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CATAPHORIC BLEACHING OF TEETH. 557

forcing it over the tooth as though it were a rubber dam. A glass tube

Fig. 482.

is then attached to the open end of the l)ulb, and to the glass tube is
connected a spiral platinum wire electrode (Fig. 483). Before the elec-

FiG. 48.3.

Tube electrode.

Irode is attached the bulb and glass tube are completely filled with the
aqueous pyrozone solution by means of a duplex syringe (Fig, 484), the

Fig. 484.

Duplex syringe.
lower and larger bulb of which exhausts the contained air in the appa-
ratus and the smaller thumb bulb injects the bleaching solution into the
exhausted apparatus. Connection is now made with the source of cur-