Page 203 - My FlipBook

FILLING BY CLASSES AND MODIFICATIONS. 199

filling may be commenced at the bottom of the cavity,
and built up from that to the orifice, the same plan
being followed in adapting it to the walls as with ad-
hesive foil, the pieces being passed into the cavity
with either the plugging pliers, or a condensing in-
strument. Each piece should be well consolidated
before another is added. For condensing the filling

next to the walls, a small wedge-shaped instrument is
valuable. In all cases where there is a divergence of

the anterior wall, much care is required in order to
make a perfect filling; and too much care can not be
exercised in perfecting the filling round the border of
the cavity. In condensing adhesive foil or crystal
gold, the force may be applied almost exclusively in
a line with the axis of the tooth; and this is always
preferable to lateral pressure.
1st Mod.—Extension of decay along one or more

crown fissures. In a case of this kind, the central
cavity is first to be opened and excavated, according
to the principles already announced. Decay in the
fissures is in some cases an extension of this central
decay, and at the point of its termination there will
be found an acute angle ; but in others, it will be the
effect of an equal attack all along the fissure, or of
an extension from some other point than the central
cavity. This modification of decay may terminate

either in an acute angle, or in an expansion.