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92 MECHANICAL DENTISTRY AND METALLURGY,

to the form of the ridge. The general form of a base for
an entire lower denture is exhibited in Fig. 56. The inner
or lingual border of this plate should usually be doubled.
either by turning the edge over in swaging, or by soldering
on a narrow strip of plate or half-round wire.
Reinforcing.—To secure a more perfect adaptation of the
plate to the ridge, the use of a double instead of a single
plate throughout, in which case a thin plate. No. 30 of the
gauge, should be swaged to the form of the ridge in the

Fig. 56. Fig. 57.

first instance, and then a duplicate plate, swaging the two
together and uniting them to each other with solder. A
plate of the specified thickness may be very readily and accu-
rately swaged to any irregularities in the ridge, and when
the two are united the base will be heavier and stronger
than a single lamina of the ordinary thickness. Instead,
however, of doubling the entire plate, it w^ill be sufficient,
in most cases, to adapt the second plate only to the lingual
surface of the first, extending it up from the lower edge to a
point corresponding as nearly as possible with the inner
portions of the base of the teeth when the latter are adjusted
to the plate. See Fig. 57. A moderately thin plate may.
in this manner, be used for the primary base, while the dupli-
cate band will impart the desired strength to the plate. In