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FILLING TEETH 91

were occlusal cavities, for by means of a little
extension towards the lingual surface (or the labial
surface if necessary) plus a little separation, they
can usually bo prepared like occlusal cavities, and
tilled much in the same way, using, of course,
instruments sufficiently curved to reach them easily.
The first few pellets will generally be packed in the
direction of the labial or lingual wall—depending
on the opening.
Where both the labial and lingual walls of a cavity
are badly broken down, there is usually plenty of
room to work the gold partly from the front, and
partly from the back. It is impossible to prevent
the gold from showing, and cutting for access can
usually be freely done. In these cases the gold
must first be packed into as deep retainage, or
as broad retainage, as can safely be made at the
cervical wall, and a thick layer of gold made at this
part. It is then carried downwards over the floor
and to the cutting edge, and the contour built up
by working directly on to this mass. It is import-
ant in these cases for the gold to be thoroughly
cohesive, and w^orked with great care and solidity
into whatever grooves, undercuts, or angles, can with,
safety be made at the sides and cutting edge.
Molars and Bicuspids (approximo-occlusal cavities).
—To fill an approximal cavity in a molar or