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teeth.
The apphance in position, as worn chnMng the day, is
ilkistrated by Fig. 109. After reduction of anterior pro-
trusion we are met with the difficulty of retaining the re-
suhs gained. AUhough the posterior teeth in many cases
will not furnish the resistance necessary for drawing the
anterior teeth inward, they will usually answer perfectly
P"lG. ic8.
Night Appliance.
for retaining them afterw^ard. Attachment can be made to
them either by means of a rubber plate covering the roof of
the mouth and extending around their distal surfaces in the
form of a clasp, or by means of metal bands cemented to
them. In the former case a small round or half-round gold
wire may be made to pass around the arch, touching the
regulated teeth on their labial surfaces, and be attached at
each end to the rubber plate at convenient points, as where
teeth have been extracted. In the latter case a similar re-
