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1 86 MECHANICAL DENTISTRY AND METALLURGY.

support the intervening teeth. One molar or bicuspid on
one side, and a bicuspid or molar on the other, with the
central roots, will support a bridge between them. One
right and one left molar, with the assistance of the two cus-
FiG. i6i.

pid roots, when the conditions are favorable, as spoken of
above, will support a bridge comprising the entire arch.
It should be remembered that the preparation of the teeth
and roots for the support of a bridge is the same as has been
described for crown-work, except that^ the trimming of the
sides and the drilling of the root-canals, should be, as far
Fig. 162.

as possible, in parallel lines, so that in the adjustment of the
finished piece the crowns will move readily to their place.
The simplest and no doubt the most practical method of
bridge-work is that first described by Dr. J. L. Williams.