Page 187 - My FlipBook

CROWN- AND BR[DGl-:-\VORK. 1/5
llaUciied out witli a hammer. The 1)aeking- is brought down
aud closely burnished over the cutting- edge of the tooth,
which is then waxed in position, tried in the mouth, and
invested, and when ready to be soldered, these flattened
pieces of gold are laid in position, united, and filled in with
i8 k. solder, which is also brought over the backing to the
tip of the tooth. This plate and solder are afterward
brought to the proper shape and contour with the stones
and discs.
Then, again, the palatal portion of the band is extended
down so as to nearly touch the antagonizing tooth. This
leaves only a comparatively small space to be filled in with
solder, which is afterward trimmed and finished to the form
of the crown.
Another method is to back the tooth, grind off or bevel the
occluding surface, and then joint and adjust the prepared
gold cusps ; w^ax them in position, invest, and flow in sufii-
cient 20 k. solder to hold them securely in position, after
which the tooth may be ground, adjusted, and soldered to
the cap, as has been directed. One advantage of this
method is, that different forms and shades of bicuspid
facings may be so prepared—with gold occluding surfaces
—and kept in stock and again, in the latter three methods,
;
as may be seen, it is only necessary to invest the cap once
after adjusting the tooth.
Gold Shell Crown with Porcelain Facing is probably one
of the' most satisfactory forms of crown for the bicuspids.
The gold crown is made as described on page i8o excepting
that the cusps are not filled at this time.
The crown is placed on the root in the mouth, and per-
fectly adjusted to same and the articulation corrected if
need be. With an excavator the face of the crown is now
outlined where the porcelain is to appear. That is the
gum line and the points of contact with the adjoining teeth