Page 219 - My FlipBook

FILLING BY CLASSES AND MODIFICATIONS. 215

ing, reference should be had to this particular. Two-
thirds of the cavity may be filled by introducing the
gold upon and in the direction of the cervical wall,
and the remaining portion filled from the point back
to the preceding filling; or, what is probably better,
begin at the bottom and fill to the surface, and then
finish in the usual manner.
For filling these cavities with non-adhesive foil, the

special retaining points already described are not re-
quired ; but the cervical wall of the cavity is slightly
cut under, and the lateral walls so shaped as to secure
the filling in place. These cavities are in some cases
very difficult to fill with non-adhesive foil, whether in
the form of blocks or otherwise, especially where they
are large, with the walls inclined to the center, and

the tooth bone friable. To force a .wedge-shaped in-
strument into these fillings, for the purpose of con-
densing them, is inadmissible, since there is thus great
danger of breaking the walls of the cavity, and, in
many cases, of moving the filling from its place.
1st Mod.—The palatal wall broken away. Fractures
of this kind assume different forms; sometimes trian-
gular, extending from the border of the cavity toward
the center of the tooth, and terminating in an acute
angle; and sometimes the border of the cavity is

broken away irregularly, or so as to form part of a
circle. When a triangular notch is broken out of the