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98 INSTRUMENTS FOR FILLING.
In all cases they should be as thick as possible, with-
out being thus impaired in their efficiency ; so firm

that there may be no springing or tremulous motion
under the pressure they are required to sustain. For
separating front teeth, however, they must be thin
enough to pass readily into the intended space, and

Fig. 3.

about one-fourth of an inch wide at the edge. But,
for separating bicuspids and molars the instruments
should be thicker and broader • as thick, indeed,

Fig. 4.

as the required space will admit. In some cases,
they should have the edge oblique, as in Fig. 5.
It is seldom that these instruments need any curve.

Fig. 5.

The straight form is the best, unless, as it rarely hap-
pens, the point to be operated upon cannot be reached

efficiently with it; as, for instance, in a small mouth,
a slight anterior curve will be required in the shaft