Page 233 - My FlipBook

FILLING BY CLASSES AND MODIFICATIONS. 229 ;

gum, the pulp having previously receded so as not
to be exposed. It is, in such case, desirable to re-
store the lost portion of the crown, and make a mas-
ticatory surface such as shall antagonize properly
with the teeth of the opposite jaw. As yet, there is
no other method of accomplishing this, than by build-

ing it up with gold—adhesive gold foil or crystal
gold. In the preparation for this crown of gold, the
edge should be dressed smooth and even all round
the tooth ; then six or eight deep pits should be made
at different angles about on the base thus prepared
and they should be bored with a drill larger than is
commonly used for retaining-points. These pits may
be slightly enlarged within. The method of building

up the crown is just the same as that described for
building up part of a crown, the pits being first filled,
then joined together, and the gold extended all over
the part to be covered by the filling. In extending
the gold from a retaining point or points, it is neces-
sary to build up to a considerable thickness above the
orifice of the pit. The portion of gold extending
along on the tooth from the pit, should be quite thick
and firm, so as not to curl up from its position, on

the addition of subsequent portions. Every particle
of gold, indeed, should be so manipulated, that it will
securely maintain its first position. The permanency
of the operation will depend very much upon this