retention of temporary roots; (3) forward movement ofthe molars and (4) rotation from want of occlusion. THE HEAD, FACE, JAWS AND TEETH 447 1. Tardy eruption.—The natural order of eruption is: firstbicuspid; second bicuspid; cuspid. But this is disturbedoccasi
The etiology of osseous deformities of the head, face, jaws and teeth . Fig. Fig, 201. pids may arise from constitutional causes, i. e., from a lackof accord between the size of the jaw and that of the teeth, orfrom local causes. The latter are frequent and come underthe following heads: (1) Tardy eruption; (2) deflection due tothe retention of temporary roots; (3) forward movement ofthe molars and (4) rotation from want of occlusion. THE HEAD, FACE, JAWS AND TEETH 447 1. Tardy eruption.—The natural order of eruption is: firstbicuspid; second bicuspid; cuspid. But this is disturbedoccasionally, so that the first bicuspid is followed by the cus-pid, thus pushing it backward. When there is a lack of spacethe second bicuspid must seek its way between the first bicus-pid and the first permanent molar, and if there is a lack ofroom it is crowded outside or within the arch. (Fig. 200.) 2. Deflection.—When a temporary molar is retained toolong, or its root is not absorbed as fast as the bicuspid iserupted, this obstacle may deflect the bicuspid or cause it torota
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjecthead, bookyear1894
