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142 PREPARATION OF CAVITIES

surface cavities. The cuttings are to be made with vulcanite

chisels and scrapers, after drawing the outline form with
pencil. Deepen the convenience angles with hatchet and hoe
excavators and chisels.
3. Preparing cavities in the ivory teeth carved in the
Dental Anatomy Technic Course. Typical cavity forms are

made with the chisels, hatchets and hoes.
4. Preparing Cavities in Extracted Teeth.—First, soak
the teeth in glycerin one part and water two parts, to render
them less brittle. Select teeth with cavities of decay and pre-
pare typical cavities, with the same instruments as indicated

above. Avoid exposure of the pulp, and, in chiselling enamel,
cut in the direction of the rods, finally bevelling in the various
locations to avoid leaving any unsupported rods.
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5. Preparing Cavities in the Typodont or Odontotype.
Practice the proper rests and guards.