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138 THE TREATMENT OF TEETH
They
the approximal surfaces of amalgam fillings.
are very thin and pliable, and
can be easily bent to any
desired angle.
General Consideration of Amal-
gam Fillings.—The disadvant-
ages of amalgam have been
pointed out, and some of its
u advantages alluded to. One

great advantage is the compara-
tive ease and rapidity with
which it can be introduced,
and the hardness and general
I insolubility of the material. Its
m colour is not good, and any of
D.M.C?LR
the lighter coloured kinds that
are useful for general purposes
will deepen or become tarnished
according to the position of the
A approximo-
filling. large
occlusal filling, for instance, may
maintain its colour on the mas-
ticating surface as far as the
knuckle ; from the knuckle it
Fig. 10.
will often show gradation of
colour varying from a slate-like or dirty grey from
the knuckle, to an almost complete black at the