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FILLING BY CLASSES AND MODIFICATIONS. 209

tailed, beginning with the cervical wall. The caution
may here again be urged, not to let the gold overlap
the tooth, particularly at the cervical wall. In filling
with crystal gold or adhesive foil, special retaining

points will be required in this wall, two being gene-
rally sufficient, one toward the outer and the other
toward the inner lateral wall, on both of which,
grooves may be made, if the walls are thick enough
to admit of it. If, however, these walls are not
parallel, and will not admit of grooves, the crown and
the cervical walls should be so shaped as to retain the

filling. But in some cases the attachment of the fill-
ing is made entirely at the cervical wall; and best by
means of three pits, made with the square-pointed
drill, at different angles, and in such directions as not
to interfere with the pulp. This kind of attachment
will serve only for adhesive gold, which is to be very
thoroughly consolidated into the pits, making little
projections, which are so many anchors for fastening
the filling, and built very firmly across from one to
the other.

2d Mod.—Decay involving a portion of the masti-
cating surface. . There are two methods of filling this
modification. One is, to cut down the tooth or the
projecting angles, and make a plain, oblique border
to the cavity by the V-shaped separation already re-
ferred to, and then fill up flush with this border. The