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26 DENTAL ANATOMY

details are then brought out by means of the modehng tools.
A natural tooth in front of the student serves as a guide.

Carving Teeth in Plaster

The denomination of the teeth and the number to be

carved will be regulated by the time at the disposal of the stu-
dent, in the discretion of the teacher. The technic of carving
is practically the same as that described for ivory teeth
and the student is referred to that section (page 27). The
teeth are to be carved from plaster blocks to Black's average

measurements, multiplied five times. The entire root should
be carved. These teeth may be used later for technic work
in cavity preparation.

Carving Teeth in Soap

The best soap for the purpose is Procter and Gamble's Ivory
soap. This should be cut in blocks of proper dimensions,
and laid out for hardening or seasoning for two weeks previous
to the carving, otherwise it is too soft.
Carve all the teeth natural size, upper and lower of one

side. The cuttings are made with a knife and wax spatula,
the finer carving being done with the excavator or small chisel.
The final polish may be put on by gently rubbing with the
finger. The technic is the same as given under ''Carving in
Ivory," except that the cuttings are done with a knife, wax

spatula, chisel and excavator.

Carving Teeth in French Chalk

French Chalk.—Synonyms, Soap-stone, Talc, Steatite.

—Chemical composition, magnesium silicate.