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LABIAL ERUPTION. 721

nent one and thus to impede the very movement desired. One practical
objection is that the rubber band tends to rotate the teeth over which
it is looped. Tlie rubber band may be ligated to the second tooth on
each side and passed under the first.

Fig. 658.

Rubber band and ligature.
The next simplest method is the strip of elastic German silver as
described by Dr. Talbot — ^just the reverse of that shown in Fig. 649.
One of the oldest appliances and an excellent one is shown in Fig.
659. It consists of a plate fitting the roof of the mouth, held by atmos-

FiG. 659.

Plate and rubber band.
pheric pressure in contact with the lingual surfaces of the teeth except
w'ith that of the prominent one. A rubber band stretched over this
tooth is attached to the plate at some point directly in line with the
movement desired, and far enough from the tooth to give the desired
amount of force. For attachment a hook may be vulcanized, or a hole
drilled in the plate at an acute angle, and a wooden peg inserted, which
is kept tight by swelling. Another simple way to attach the rubber
band is to drill two holes through the plate and tie with thread. This
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