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CROWN- AND BRIDGE-WORK. 187

Two or three typical cases will Ije described which will be
sufficient to present the subject.
Bridging from Cuspid to Cuspid. — V\g. 160 shows a
model of a mouth in which the sufierior laterals and centrals
had been extracted. The cuspid teeth were badly decayed,
with exposure of the pulps. The first step is the removal
of these pulps. The crowns are then fitted as already de-
scribed and placed in position. An impression is taken in
plaster, the crowns remaining embedded on its removal.
The impression is varnished and oiled, and a model of

Fig. 163.

investing- material poured. After this has hardened the
impression is carefully cut away, and we have a model of
the mouth with the crowns in position. A " bite " is taken
and the articulation secured in the usual manner. The re-
maining crowns, having been backed, are fitted, and the
face of the work embedded in investing material.
The whole piece is now united at the back by soldering,
and when finished presents the appearance shown at Fig.
161.