Page 817 - My FlipBook

UPPER DENTAL AND MAXILLARY PROTRUSIONS. 815

be not too pronounced, it may be restored by a slight forward movement
of the anterior apical zone, accomplished in the retrusion of the incisal
zone—by force applied at the incisal ends of the teeth alone, with the
yiew of producing, as far as possible, a fulcrum force at the lingual
margins of the alveoli.
If the malformation is produced bv an inharmonious union of

Fig. 853.

maxilUe and teeth, as in the former case, the extraction of an upper
bicuspid from each side will be indicated. Figs. 853 and 854 were made
from the models of a case of this character, before and after treatment.
The upper first bicuspids had been extracted some time before the
patient presented for treatment.
In contradistinction to this class of deformities, there is another

Fig. 854.

quite as common—though not so frequently recognized as an abnor-
mality— in which all the conditions are reversed, in that the teeth have
a lingual inclination with protrusion of the apical zone and maxilla?.
The teeth of these cases are commonly regular in alignment, and
owing to their lingual inclination the occlusal zone may be in proper
relative position. (See Fig. 855.)