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EXTRACTION OF TEETH. 365

Root forceps with narrow, thin beaks, which may
be readily forced between the root and the alveolus,

are very valuable for the extraction of all small
roots.
The screw, whether simple or compound, is not ap-
plicable to the extraction of the roots of the bicus-
pids.
A bicuspid will sometimes stand somewhat out of
the true circle, and the contiguous teeth approximate
so that it will not pass between them. In such a

case, the principal part of the movement for its de-
tachment should be in the direction of its inclination.
The cuspid teeth are sometimes found in the same
condition, and a similar applicatian of force for their
removal is to be made ; indeed, this method is appro-
priate to all cases where the teeth stand out of a
proper position and the contiguous teeth impinge on
the space.
Superior Molars.-—The first and the second superior

molars have each three roots, one palatal, and two
the palatal being the largest and longest,
buccal ;
and the anterior buccal larger than the posterior.
The palatal root diverges very considerably from the
axis of the tooth ; while the buccal are often parallel
with it and with each other; but they sometimes
diverge in both directions. Occasionally, the diver-
gence of some or all of these roots, is so great that