Page 200 - My FlipBook

1 84 THE TREATMENT OF TEETH

ence between the appearance of an inlay when the
lip is lifted up and it is closely inspected, and its
appearance at a greater distance, with all the
lights and shadows playing on it momentarily,
varying with the movements of the lips. Careful
blending of the various shades will give an artist an
advantage over a merely skilful workman, and it
may be suggested that the use of two or more
shades fused in separate layers, one over the other,
may give better results in some cases than a mixing
together of the shades before fusing. The removal
of the matrix from the porcelain is usually easily
effected. The small, straight Boley pliers or tweezers
are very useful for stripping off the gold. The
straight points enable a good broad grip to be
obtained at the edge, and the gold or platinum is
then gradually and satisfactorily turned back from
the margins, until it generally comes off in one
piece. A slight feather edge will often be found on
the inlay. This is easily removed with a partly worn
fine cut plug trimming file (a Smith's disc), or it may
be rubbed off with one of the small engine stones
(a " Gem Cavity Trimmer ") held in the hand.
Some operators use either a small stone, or a
sandpaper or cuttle-fish disc in the engine. It is
safer to use a hand instrument, to avoid removing
any of the true margin.