Page 758 - My FlipBook

756 ORTHODOyilA AS AN OPERATIVE PROCEDURE.
between which is ii straight part which lies near the Hoor of the
mouth.
When the arch has been spread the bent wire c, Fig. 741, is sub-
stituted for the spring or jack-screw for retention. It may lie along
the necks of the teeth, and in such position be utilized for attachment
of rubber bands for retracting or rotating incisors, as shown in Figs.
667 and 713. The long wire a, b, Fig. 741, is used for moving incisors
forward, as shown in Fig. 729. These two wires are the labial and
lingual bows previously referred to.
Fig. 745 shows one of the author's "partly made" appliances,
which can be readily applied to the teeth of a patient or to a plaster

Fig. 745.

Partly made appliance for expansion.
cast by bending the partly made bands around the teeth and completing
them as in Fig. 630.
Fig. 746.

Partly made expander applied to plaster cast.
The perforated bar soldered to the first band ribbon slides through a
flat tube on the second band ribbon, and thus allows adjustment accord-
ing to the amount of room desired between the bands. Fig. 746 shows
the completion of the appliance.