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ELEVATORS. 351

should be curved to a right angle with the handle, and
the handle be straight. (Fig. 74.)
Fig;. 74.

ELEVATORS.

There are in use variously formed instruments
constructed on the principle of the elevator. They
are made with such points as to take the most tho-
rough hold on the teeth or roots on which they are
to be used, and with such curvature of shaft as to
enable them to pass most readily to the desired posi-

ng. 75.

tion. Some Jare so formed at the points as to em-
brace the root at the border of the alveolus, using

the latter as a fulcrum (Fig. 75) ; others, to pass
between the alveolus and the root (Fig. 7C) ; others,
to cut through the alveolus, and thus approach the