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OBTURATORS AND ARTIFICIAL VKLUM. 12

The lettered portion of this appHance is made of soft vul-
canized rubber; its attachment to the teeth of hard vulcan-
ized rubber, to which the velum is connected by a stout gold
pin firmly embedded at one end in the hard rubber plate.
The other end has a head, marked c, which, being consid-
erablv larger than the pin, and also the corresponding hole
in the velum, it is forced through, the elasticity of the

Fig. 79.

velum permitting, and the two are securely connected. Fig.
78 represents the appliance in situ.
Dr. Suersen's Method.—The principles of the appliance
introduced by Dr. Wilhelm Suersen, of Berlin, has seemed
to many to be the best for obtaining correct articulation.
An ordinary plate is constructed, suitably attached to the
existing teeth and covering any fissure that may exist in the
hard palate. From the posterior border of this plate, in
the center of the fissure, a hard and stationary bulb, which
may be either hollow or solid and which wall form the arti-
ficial palate, or velum, is attached. This method is illus-
trated in the acconipanying illustrations. Figs. 79, 80,
and 81.