Page 724 - My FlipBook

722 ORTHODONTIA AS AN OPERATIVE PROCEDURE

has one advantage, that the patient may be allowed to remove the plate
for cleansing -without danger of losing the rubber band.
If the adjacent teeth need to be moved apart to make room the
rubber band may be fastened to the
^^' ^^ '
plate at two j)oints, as shown by the
dotted lines in Fig. 059, or farther
apart, so as to jiress laterally as
well as backward.
The plate may be ligated to teeth
on each side of the mouth to hold it
"V'^y^z/f/'^ '^ "'*'" more securely, and a silk or linen
ligature may be substituted for the
Talbot's spring with bands, for making room.
rubber band.
Fig. 660 shows Dr. Talbot's plan of gaining room by means of a
coiled spring with the ends resting on the teeth to be spread apart.
The plate may be dispensed with by cementing a band, to which a
hook has been soldered, on some tooth in line with the movement de-
sired, and stretching a rubber band from the prominent tooth over this
hook. The anchorage may be increased by a wire or bar soldered to the
outside of the band so as to rest on contiguous teeth. (See Fig. 661.)

Fig. 661.

Band and bar fur anchorage; rubber band for drawing tootli in (Guilford).
In order to apply the force in the proper direction in moving a cen-
tral incisor, it may be necessary to use a tooth on each side of the mouth
for anchorage, in which case it is better to extend a rubber band from
each anchor tooth to a hook on the lingual surface of a band on the
central. (See Fig. 662.)
The occlusion may be such that the cutting edges of the lower in-
cisors nearly or quite touch the necks of the upper or the gum, and
thus prevent the use of any appliance on the lingual surfaces of the
teeth without opening the bite, which it is best to avoid if possible. In
such cases (see Fig. 663) cement a band on a bicuspid or first molar on