Page 162 - My FlipBook

METHODS OF FILLING TEETH.
148
loosely packed gold bulging out of the cavity. As soon as the
for which be for
cement is set, whilst waiting gold may prepared
the tooth, the next is to condense the and remove
filling step gold
the excess of cement. This done, the presentation would be as in
Fig. 1 68, a once more showing the phosphate, whilst b indicates the
gold condensed and cemented to the floor of the cavity. It is to be
noted that the unfilled of this is still retentive, so that
portion cavity
whilst the gold is actually cemented to the tooth, no special depend-
ence is placed upon that for keeping the filling in the cavity. To
continue this care must be taken to cover the phosphate at the
filling
c, so that no particles may be chipped off to inter-
exposed points c,
fere with thorough cohesion. This is best done by carefully laying
in of them at the center with the
pieces heavy foil, uniting gold
already in place, and extending them over the phosphate till the
entire floor is presented as a gold surface, when the completion of the
is Where amalgam is to be used, the
filling comparatively easy.
The
procedure is similar, with a noteworthy exception. appearance
FIG. 169.

after removal of the excess of phosphate would be as seen in Fig.
169, a as before representing the phosphate, which here extends
higher up the sides of the walls, whilst b is now the amalgam. The
would leave but a small of the in actual
completion portion amalgam
contact with the dentine. .Amalgam fillings thus inserted do not dis-
color the teeth.
In the preparation of a crown cavity in a molar, especially in the
lower it will occur that in the direction
jaw, occasionally following
taken by the caries, we discover that it has eaten its way through to
the surface. I have elsewhere said that where a
approximal cavity
occurs in the crown, and another in the approximal surface of a molar,
they should be opened up and filled as one cavity. I did not mean
"
this, however, to include all cases. My language is, Where a crown
in a or a molar is but
cavity bicuspid slightly separated from an ap-
proximal cavity, the two should be united and filled as one." The
word here indicates where I should make an to this
slightly exception
rule. Where the caries has originated in the crown, and tunneled
through to the approximal surface, we will most frequently find occa-
sion for The management would depend upon
treating differently.