Dental cosmos . , and it requires nothing further toemphasize the perfect symmetry and the coordination of forces pre-sented by the human skull, and the frame of the masticatory appa-ratus in particular. Arrangement of the jaw forms an arch of sixteen teeth. The two articulating arches run in line with the alveolar ridges of thejaws, and are in harmonious relation to the skeleton (or the face . The arches correspond very closely to each other in curvature,length (mesio-distal), width (bucco-lingual), and occluding surfaces MASTICATION IN MAN. or functional arrangement, so that in o
Dental cosmos . , and it requires nothing further toemphasize the perfect symmetry and the coordination of forces pre-sented by the human skull, and the frame of the masticatory appa-ratus in particular. Arrangement of the jaw forms an arch of sixteen teeth. The two articulating arches run in line with the alveolar ridges of thejaws, and are in harmonious relation to the skeleton (or the face . The arches correspond very closely to each other in curvature,length (mesio-distal), width (bucco-lingual), and occluding surfaces MASTICATION IN MAN. or functional arrangement, so that in occlusion there is contact allaround the arch. Normal dentures have a true occlusion. 4 In straight occlusion both sides of the arches meet simultaneously, nonebefore the other.—Dr. Haskell. The two halves of each arch are symmetrical in all particulars, andmeet in the median line of the face. Outline of the shape of the alveolar arch presents varieties in the different tempera-ments. Fig. 2. Fig. The arch of the bilious temperament (Fig. 2) is almost flat from cuspid tocuspid, the lines backward from these points slightly diverging in an almoststraight line. The sanguine arch (Fig 3) resembles a horseshoe in shape. The arch of the nervous temperament (Fig. 4) presents a strong pointedor Gothic character ; from the centrals backward (which often overlap for wantof space) the line of the teeth continues backward with a slight curve, thegreatest prominence being between the cuspid and first bicuspid. The lymphatic arch (Fig. 5) is almost semicircular in its outline.—Dr. Ivy.* *Figs. 2, 3, 4, and 5 are reproduced from the American System of Den-tistry, by permission of the publishers, Messrs. Lea Brothers & Co., Phila-delphia. 262 THE DENTAL COSMOS. 4 The uoper arch forms the half of an ellipse, the lower arch a parabola. —Dr. E. Milhlreiter. 44 The upper teeth are arranged in the form of a semi-ellipse, the long axispassing between the central incisors. Freque
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