Page 54 - My FlipBook

38 THE TREATMENT OF TEETH
proceeding, and no better surface or finish can be
obtained than in this way. No. 4 foil, folded up
to No. 128, viz., 32 thicknesses, or layers, of the
No. 4 foil, and cut into these small squares, can
be used for surface work with great satisfaction if
properly annealed.
Small pieces of foil torn from the sheet may be
used for filling minute cavities, or parts of cavities
(especially starting pits and fine grooves) that are difii-
cult of access. Pellets or cylinders have a wide range
of usefulness, but balls of gold foil will generally
be found too resistant to be accurately adapted and
condensed by the cohesive method. In using strips
or tapes of gold it is important they should not be
too thick. The building up of contours, and the
filling up of the middle of large fillings, may be
satisfactorily effected by means of strips containing
eight thicknesses of No. 4 foil, and ten thicknesses
and even sixteen thicknesses may be used for build-
ing up, but accurate adaptation and density is best
attained by confining oneself to four thicknesses of
either No. 4 or No. 5 foil, producing No. 16 with
the No. 4 foil and No. 20 with the No. 5 foil.
The writer has no desire to speak dogmatically on
this subject, but he distinctly deprecates the use of
thick tape against cavity walls, and believes that,
all things considered, the No. 16 strip is the best