Ivoclar Vivadent IPS d.SIGN - Manual (Page 30)

30
When conditioning the frameworks, the instructions
of the alloy manufacturer must be observed at all
times. Oxidation is carried out according to the
instructions of the alloy manufacturer.
Use only disposable, pure Al
2
O
3
to blast the alloy
surface. Observe the Instructions for Use of the
corresponding alloy manufacturer.
Oxide firing
After grinding, carefully blast the framework with type
80–100 aluminium oxide (Al
2
O
3
). (Ivoclar Vivadent special jet
medium). When using IPS d.SIGN alloys, the required
pressure is 1.5–2.0 bar.
Blasting improves the mechanical bond. It results in the
object surface being roughened and considerably enlarged.
In order to prevent inclusions of blasting medium residue in
the ceramic, we recommend blasting the alloys with the
indicated pressure while keeping the nozzle at a flat angle to
the object surface. A contaminated metal surface may result
in the formation of bubbles during ceramic firing.
Before the oxidation firing, clean the metal framework using
a brush under running water. Then, thoroughly clean it with
steam or in the ultrasonic cleaner. Allow the framework to
dry after cleaning. Oxidize the framework according to the
instructions given by the alloy manufacturer. Provide ample
support for the framework on the firing tray. This is
particularly important for long-span bridges. After oxidation,
carefully check the framework for porosity or irregular oxide
layer. Applied corrections if necessary.
Correctly oxidized IPS d.SIGN alloys
Firing parameters for the oxide firing of IPS d.SIGN 98
T
925°C
1697°F
B
403°C
757°F
S
1 min.
1 min.
t
80°C
144°F
H
5 min.
5 min.
V
1
–
–
V
2
–
–
➚
Firing parameters for the oxide firing of IPS d.SIGN 96
T
950°C
1742°F
B
403°C
757°F
S
1 min.
1 min.
t
80°C
144°F
H
5 min.
5 min.
V
1
450°C
842°F
V
2
950°C
1742°F
➚
Schematic diagram of the
blasting direction
Correct angle for blasting the
alloy surface.
... and oxidized according to the instructions of the alloy manufacturer.
... thoroughly cleaned, ...
After grinding, the framework is carefully blasted with type 100 aluminium oxide Al 2 O 3 ,….