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CROWN- AND BRIDC.K-WORK. '59
A very neat and satisfactory retainer for the lower jaw
is represented in Fig. 121. It is simply a wire crib, and can
be constructed of platinized gold wire. The wire is bent
with pliers and clasp-benders to fit the labial, buccal, and
lingual surfaces of the teeth accurately. This is best done
on a die. A smaller wire is then accurately fitted at inter-
FiG. 122.

vals and tacked to the two base wires wath a little gold
solder. These small wires rest in between the teeth on the
masticating surface, holding the base wires against the teeth
and at the same time preventing them from being worked
down into the g"um tissue. The whole appliance should be
so closely fitted that considerable'pressure will be required
at first to force it home, as shown in Fig. 122.

CROWN- AND BRIDGE-WORK.
Preparation ^of the Root for an Artificial Crown.—All
remaining portions of the natural crown should first be
removed with suitable instruments. If the cervical portion
of the tooth is comparatively sound and unbroken, this may
be most expeditiously accomplished, and with less risk of