Dental cosmos . pids have moved forward,and have not only filled the space, but have carried the alveolar pro-cess with them, giving the jaw a lengthened appearance. Had thelaterals been in place, their mesial surfaces would have touched thedistal edges of the centrals in such a manner as to have rotated thecentrals into the V-shaped form. The antagonism of the surface ofthe cuspids and the uniform pressure of the posterior columns ineach lateral dental arch have caused the forward movement of thecentrals without rotation. The absence, of the lateral incisors andthe forward movement of the alv
Dental cosmos . pids have moved forward,and have not only filled the space, but have carried the alveolar pro-cess with them, giving the jaw a lengthened appearance. Had thelaterals been in place, their mesial surfaces would have touched thedistal edges of the centrals in such a manner as to have rotated thecentrals into the V-shaped form. The antagonism of the surface ofthe cuspids and the uniform pressure of the posterior columns ineach lateral dental arch have caused the forward movement of thecentrals without rotation. The absence, of the lateral incisors andthe forward movement of the alveolar process have caused the cus-pids and bicuspids to be carried inward, thus producing straightlines instead of curved. 14 THE DENTAL COSMOS. Fig. 14 shows the left dental arch to be of the V-shaped lateral incisor is missing and the cuspid has taken its mesial and distal surfaces of the central antagonize inside ofthe mesial surface of the left cuspid and right central incisor. Fig. Owing to the peculiar arrangement of the teeth, the forward move-ment of the posterior column has carried the central incisor inward,thus preventing the formation of a perfect semi-V-shaped arch. The right dental arch, while not perfect, yet at first sight wouldstrike the observer as fairly normal. Upon a closer inspection, how- Fig. 15.
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Keywords: ., bookauthor, bookcentury1800, bookdecade1880, booksubjectdentistry
