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746 ORTHODONTIA AS AN OPERATIVE PROCEDURE.

canine depends on the j)osition of the apex of the root of the eanine,
and also of tlie lateral. If the npex of the root of the canine is so

Fig. 723.

Case treated by extraction only.

situated that the crown slants away from the median line, or will do so
after being moved into its normal position, the extraction of one or both
laterals may be admissible. If a lateral is unusually far back of the
normal line and the apex of the root also, when the tooth is moved

Fig. 724.

Showing the same denture as Fig. 723 a few montlis after extraction.

forward till the cutting edge is in line with the centrals the neck of
the tooth will be back of its proper position—that is, the tooth will
have an unnatural slant forward. This is not of as much importance as
the position of the apices of the roots of the canines, but it should be
taken into consideration in connection with the other factors.