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SHARPENING INSTRUMENTS 67

tin, whiting and rouge are made of celluloid, felt, leather,
moose hide, soft rubber, chamois, etc.; while points for. the
same purpose are made of wood, leather, felt, chamois and

6 7 8
Fig. 82.—Carborundum disks. .,.>

soft rubber (Fig. 80). Special mandrels are made for mount-
ing all of the above (Fig. 83). Cloth and paper STRIPS

of various widths and charged with the same materials as
the disks, as well as with carborundum, flint and
lava, are utilized for finishing and polishing fill-

ings. Celluloid strips are valuable for finishing
silicate fillings and for use as matrices.

Sharpening Cutting Instruments.

The workman is known by his tools. A
glance into the operating case of a student or a
dentist is sufficient to enable a good judge to
gauge the capabilities and character of work

being done by its owner.
Catting instruments should he kept sharpened
if ideal results are desired. The possession of
a good Arkansas stone (Fig. 84) is essential to

the attainment of this object. The stone should Fig. 83.—Disk
mandrel.
be slightly moistened with a drop or two of lubri-
cating oil. Avoid too much oil. The passage of an excavator
or chisel over the stone with a few long, firm strokes will be

sufficient, if resorted to at regular intervals, to keep the