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I40 MECHANICAL DENTISTRY AND METALLURGY.
pose of iiioNing a single bicuspid either inward or outward.
It is shown in Fig. 97.
A spring wire is bent in the form of a crib surrounding
the misplaced tooth and an adjoining one on each side,
passing well up toward the gum on the labial and lingual
sides, with the ends of the spring" wire terminating and
overlapping upon the tooth to be moved. The elasticity of
the spring will exert enough force to move the tooth.
Fig. ci^.

Contraction of the Arch.— -The enlargement or correction
of contraction of the arch, by lateral expansion, may be ac-
complished by a number of methods. Older practitioners
usually make use of the Coffin split plate, but as far as pos-
sible heavy, cumbersome appliances should be discarded.
Among the neatest and most effective for this purpose are
those devised by Dr. Eugene Talbot and Prof. Angle. Dr.
Talbot's method is as follows :
A vulcanite plate is made to fit the teeth and alveolar
process, and cut aw'ay so that the anterior parts extend far
enough forward to enclose the teeth to be moved. See Fig.
98. A piece of piano wire is bent into either of the forms
shown in Fig. 99, wherein a is the coil and fixed point;
b b, mo\able arms extending" from a, and c c, movable arms