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FILLING BY CLASSES AND MODIFICATIONS. 225

difficulty is somewhat obviated by placing a piece of
polished metal, of the proper thickness, back of the
cavity, against the adjoining tooth, introducing the
filling, and consolidating it firmly up to this piece of

metal : the lost portion of the crown being thus
restored, the metal is then removed, and the filling
dressed off and finished in the manner described
heretofore. But when the opening is made by cut-
ting in. from the masticating surface, the entire
opening, made in the tooth, both by the decay and
the operation will be completely filled, and the form
of the tooth entirely restored ; the filling will then
present a proximal and crown surface. When the
teeth, molars and bicuspids, are decayed upon their
contiguous sides, the cavities in both may be prepared

as already described, the proper separation and
excavation having been made, both are filled together,
the gold extending across the space, and after being
filled up flush with the masticating surfaces, the
separation is effected by dividing the gold with a
separating file : thus, each cavity is completely filled
and there is always gold enough upon the proximal
parts to secure a complete finish. This method is

not always practical, as for instance, when there is a
large space, or when it is not desirable to fully restore
the form of each tooth, but in some cases it may be
used with decided advantage. The labor, tedium.