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CROWN- AND ERlUGE-WCniK. ^75

THE RICHMOND METHOD APPLIED TO BICUSPID ROOTS.
The capping" of the root is similar to that ahTady de-
scribed; the crown will have greater strength, however, if
a portion of the palatal section of the natural crown, when
strong enough, is retained, and the band made deep enough
to cover it. One pin is all that is usually required, and
where there are two distinct canals, the palatal should be
used to receive the pin ; thus greater strength is secured at
the point where it is most needed, and the pin is so located
that it will not interfere with the grinding and
adjusting" of the tooth. The cap and pin being
in position, a suitable cuspid tooth or bicuspid
facing" is then ground, backed, and adjusted to
represent the labial aspect, and then properly
secured to the cap with adhesive wax. The tooth
cap, and pin are then carefully removed, invested,
and soldered; after which they are again placed
upon the root, and the occluding" edge of the tooth
is ground clear of the antagonizing teeth at about the angle
shown at A, Fig. 139
From a suitable die or die-plate (see page
Fig. 139.
182) the cusps or occluding surface of the
tooth is swaged from 22 k. gold plate. These
cusps should then be filled in with 20 k. plate
or solder. This is done by cutting the gold
into small pieces, and placing them, Avith a
little borax, in the depressions of the cusps, all of wdiich
is held over a Bunsen burner until the small pieces are
melted, wdien they \vill fiow into these depressions and fill
them level full. The surplus is trimmed away, the cusps
ground and fitted to the edge of the porcelain, in position
to secure proper occlusion (Fig. 139), and secured wdth
wax as shown at A.
A piece of thin, pure gold plate or mica is then adjusted