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190 MECHANICAL DENTISTRY AND METALLURGY.

the mouth as presented for which the bridge was con-
structed. Fig. 168 shows the piece in position.
A case, which is a type of a class of frequent occurrence,

Fig. 166.

is shown in Fig. 169. Alternate molars and bicuspids in
the upper and low^er jaws are lost, until the occlusion is
somewhat changed, and the force of mastication is grad-

FiG. 167.

ually brought upon the front teeth. Rapid wearing of these
teeth results. The cases are among the most difficult that
the operator is called upon to treat l^y the ordinary methods.