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LOWER PROTRUSION. 775

Fig. 759. Teeth as far back as possible should be selected for anchor-
age. The anterior portion of the bow should be as near the cutting
edges of the incisors as the occlusion will allow and may be prevented
from sliding toward the gum by one or more small hooks over the cut-
ting edges of the teeth or by bands on incisors or canines with lugs or
notches. (See Angle's notches in retracting appliance, Fig. 771, c, c.)
, Dr. C. S. Case utilizes the upper teeth for anchorage. The labial
bow previously referred to is applied to the lower teeth and has a
button attached to it near the canine on each side. From this button
a rubber band is extended to a similar button soldered to a liand on
an upper molar, as far back as possible. The tendency of this is to

Fig. 781.

Excessive development i.if lindy ( if lower maxilla (Talbot).
draw the upper teeth forward, but more especially to draw back the
anterior lower teeth and also the jaw itself.
—
Fig. 782 shows Prof. Angle's appliance for this purpose " the large

Fig. 782.

Angle's appliance.

traction screw being attached to clamp bands which encircle the first
lower molars and the angles of which are hooked into small staples