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58 THE TREATMENT OF TEETH
lingual, and cervico labial, or buccal, angles), and
then forcing the cohesive into these pits.
It is important to begin attaching the cohesive
gold before the non- cohesive is much condensed.
As soon as it is wedged to place, and sufficiently
firmly pressed to prevent dislodgment, the cohesive
should be applied, and the condensation of the
cohesive layer will then fully condense the non-
cohesive, and drive it into close contact with the
wall.
In an occlusal cavity, or in a small round or oblong
approximal cavity that can be filled by force applied
at right angles to the floor, a base of non-cohesive
may be wedged between the Avails, and pressed
down on to the floor. The deeply serrated plugger,
or the forcing of a few pits into the base, will enable
the cohesive gold to be easily added. The making
of combined fillings of non -cohesive and cohesive
gold presupposes the use of much more non-cohesive
gold than is employed for merely starting the filling.
This method is resorted to mainly for purposes of
convenience and rapidity. In approximo-occlusal
cavities of molars and bicuspids, the non-cohesive
is used up to the knuckle, and the cohesive
completion, or top, is securely locked into the rest
of the cavity ; no question of mechanical attach-
ment of the cohesive to the non-cohesive portion