Page 118 - My FlipBook

I02 THE TREATMENT OF TEETH
cohesive gold up to the knuckle, and the building
up of the rest of the filling with cohesive gold, is
all that is now likely to be attempted. In these
cases it is generally impracticable to depend in any
way on the spreading power of the wedge, although,
if a matrix is used, this procedure may be resorted
to. The gold should be packed towards the cervical
wall, leaving as much overlap as the presence of
the adjacent tooth will admit of. The gold should
be thoroughly condensed, and fine points should be
used against the walls to ensure adaptation. "When
the knuckle is reached, cohesive gold is attached
to the last layer of the non-cohesive gold before it
is completely condensed, either by means of sharp,
deeply-serrated pluggers, or by forcing small pieces
of cohesive gold into depressions made in the non-
cohesive, at the lateral Avails. The cohesive top is
then built up and securely locked in place by
means of a step anchorage, or undercuts, in the
occlusal surface. When all the non-cohesive gold
is in place, the part still to be filled must be re-
garded as an independent cavity, with the non-
cohesive gold forming the cervical wall. When the
cohesive portion is completed, the non-cohesive
overlap should be condensed as much as possible.
Broad-faced hand -pluggers. with the condensing
surface in the same plane as the shanks ; foot-