Page 115 - My FlipBook

FILLING WITH GOLD. Ill

well squared, as made with an inverted cone bur, this first piece
of gold will remain firm.
Next proceed to build up a mass of gold upon the first piece
and extend this along one of the axial or pulpal angles to the
second convenience point and unite the two. When this has
been done the lodgment of the gold should be so secure that
there will be no further fear of movement and the body of the
filling may be built upon this foundation.
If the case is an occlusal cavity the building should at
first be about equally upon the pulpal and distal walls, forming a
triangular mass filling the disto-pulpal line angle and extending
to the buccal and lingual walls. Later, after the anchorage has
been made still more secure by some building across and across
against the lingual and buccal walls, the building should proceed
more rapidly upon the pulpal wall until this is covered and the
gold brought securely into all of the pulpal line angles.
In no case should there be any attempt to spread a
thin layer of gold on the pulpal wall, or any other wall,
of a cavity and condense it in a thin sheet. Any such
attempt insures a failure of perfect adaptation to the wall
of the cavity. Always secure a thick mass of gold along a line
angle and build out on the wall gradually, keeping the thickened
mass close to the margin of the building as it progresses over
the wall that will keep the margin from curling away from the wall
as it is condensed.
The angle toward the plane of the wall at which the con-
densing force is applied is very important in making perfect
adaptation.
The direction of force should never be perpendicular
to the plane of the wall that is being covered. Whenever
possible the angle of force should be inclined as much as twelve
centigrades from the perpendicular to the plane of the wall. In
adapting gold to the surrounding walls in an occlusal cavity the
direction of force should be inclined toward the wall, "if possible,
as much as six centigrades. It is quite possible, by using the
wedging principle, to secure good adaptation if the angle of force
is parallel with the wall, but it is more difficult.