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CHAPTER IV.
INSTRUMENTS FOR FILLING.
In describing the instruments for filling teeth, it
will be convenient to take them somewhat in the
order in which they are employed in ordinary prac-
tice first referring to those which are used for cut-
;
ting away portions of the teeth, for the purpose of
separating them, and for dressing off the borders of
cavities ; then to those for removing decay and form-
ing the cavities ; and finally to those for introducing,
consolidating, and finishing fillings. The first, then,
that claim our attention, are the
HEAVY CUTTING-INSTRUMENTS.
These are of the thick chisel shape. They should
be of good steel, well wrought, and thoroughly tem-
pered. Every step in the process of their manufac-
ture should be most perfectly executed, so as to in-
sure an edge that will cut not only dentine, but also
enamel, which is the hardest animal substance. Va-
rious sizes of the straight chisel form are required.
