Page 761 - My FlipBook

THE POINTED OR GOTHIC ARCH. 759

Fig. 751. The posterior teeth shoukl be partially surrounded by the
Fig. 750.

Angle's appliance for spreading arch and reducing V shape.

plate, or by wire or clasps imbedded in the plate, to give firm anchor-
age. The rubber bands attached to the T-piece between the central
incisors should be attached to the edges of the plate as shown, in order
to apply the force in a direct line with the movement desired.
Fig. 751.

Plate for reducing V arch iKingsley).
Bauds and a labial bow (Fig. 759) may be used, in which case the
bands should be applied to tlie posterior teeth. The bow should be of
elastic wire, not smaller than No. 1 6, and so shaped as to press on the
centrals only at first. As these teeth move back and press on the late-
rals, and these in turn on the canines, and so on, the arch will spread
out and can thus be mcMildod to the shape that has been given to the
bow. This may be assisted by rubber bands from the bow over the
bicuspids and canines.