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74 MECHANICAL DENTISTRY AND METALLURGY.
accomplished with the use of the same instruments used J
in rubber work.
The final polish is given first with felt wheels and pumice
stone, and afterward with brush-wheels and chalk, taking
care not to use too much friction lest the plate should be
warped.
Celluloid Combined With Other Bases.—The combina-
tion of celluloid with other dental bases, such as rubber,
gold, and aluminum, is deserving, by reason of its merits,
of favorable consideration. In commenting on this method
Professor Charles Essig very justly remarks : " That we
J.
are able to produce an artificial denture embracing all that
Fig. 42.

is good in metallic and vulcanite work, at the same time
avoiding the great defects of each."
The manipulation and details of constructing this class
of dentures was first described by Dr. Hunt, of Indianapolis,
Ind. It is as follows : Take the impression, make metallic
dies, and form the plate as for work in the ordinary way.
After fitting the plate in the mouth, get the articulation,
the fulness and length of the teeth, remove the wax and
plate from the mouth, and make the plaster articulation.
In a full set, after separating the articulation, and before
removing the wax from the plate, take a small, light pair
of dividers, set them say one inch apart, and with one point
following the margin of the wax representing the cutting