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36 MECHANICAL I>ENTISTKY AND METALLURGY.

possilile. Where only one or two teeth are missing- it is
better to select several and match tliem in the month, as
we often find that two teeth may closely resemble each other,
yet when tried in the month it is seen at once that, thongh
little different in color or tone, one is far l)etter than the
other. Where fnll sets are required, the age and tempera-
ment of the patient should be the principal guide.
Fig. 13.

Bilious.

Fourth, the position of the pins. Pins are arranged
transversely and perpenchcularly, and are known as cross
and straight pins, respectively. In metal work, that is,
for metal plates or crown- and bridge-work, straight-pin
teeth should be used wherever possible and the cross-pins