Page 189 - My FlipBook

THE FINISHING OF FILLINGS.
175
In the crowns of bicuspids and molars, I like finishing burs and
burnishers in the engine when the fillings are small. Where they
are of medium or large size I use them first, for the reason that a
more
thoroughly dense surface is obtained by burnishing. But for a
final finish I do not admire the the burnisher.
irregular surface left by
I therefore depend upon small fine corundums, Hindostan and Ar-
kansas stones, finishing with
pumice and chalk, used one after the
other on the soft-rubber disk.
Amalgam. The same general rules of aiming at and obtaining
a lustrous polish are to be observed with this much-abused material.
The approximal trimmer, however, will not avail, and for this reason
the gingival margin should be made as nearly perfect as possible
whilst the material is The sand- paper disk will do much
yet plastic.
along this part of the approximal surface, but will not always reach
the extreme gingival margin. Here a fine finishing file having a small
end, somewhat similar to the approximal trimmer, will serve well,
the final finish being given
with a spatula cut from ~
FIG. 200.
orange- wood, and used in
connection with the pol- r-^_ .,., j,
~ """
In crown ^^"r v""1" " * c
ishing- powders.
and large contour fillings,
after using the rubber disk with pumice
and then with chalk, nothing makes an
so handsome as the use
amalgam filling
of the small engine brush- wheel, ofmod-
erate stiffness, used first with moistened
pumice and then with dry chalk. I dis-
miss this class of a
fillings resembling
mirror in color and luster, and they keep their handsome appearance
a dull in time.
long time, remaining forever smooth, though getting
Oxyphosphate. \Vhen used as a permanent filling, this material
should be allowed to set thoroughly hard before any attempt is made
to trim it to shape, and when shaped a final finish may be made with
the pouncing-paper disk, followed by the chamois strip without
chalk. The dam being still in place, the filling should be thoroughly
coated with chloro-percha, which should be allowed to harden by
the of the chloroform before the dam is removed. If
evaporation
this rule is properly observed, this film of chloro-percha will often be
found upon the filling two weeks later. Thus the material has been
from moisture until hardened to a not otherwise
protected density
attainable.
This material is trimmed to with warm bur-
Gutta-percha. shape
nishers, and then quickly hardened by applying cold water. After