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ii6 MECHANICAL DENTISTRY AND METALLURGY.

a pin or loop, which should he as near the hase of the teeth
as possible, then remove the teeth and wax. Now solder
at the points indicated either short platinum pins or loops
formed of small platinum wire or strips of plate, soldering,
of course, with a lower carat than that used in the plate;
bend or flatten the loops as desired ; clean plate thoroughly
in the acid bath, and polish that portion to be exposed to
view. Return the plate to the cast and see that it fits accu-
rately; rearrange the teeth according to the articulation;
Fig. 67.

wax up so as to entirely cover the pins or loops,—in fact,
the pins should be so placed that when the palatine surface
of the rubber is properly shaped they will not be exposed
in the least. The case is now ready to be flasked, vulcan-
ized, and finished up as usual. The principle is illustrated
in Fig. 67.
Another method of increasing the attachment l^etween
the metallic base and the rubber, is that of spurring the plate
over the ridge with a sharp-pointed chisel, as shown in
Fig. 68.
When aluminum is employed as the base, the strongest
and altogether the best means of increasing the attachment
is that of cutting or punching loops from the plate itself.