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FILLING CAVITIES WITH COLD, BY CLASSES. 283

Gingival portion. First fill tlie linguo-axio-gingival con-
venience point, approaching from the labial with the plugger
and from the lingual with the holding instrument. Select a
piece of gold that seems a little large for the place, carry this
into the cavity with the foil carrier and catch it with the hold-
ing instrument. Then exchange the foil carrier for tlie plugger
5-10-3 or 71/0-] 0-3 and with the two instruments bunch the gold
into the angle and begin the condensation by hand ])ressure.
Change to mallet pressure after the gold is well started into
the convenience point. This should always be filled very solidly,
using rather light blows with a small condensing point. Heavy
blows are too liable to check the dentin and enamel. After the
immediate convenience point has been filled, build more gold
about equalty on the gingival, lingual and axial walls, as shown
in Figure 366. Then fill the labio-axio-gingival angle in the
same way, making the approach from the lingual. This is also
shown in Figure 366. These convenience points are shown in
Figures 170-173, and in section after the filling is placed in Fig-
ure 373. The next step is to build along the axio-gingival line
angle connecting these two points, as shown in Figure 367. The
greater part of this may be done from the labial approach, build-
ing against the gold built into the linguo-axio-gingival angle.
In manj^ cases it will be more convenient to vary this by build-
ing along the axio-gingival line angle to the labio-axio-gingival
angle before this is filled and finishing these steps by the filling
of the convenience point in this latter angle.
Up to this point, the gold has not been built over the gingi-
val cavo-snrface angle at any point. The lamination of the gold
built into the linguo-gingival line angle is shown in Figure 279,
in a mesio-distal section of another case. This form of building
should be continued as the work progresses further until the
gingival margin of the cavity is covered.
The gold should next be built up on the lingual wall of the
cavit}^ at first in a triangular form, and gradually over the cavo-
surface angle at the linguo-gingival, then along the lingual wall,
at the same time adding more on the gingival wall, the gold
being thoroughly wedged against the labial. The building along
the lingual wall should always be in advance, farther toward the
incisal, than the building along the labial wall, as shown in Fig-
ure 368. In all of this work, except that directed against the
labial wall with an angle of force from the lingual, the angle of
force should be directed midway between the lines of the gingival
and lingual walls and inclined toward the plane of the axial wall,