Page 178 - My FlipBook

1 66 MECHANICAL DENTISTRY AND METALLURGY.

that will not easily clean off, with a view to fracturing it as
the diamond cuts glass, breaking it up into small pieces
which can readily be detached and the sides straightened
and smoothed by the bniad blade. The peculiarities of
shape are shown in the enlarged cuts.
The Weirich cleaver, or chisel, is shown in Fig. 131.

Fig. 130.

With this instrument and a few gentle blows from the
mallet the enamel is readily broken up and detached.
The rubber cushion in the center of the chisel takes up
the blow, thus relieving the root from unnecessary shock.
In the accompanying illustration the instrument is shown
in place ready to receive the blow from the mallet. It is a
well-known fact that with most of the appliances on sale it
is difficult to properly remove the enamel from the approxi-
mal surfaces of roots, especially where they are very close.
With this instrument (to be followed with the ordinary
cervical-wall chisel or the Chase cleavers) the root upon
all sides can be readily and properly prepared for the recep-
tion of a band or collar with very little discomfort to the
patient or trouble to the operator.