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FILLING WITH GOLD. 103

required for cohesive gold, which is somewhat difficult to mas-
ter, and it can not be used for contouring or even in filling to
form in cavities that have lost one or more of the surrounding
walls ; for in this manner of filling the principle of wedging the
gold between the surrounding walls is depended upon to retain
the gold. For this purpose only foil is used and its lamina must
extend from the floor to the surface of the cavity. Either the
form of the rope or cylinders may be used. In this form of fill-
ing the gold is not annealed. With our present ideas of pre-
paring cavities, only occlusal and buccal or labial ca\ ities that
have complete and good surrounding walls would be suitable for
non-cohesive gold work. The forms in which we now prepare
these are as suitable for non-cohesive as for cohesive gold, only
that no convenience points for starting the filling are required
for non-cohesive gold.
In filling an occlusal ca\ity in a molar with non-cohesive gold
cylinders we would prepare these so that the length of the cylin-
ders should be a litde greater than the depth of the cavity.
Some should be large and some small, the size of the larger ones
depending upon the size of the cavity. Begin with the cylinder
which, as loosely rolled, would about fill the cavity full. Set this
in the cavity with one of its ends standing upon the pulpal wall
and the other protruding from its orifice. Now, with the side
of a large plugger press the cylinder against the distal wall. Set
another cylinder in in the same way and condense it against the
first. Repeat this by adding cylinder after cylinder until the
distal half or more of the cavity is filled. Then continue by
condensing the cylinders against the mesial wall, and in turn the
buccal and lingual walls, all the time using the lateral pressure
with the side of the plugger point, not with its end. As the work
progresses and the cavity room is narrowed, the cylinders intro-
duced must be smaller and smaller. Finally, to obtain room for
additional cylinders, a sharp point of a wedge form must be
pressed to the floor of the cavity and with a prying motion the
gold is wedged against the cavity walls in every direction with
great force. The space thus gained is again filled with small
cylinders and the wedging repeated so long as it is possible to
force in another cylinder. The small cylinders last introduced
should be rolled very hard. When it is no longer possible to
force another cylinder into the central portion of the cavity,