Page 399 - My FlipBook

GOLD INLAYS. 397
little support for the filling at the cervical margin. The fissure of
the occlusal surface must then be opened thoroughly to the end for
anchorage, and the entire margins of the cavity be excavated until they
are strong, smooth, and sharp. When practicable, an impression of
the cavity may be taken in modeling compound and run out in plaster
or oxyphosphate of zinc. To this the matrix, made of pure gold Xo.
36 B. & S. gauge, can be a})proximately fitted and trimmed, avoiding
much laceration to the gum. The matrix should be, however, finally
burnished to fit the tooth cavity. Then 22-carat gold solder should
Fig. 381. Fig. 382. Fig. 383. Fig. 384.

be flowed into the hollows of the occlusal surface, running otf into
the fissure. A coating of whiting placed on the outside of the matrix
will prevent the solder from running over the edge and destroying the
Then it must be cooled, washed, and replaced in the cavity for
fit.
further iMirnishing. When the occlusal groove is nearly full of solder,
a small globule of pure gold should be placed, as in Fig. 381, A, to serve
as a guide for the contour, which must be shaped up about the pellet
with crvstal gold or foil, into the interstices of which 22-carat solder
is to be again flowed.
" In the efforts to ol)tain anchorage on the occlusal surface punctures
or tears frequently occur. Gold foil can be inserted into these, which
when filled with solder afford excellent retain-
Fig. 385.
ing pins (see c, Figs. 383 and 385).
'"Where sufficient anchorage is easily ob-
tained, as in pulpless bicuspids and molars, a
dowel or small gold bead may be soldered to
the gold foil, and adjusted to the pulp cavity, when the first start in the
formation of the matrix is made, as in d. Figs. 384 and 385.''
Some dentists restore the tips of abraded fn nt teeth by burnishing
pure gold over the surface, running little dowels up on each side, so as
to avoid the pulp chamber, and finally moulding the contour with 22-
carat solder, gold foil, and spongy platinum.