Page 75 - My FlipBook

FILLING TEETH —
59
being in these cases relied on for retention of the
cohesive top. In approximal cavities in incisors
and canines the cohesive portion depends for its
retainage on an interlocking attachment to the non-
cohesive gold.
In occlusal cavities an interlocking is also gener-
ally resorted to, but the writer considers, generally
speaking, that combination fillings in these cases
—apart from merely starting the cohesive gold
are unnecessary, and that either cohesive or non-
cohesive fillings are better. The method of inter-
lockino^ cohesive ffold into non-cohesive, that is
useful in incisors and canines, may, however, be
applied to occlusal cases if desired. In ap-
proximal cavities in incisors and canines the filling
may be made in the usual non-cohesive way, as
far as laterally packing the gold and forcing holes
in it with the wedge is concerned. Instead, how-
ever, of filling up the wedge - made holes with
non-cohesive gold, they should be filled with small
pieces of cohesive gold. This brings it about that
the filling is a non-cohesive one, with a number of
rods or nails of cohesive gold thoroughly and deeply
driven into it. The ends of these rods will be a
number of studs so dotted over the surface that
one or more layers of cohesive gold may be readily
and securely attached to them, and, especially if