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i88 MECHANICAL DENTISTRY AND METALLURGY,
Fig. 162 slicnvs a mcxlel of the mouth after the hridge
has been cemented in place.
A Lateral Bridge.—Fig. 163 is an illustration of a piece
of this work for which there is a very frequent demand. It
is for supplying the loss of the first molar and bicuspids.
If, as is frequently the case, there is extensive decay in the
cuspid, it will be best to excise the remaining portion of the
tooth and construct an artificial crown as shown in the illus-
tration. A gold cap is then made for the second molar.
If this tooth is decaYcd it will only be necessary to remove

Fig. 164.

It y

the decay, and the cement which is used for setting the
bridge will make the most perfect filling material beneath
the gold cap. The intervening molar and bicuspid crowns
are made in the following manner : the porcelain faces are
backed with gold or platinum and the tips ground squarely
off. Zinc dies, an assortment of which should be made from
the grinding surfaces of molars and bicuspids, or the die
plate which has been described in another place, are used
for swaging from pure gold, a tip or cusps for the protection