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TECHNICAL EXERCISES 141

Technical Exercises

I. Preparing Cavities in the Bone Handle.—This handle
may be obtained from the Wenker Dental Mfg. Co., or the
S. S. White Dental Mfg. Co. (Figs. 173, 174).

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Fig. 173.—Bone handle.

Prepare with hatchets, hoes and chisels the six cavities
indicated in the illustration ; numbers i , 2 and 3 on the broad
side of the handle and number 5 on the narrow side, repre-

FiG. 174.—Bone handle.

senting the ordinary form of pit and fissure and gingival third
cavities; number 6, a proximal cavity on an incisor; number

4 on the flat end, being similar in shape to the step form in
molars.

Fig. 175.— Celluloid handle or block for cavity preparation exercises.

2. Preparing cavities in the enlarged plaster teeth, carved
in the Dental Anatomy Technic Course.
Prepare several typical form pit and fissure and smooth