Page 102 - My FlipBook

go MECHANICAL DENTISTRY AND METALLURGY.

the purpose. This is accomphshed by first flattening out
the detached portion, anneaHng it, and then passing suc-
cessive portions of its edges a sixteenth of an inch or more
between the rollers, the latter being sufficiently approx-
imated to produce a perceptible thinning of the margins.
When the entire border of the chamber piece has been thus
extended, it will be found so much enlarged that, when
adjusted to the die and swaged in connection with the main
plate, its borders will overlap and rest upon the margins of
the opening in the base, as in the other case.
The portions of the plate and cut chamber lying in con-

FiG. 55-

tact are now temporarily secured in position by means of
wire clasps as shown in Fig. 55, which, however, is illus-
trative of a full denture instead of a partial one. The edges
of the chamber are now coated with borax and small pieces
of solder placed along the line of union on the lingual side
of the plate, when the two pieces, being transferred to the
soldering block, are permanently united by flowing the
solder with a blowpipe. Sufficient heat should be applied to
induce an extension of the solder between the two portions