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CHAPTER XXIV.

ORTHODONTIA EXCLUSIVELY AS AN OPERATIVE
PROCEDURE.

By Claek L. Goddard, A. M., D. D. S.

The Normal Arch.—As the study of physiology is necessary before
the study of pathology, so is a study of the normal arrangement of the
teeth necessary before the treatment of their irregularities should be
undertaken.
The ideal facial profile is shown in Fig. 598. The face from the
Fig. 598.

\
The facial profile.
hair to the chin measures three-fourths of the whole height of the head.
The forehead to the root of the nose measures one-fourth, the nose one-
fourth and the mouth and chin one-fourth. The distance vertically
from the root of the nose to its lower border is equal to the distance
from this point to the bottom of the chin. Of this latter distance one-
half is occupied by the lips and one-half by the chin. The nose, then,
equals in length the lips and chin.
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