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COHESIVE GOLD IN THE MAKING OF FILLINGS BY CLASSES 131

pellet of gold added, the wedging principle is made most effective
by the following order of stepping: Center of filling first; contour
second; ascending line angles third; surrounding walls fourth and
against ascending cavo-surface angles fifth, keeping the long axis
of the plugger shaft at about a twelve degree centrigrade angle to
the axial, buccal and lingual walls.
When the Gold Extends Beyond Contour it should be burnished
back to correct position and the plugger again stepped along the
contour, holding the plugger close to a line of the long axis of the
tooth, instead of striking the gold at nearly a right angle to this line,
a practice so common with operators, and one that has a tendency to
unseat the filling and separate the layers of the filling already con-
densed.
The Progress of the Filling should be kept on a plane parallel

Fig. 75.— Starting cohesive gold, second plan.
to the plane of the gingival wall and kept in this plane to near the
completion of the filling, having a strict care as to complete contour
in the proximal, as the filling advances.
Covering the Pulpal Wall. There are two plans of covering the
step portion in Class Two. Tlie First Plan. The first and most
common is to build the cavity portion to a level of the pulpal wall
and gradually cover the pulpal wall by allowing each pellet of gold
to extend a little farther than the previous one out over the pulpal
wall till the pulpal point angles have been reached.
The Second Plan is to start an independent body of gold in the
pulpal point angles, in one of the three ways outlined in starting the
cavity portion on the gingival wall and finally uniting the two por-
tions of the filling. Whichever plan is used nothing should be done