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Wax up the bridge framework and
create a cylindrical channel for
the later retaining screw by using
the wax-up screw. Adequately
dimensioned interdental spaces
should be ensured. If the wax-up
copings are bonded with synthetic
material, they must be roughened
beforehand.
Invest the wax-up as usual. Too
small an investment compound
expansion should not be selected
in this process, in order to avoid a
frictional fit.
After molding, devesting and
abrasion, the framework is fitted on
the model where the occlusion is
simultaneously checked.
The screw seating can be
occlusally reworked for the taper
with the Ankylos finisher.
The wax-up screw is used to
protect the screw channel while
the ceramic material is applied.
The completed suprastructure is
sent to the practice for delivery.
Where crowns or bridges are
occlusally screw-retained, the
screw holes are covered with wax
or gutta-percha and sealed with
composite after incorporation.