Ivoclar Vivadent IPS e.max ZirPress - Manual (Page 29)

29
Divesting
After cooling to room temperature (approximately 60-90 minutes), the investment ring
may show cracks which developed during the cooling phase (immediately around the
Alox plunger) as a result of the different CTEs of the various materials (Alox plunger,
investment material, ZirPress ingot). They do not compromise the press results in any way.
Divest the investment ring as follows:
– Mark the length of the plunger on the cooled investment ring.
– Separate the investment ring using a separating disk. Observe the marks on the invest-
ment ring regarding the position of the restoration. This predetermined breaking point
enables reliable separation of the investment material and the ceramic material.
– Break the investment ring at the predetermined breaking point using a plaster knife.
– Always use polishing beads to divest the pressed objects (rough and fine divestment).
– Rough divestment is carried out with polishing beads at 4 bar (60 psi) pressure.
– Fine divestment is carried out with polishing beads at 2 bar (30 psi) pressure.
– Do not use Al
2
O
3
for rough and fine divestment.
– Observe the blasting direction and distance to prevent damage to the object margins
during divestment.
– Remove possible ceramic residue at the Alox plunger with Type 100 Al
2
O
3
.
Mark the length of the Alox plunger.
Separate the Investment Ring System 200 g including the One-Way Plunger at the marking using a separating disk.
With the Investment Ring Systems 100 g and 200 g, separate the investment ring at the marking at the height of the Alox plunger.
Rough divesting with polishing jet medium at 4 bar pressure until the objects become visible. Use 2 bar pressure for fine divesting.
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Tip
For long-span restorations, it is recommended to cut the sprues while the restoration is still in
the investment ring in order to relieve tensions before final divestment. Make sure not to
damage the restoration when cutting the various sprues.