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plasti:r models or casts. 25

ities of the case and to aid von in adjnsting' the casts so that
the occlnchng' snrfaces will correspond exactly with the
articnlation of the natnral teeth. lUit where the nnnil)er
of teeth missing' is so great, or where for any reason there
is any d(^nht as to heing ahle to articnlate the casts in this
way, and where the cast is not snfhciently large to require
a l)ase-plate. etc., a \ery simple method is to take a small
Fig. 10.

roll of softened wax an inch or more long, according to
the nnmher of teeth lost, place this wax between the re-
maining teeth, pressing against the teeth on either side of
the space, and direct the patient to close the teeth naturally,
that is, to bite into the wax until the cutting edges and cusps
are brought firmly and accurately together. The wax should
now be pressed firmly against the ridge where the teeth are
to be replaced, and against the outer, that is, the labial or
buccal, surface of the antagonizing teeth. This bite should
now be chilled with a few drops of cold water and removed
from the mouth. With this guide the casts may now be
nicely adjusted in the articulator.
Carving the Model.—In order to secure a close adaptation
of the plate at every point—which is necessary to secure
3