Page 178 - My FlipBook

174 FILLING TEETH.

than they should be. It is true that in both, the
force can be regulated
Fig. 45.
to the most minute de-
gree, between a very
light and a very strong
stroke ; it cannot be
done however, without
giving special attention
to that particular; which necessitates an

arrest of the operation of the instrument.
An instrument is made by Dr. S. B. Pal-
mer, in which the force of the blow is placed
completely under the control of the opera-
tor, while it is being used. The operation
of this instrument is perhaps less objection-
able, in respect to the character of the
stroke, and its control by the operator, than
any other as yet employed. Any of these
instruments are valuable in the hands of

those who become familiar with their use.

CRYSTAL OR SPONGE GOLD.

The form of the cavity for crystal gold filling,
should be much the same as that described for other
fillings, except that the same care is not necessary for
special retaining points; for the first portion of good