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FILLING BY CLASSES AND MODIFICATIONS. 195

Filling with Foil.—If non-adhesive gold is employed,
it should be formed into blocks, by cutting from four
to eight thicknesses into strips one fourth wider than
the cavity is deep, and rolling them on a broach suit-
able for the purpose, into cylindrical blocks corres-
ponding in size with the cavity to be filled, and
varying not only in size, but in form and density.
The blocks first to be introduced should be largest,
followed by those dimishing in size, the last portions

being small, dense, conical rolls. Where there is an
inward or outward inclination of the walls of the
cavity, the first blocks should be cone-shaped. For
introducing the blocks, the plugging pliers will be
required. The first block is taken up with this in-
strument, and placed against the posterior wall of the
cavity with one end on the bottom and the other pro-

truding from the orifice, and there compressed firmly
to its place with the appropriate condensing instru-
ment; and, unless there is some special retaining
point, it may be necessary to hold it in its position
with a second instrument, till the next portion is
added. As the successive blocks are introduced, each
is to be thoroughly consolidated, so as to be immov-
able. The filling is to proceed from the posterior walls
to the center. After the cavity has thus been rilled to

the center, commence in the same manner at the an-
terior wall, rilling from thence toward the center, and