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FILLING BY CLASSES AND MODIFICATIONS. 227

slightly convex surface, adapted and finished most
completely at all its borders. This kind of filling
can be made only with adhesive gold.
The palatal portion of the crown broken away, leav-
ing the outer portion standing — nerve not exposed.—The
tooth, in such case, is decayed away so that the floor
of solid dentine is near the margin of the gum, the
labial third of the crown still standing. The decay
having been all removed, four or five little pits
should be made on this floor, as near its circumfer-
ence as practical ; and a small groove may be cut

from one of these pits to another all round near the
edge of the floor. Then two little pits should be
made at the base of the standing portion of the
crown, if practicable, without interfering with the
pulp, provided it is still living. The decayed part
thus prepared, a sufficient shield, in the form of
paper, folds of napkin, or the rubber-dam which is

preferable, is to be thrown round the tooth, to protect
it against moisture during a protracted operation : in
this particular great care is necessary.
For building up a crown of this kind, only adhesive
gold can be used ; and this should be of the best prep-
aration, and in the most perfect condition, since it
is important that the different portions of the filling
be most thoroughly united. The instruments em-
ployed in the operation should be of the best kind