Page 767 - My FlipBook

UPPER PROTRUSION. 765

— The tooth to be extracted will depend on the same rules as in Class
7 " Prominent canines and depressed laterals."
In some cases the upper protrusion is slight, so that the anterior
teeth do not need to be moved back more than half the space left by

Fig. 761.

(lUilford's appliance for retracting upper incisors.
the first bicuspids. Then it is an advantage to have the posterior teeth
— the anchor teeth—move forward half the distance and fill up the gap,
unless that plan would disarrange the occlusion, in which case the

Fig. 7(i2.

Labial bow and plate (Kingsley).

bicuspid only may be moved forward so as to divide the space. The
cusps of the upper bicuspid and the occluding teeth may in some cases
bo advantageously ground so as to improve the occlusion.
Fig. 782 shows Prof. Anglo's appliance for reducing the lower arch,
which can be applied also to the upper. By a careful examination it
will be seen to be practically a labial bow made up in three sections.