Ivoclar Vivadent IPS e.max Press Abutment Solutions v.2 - Manual (Page 50)

50
e.max
®
Press
Abutment Solutions
General Information
IPS
Frequently Asked Questions
In addition to the desired tooth shade, why
should the root shade also be defined/
determined upon shade determination?
IPS e.max Press Abutment Solutions allow you to
fabricate restorations with a lifelike appearance
both in the visible area and the area below the
gingiva (root). By defining the root shade, a highly
esthetic outcome can be achieved especially
receding gingiva.
Is it possible to fabricate an abutment or an
abutment crown with IPS e.max Press (LS
2
)
without using a Ti base?
No! For this indication, IPS e.max Press needs the
support provided by the Ti base. In addition, the Ti
base allows an optimum (industrially fabricated) fit
to the implant to be achieved.
Is it possible to use any commercially
available Ti base in conjunction with
IPS e.max Press Abutment Solutions?
When selecting a suitable Ti base, the requirements
in terms of minimum dimensions (height, shoulder
width, no undercuts) must be taken into account.
In addition, the Ti base must be equipped with a
rotation lock which does not entail a reduction of
the ceramic layer thickness.
Is it permissible to modify the selected
Ti base?
The instructions of the manufacturer with regard
to modifying the Ti base must be observed. Prior
to permanent cementation, the bonding surface of
the Ti base must be blasted with Al
2
O
3
.
Is a hybrid abutment crown indicated in the
anterior region?
This indication depends on the position and incli-
nation of the implant. If the opening of the screw
channel is located on the lingual/palatinal surface,
a hybrid abutment crown may be fabricated in the
anterior region.
Is it possible to use an IPS e.max Press hybrid
abutment as an abutment for a bridge
restoration?
No. Only single-tooth restorations may be
fabricated.
What do I need to take into consideration
when designing a hybrid abutment or hybrid
abutment crown in order to fabricate a
durable restoration?
The stipulated minimum and maximum layer thick-
nesses for IPS e.max Press need to be observed. In
addition, the ratio between the height of the Ti
base and the height of the entire restoration must
be observed.
What do I need to take into consideration
when attaching sprues and investing the
wax-up?
The screw channel of the sprued wax-up must be
parallel to the outer wall of the investment ring.
As a result, the investment material can be filled
evenly and in a controlled manner. In addition, the
risk that the flowing ceramic material could break
off the investment material in the screw channel is
reduced. The objects could be placed in a tilted
position on the investment ring base, but this may
lead to difficulties during investing (e.g. bubbles in
the screw channel).
If the screw channel is very long, the investment
material in the screw channel can be stabilized
with a pin (e.g. high-grade steel, ZrO
2
) during
investing. For this purpose, pour investment
material into the investment ring up to the
restoration margin, insert the pin into the screw
channel and fill up the investment ring up to the
marking without vibrating it.
When is the sprue of the pressed object
separated?
We recommend that the pressed objects should
be fitted to the Ti base first, as this facilitates the
handling. Subsequently, the pressed objects are
separated from the sprue.