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206 rRELIMINARY PBI'jrARATTOX OF CAVITIES, ETC.
This may be packed into the cavity and secured with additional lint
when required. This method is a self-sustaining one. The connection
between the free end of the anode and conducting cord is made with a
spring clip, as shown in Fig. 155.
For labial and buccal surfaces two or more small points to screw
into a common handle are sufficient (see Fig. 154). These have to be

1m<;. ir,4.

Dental anodes fur cataphoresis.
held in situ. A form and arrangement to make these self-sustaining
offers an important field for inventive skill.

Fig. 155.

Snap and wire electrode.
A convenient cathode electrode is shown in Fig. 156. In this
the surface is recessed to receive a disk of amadou (spunk) or cottonoid,

Fig. 156.

Cathode for cataphoresis.
one and a half to two inches in diameter, which retains an abundance
of a solution of sodium chlorid to maintain contact. The surface is
platinized to prevent corrosion. The reverse side has the usual
socket to receive the conducting cord, which is placed in a projection
intended to pass through an opening in the band which supports the
rubber dam.
It is indifferent where this electrode is placed ; the objects to be
attained are to lessen the resistance as much as possible and to secure
constant apposition with the surface with which it is connected. If the
person be comparatively lean, the face before the ear is to be preferred.