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120 MECHANICAL DENTISTRY AND METALLURGY.
action of the soft palate, which would not permit, without
irritation, the presence of an immovable fixture.
This is contrived with a joint that will permit the part
attached to the teeth to remain stati()nar3\ while the obtu-
FiG. 74.

rator proper is carried up or down as moved by the muscles
(see Fig. 72). The joint, a, should occupy the position
of the junction of the hard and soft palates. The joint and
principal part of the appliance is made of gold, the obtura-
tor of vulcanite. The projection, b, lies like a flange upon
the superior surface of the palate and sustains it; otherwise
Fig. 75.

the mobility of the joint would allow it to drop out of the
opening. This flange is better seen in the side view marked
c. It is readily placed in position by entering the obturator
first, and then carrying the clasps to the teeth.