Page 584 - My FlipBook

280 THE TECHNICAL PEOCEDUEES IN FILLING TEETH.

found in distal cavities in lower bicuspids which have a very-
strong disto-lingual inclination. The cavities in some of these
are so situated that they may be filled easiest with the back-
action instruments, aided by hand jiressure along the lingual
wall. Otherwise they must be filled wholly by hand pressure.
In distal cavities in lower bicuspids, and occasionally in
lower molars, in which access may be had with a direct-acting
instrument to pack gold in the linguo-axio-gingival point angle;
but access may not be had with a direct-acting instrument in the
bucco-axio-gingival point angle, a slight modification of the
usual cavity preparation may be made in some cases to simplify
the procedure of placing the gold. The lingual end of the axio-
pulpal line angle may be cut and so rounded that the linguo-axial
line angle will curve to the mesial, and the linguo-pulpal line
angle will curve to the gingival, the two joining to make one
continuous curved line angle from the linguo-axio-gingival point
angle to the linguo-pulpo-mesial point angle. The first pieces
of gold should then be condensed in a convenience point in the
linguo-axio-gingival angle, and the building should continue
along the linguo-axial line angle in the occlusal direction and
then follow the curve of this angle into the step portion of the
cavity, along the linguo-pul])al line angle in the mesial direc-
tion to a convenience point at the linguo-pulpo-mesial angle.
By this plan the gold may be securely anchored between the two
points entirely with direct mallet force, and will be easily and
quickly accomplished. The subsequent packing should be across
the gingival wall from lingual to buccal, and it will be easier to
fill the bucco-axio-gingival point angle on account of the fact
that the mass of gold is held securely between the two conve-
nience points already filled.
The after condensation in distal cavities is made with the
back-action quadrangle instruments, Figures 331, 332, easier
and more perfectly than with any other. They may be readily
adapted to any distal surface in the molars and bicuspids after a
little experience in their use. The rights and lefts relate to
the right and left side of the individual tooth. In other words,
the one fits for the buccal embrasure and the other for the lingual
embrasure in distal sui"faces.
Class 1. Cavities Beginning in Pits and Fissukes.

Occlusal cavities. Filling occlusal cavities with cohesive
gold is so nearly the same as filling the step portion of mesio-
occlusal cavities, that little more need be said. They are the