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LINGUAL ERUPTION. 715

an older patient whose teeth are more firmly set, a bicuspid or first
molar alone will often be sufficient
for anchorage. Fig. 642.
For short teeth, such as decidu-
ous molars or partially erupted
bicuspids or molars. Dr. Matte-
son uses swaged caps, made with
Mellotte's moldine and fusible
alloy, so as to fit over the whole
crown and be cemented in place.
Two or more teetli may be in-
cluded in one cap, and tubes may
be soldered on either side for the
attachment of springs, etc. (See Crib and band (Jackson).
Fig. 627.)
A similar use of the piano-wire spring, but retained by the Jack-
son crib, is shown in Fig. 642. Fig. 647 shows a different form of
crib. Both Matteson's and Jackson's ajipliances are applicable to any
of the six anterior teeth.
A jack-screw with the flattened end resting in a slot in a band
cemented on the tooth to be moved and the other end soldered to a
Fig. 643.

^^V h -" \y'

Angle's jack-screw.
band on a second bicuspid or first molar for anchorage, or resting in a
socket in said band, is very efficient for moving a tooth outward, but is
more applicable to laterals and canines than centrals. (See Fig. 643.)
Another plan of retention of tlie anchor end of the jack-screw is to
slip the open end of the tube over a pin or lug jn'ojecting from tlie