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EXTRACTION OP PERMANENT TEETH 249
the principle is applied which removes a corkscrew from a cork,
right or left thread.
Inferior Cuspids. Traction with slight rotation. Labial pres-
sure. The rules for the extraction of inferior cuspids are quite
Fig. 122.—Position for extracting right superior bicuspids.
similar to those for the superior cuspids, adding only that owing
to the curve sometimes found in its single root, it is well to direct
the line of traction force a little backward.
Superior Bicuspids. Principally tractions, parallel with the
