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CORRKCTIOX OF DENTAL IRRKGULARITIES. 137
position 1)\- llie strain upon it, it should be secured to the'
teeth of the arcli ])y h' matures.
Correction where Cuspid Tooth is Inside the Arch.—The
power usually necessary to move an inlying cuspid is very
great. Hie jack-screw is therefore one of the best forms
of appliance; this, however, may sometimes be aided by
what is known as the inclined plane. Dr. Angle's method
is showai in Fig. 93. The base of the tube containing the
screw-bar, or jack-screw, is soldered to a band encircling
Fig. 92.
iiiiliyiCiili'i'j'

the opposite cuspid and reinforced by a spur resting against
the first bicuspid (see illustration), and also by the large
traction screw, which is hooked into a pipe soldered to the
labial surface of the band and passing in front of the in-
cisors through a tube soldered to a band on the labial sur-
face of the lateral incisor, against which the nut works. In
this case, the left central and lateral were moved forward
in the line of the arch, thereby closing the space between
the centrals, and, at the same time, providing space for the
out-moving cuspid. The large screw was beaten flat and
polished before insertion.
The Inclined Plane.—One of the earliest methods em-
ployed in correcting or aiding to do so, where the superior