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284 THE TECHNICAL PROCEDURES IN FILLING TEETH.

all three of which are being gradually covered. The filling is
extended to its full thickness and finished to its full contour as
this building of gold proceeds. During the progress of this
building, it will be necessary to frequently mallet the lingual
portion along the lingual wall with the Varney foot plugger,
often adding more gold to carry the building well over the lin-
gual margin. The approach in doing this must be from the
lingual, and the line of force in a distal cavity, as this one, should
be as much toward the mesial as practicable. In a mesial cav-
ity, the line of force should be toward the distal. This should
be directed especially to wedging the gold more firmly against
the lingual wall and building over the cavity margin.
Incisal retention. When the cavity has been filled in this
way about to the point as shown in Figure 368, attention should
be directed to filling the undercut for retention at the incisal
angle. This must be done with the right angle plugger by hand
pressure in practically every case in which the proximating tooth
is present. In most instances, more building on the filling should
be done by the mallet plugger, following and supporting the
building into the retention point. This should be continued
until the incisal portion is tilled and the body of the filling has
been built across with the incisal portion to the labial wall and
thoroughly wedged in. This will bring the filling to the con-
dition shown in Figure 369. The undercut for the incisal anchor-
age is shown in mesio-distal section after the filling has been
placed in Figure 372. In comparing Figures 368 and 369, the
filling is shown to have progressed in all of its unfinished parts
during the Iniilding of the gold into the incisal anchorage, con-
tinually supporting it and enabling one to make firm work in
every part. To build the gold into this anchorage without this
continuous support by the gold built up with it, would be to
lose that strong grip the cavity will have upon the filling in this
direction, and with it much of the rigidity with which the filling
is held in its position. This is a point that should have the most
careful manipulative study in order that one may uniformly
so contrive his work in its progress, and so correlate the advance
of its several parts as to obtain the firmness of this grip of the
cavity on the filling. The main difficulty observed among stu-
dents in their school training, as well as in the work of practi-
tioners, is in the correlation of tliis particular part of the work
so that they may have the ])est opportunity at every point. Notic-
ing carefully the varied directions of the angle of force required
just at the point shown in Figure 368, and between it and the