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CORRECTION OF DENTAL IRRKCULARITIES. 147
face a rounded prtjjecliuii to receive the standard (cupped
at its free end) of the long traction bar, Fig. 107. In use,
the clamp-bands (D) are attached to the anchor-teeth, and
the plain bands cemented to the central incisors. The bow-
spring is now placed in position.
Fig. 106.

Occipital resistance is obtained by means of a netted cap,
fastened to a circle of wire fitted to the head, to which are
attached rubber bands. When the cupped standard of the
traction bar has been placed over the central spur of the
bow-spring, the rubber bands of the cap are drawn forward
and looped over the curved ends of the traction bar, as

Fig. 107.

shown in Fig. 108. This cap, traction bar, and rubber
bands are worn only at night, on account of their conspicu-
ousness.
During the day, rubber rings (B, Fig. 106) are caught
over the tubes on the molar bands and secured by ligatures