Dental cosmos . to the first permanent molar. The second stone is the anterior base ; it corresponds to the central incisor. The nextstone is located upon the anterior base, and corresponds to the lateralincisor. The succeeding stones are laid upon the posterior base,and represent the first and second bicuspids. The stone correspond-ing to the first bicuspid is usually in position first, but sometimes thestone corresponding to the second bicuspid is placed first. To com-plete the arch it is necessary to place the key-stone in position—the cuspid tooth. If the stones have proper proportions and
Dental cosmos . to the first permanent molar. The second stone is the anterior base ; it corresponds to the central incisor. The nextstone is located upon the anterior base, and corresponds to the lateralincisor. The succeeding stones are laid upon the posterior base,and represent the first and second bicuspids. The stone correspond-ing to the first bicuspid is usually in position first, but sometimes thestone corresponding to the second bicuspid is placed first. To com-plete the arch it is necessary to place the key-stone in position—the cuspid tooth. If the stones have proper proportions and themeasurements are correct, the key-stone will fit into place and thearch will be complete. We shall find, on examining the foundations,two more stones, which correspond to the second and third molars. ETIOLOGY OF IRREGULARITIES OF THE JAWS AND TEETH. 5 These stones, with the base and the stones above the base, make astrong abutment. In Fig. 1, the right superior arch shows the diameter of the stones Fig. to be either too small for the curve of the arch, or that the baseswere set too far apart for the curve of the arch. This results in agreater space for the key-stone than is required, and not findingsupport it drops through towards the center line. Fir, 3.
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Keywords: ., bookauthor, bookcentury1800, bookdecade1880, booksubjectdentistry
