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CARVING TEETH 27

Excellent carvings may be made from this material, which

is of an olive-green, grayish or white color and easily obtained
from drug-supply houses. The white variety is best for this
purpose. It is readily sawed into blocks of convenient size
and carved according to the technic given for carving

in ivory. Its cutting consistence is much softer than ivory
and harder than soap. The same instruments are used, the
final polish being put on by rubbing with a smooth cloth.

Carving Teeth in Ivory

Ivory or bone blocks may be obtained for this purpose
from the S. S. White Dental Mfg. Co., the Wenker Dental
Mfg. Co. and Armour & Sons. Dr. Harper's, a set of six
blocks, and Dr. Tenney's, a set of four, are also available.

Vegetable ivory blocks are used as a substitute in some
schools. They are not so hard as the ivory or bone block,
and may be still further softened by saturation in water.
The teeth to be carved are to be decided by the teacher.

Directions for Carving

Select a well-formed natural tooth. This is to serve only
as a guide in the carving and not to be duplicated. The

ivory carving^is made to Black's measurements, with the
millimeter gauge and on completion should be within 0.5 mm.
of Black's measurements. For the lines of measurement, see
page 10.
I. Central Incisor.—The instructions for carving the cen-

tral will serve for any of the anterior teeth.
(a) With a blue pencil or ink, mark on the block the loca-
tion, taken by means of the Boley gauge, of the future con-
tact points, allowing 0.5 mm. excess for finishing down.