Ivoclar Vivadent IPS e.max CAD Labside - Manual (Page 57)

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When should manual adjustments with
grinding instruments be done?
All grinding adjustments of milled IPS e.max CAD
restorations should be made in the pre-crystallized
(blue) state. It is important to note that the frame-
work in its pre-crystallized state should be ground
only with suitable grinding instruments, low rpms
and light pressure to prevent delamination and
chipping, particularly at the margins.
Do IPS e.max CAD restorations require
occlusal adjustment after the CAD/CAM
process?
Yes. Surface-grind the outer surface, particularly
functional areas with antagonist
contact, with a fine diamond to
smooth out the surface structure
created by the CAD/CAM process.
Can machined IPS e.max CAD
restorations in the pre-crystal-
lized (blue) state be completely finished and
then crystallized and veneered?
Milled IPS e.max CAD restorations can be tried in
on the die and all areas fully finished in the pre-
crystallized (blue) state.
Thin margins only after crystallization (silicone
polishers), since margins that are too thin tend to
round during crystallization.
Do IPS e.max CAD restorations shrink during
crystallization?
No. During the crystallization process, the micro-
structure becomes transformed and a densifica-
tion of 0.2 % takes place. The milling software
takes the densification factor into account.
Therefore, the milled IPS e.max CAD restorations
demonstrate precision of fit after crystallization.
No further manual adjustments are necessary.
Why does the auxiliary firing paste IPS Object
Fix Putty or Flow have to be used during the
crystallization process?
In order to prevent distortion of the IPS e.max
CAD restoration during crystallization, IPS Object
Fix Putty or Flow are used. They support the
restoration in an optimum manner and thus
ensure exact accuracy of fit after crystallization.
Smaller restorations may be placed directly on the
IPS e.max CAD Crystallization Pin with a small
amount of IPS Object Fix Flow.
Can firing pastes other than IPS Object Fix
Putty or Flow be used in the crystallization
process?
IPS Object Fix Putty and Flow has been specially
developed for the crystallization of IPS e.max CAD
restorations. The expansion behaviour has been
optimally coordinated with IPS e.max CAD. In
other words, the consistency before and after the
crystallization allows the paste to be easily applied
and cleanly removed. Given their composition,
pastes of other manufacturers may cause damage
to IPS e.max CAD. Furthermore, easy removal may
not always be possible.
How are contaminations with IPS Object Fix
Putty or Flow on the outer surface of the
restorations best removed before
crystallization?
A short-hair brush or cotton swab dampened with
water can be used for cleaning. It must be made
sure that any residue has been removed before
Shades, Stains or Glaze are applied in order to
prevent the residue from being burned in.