Ivoclar Vivadent IPS e.max Ceram - Manual (Page 63)

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How are the IPS e.max Ceram Add-On materials correctly
used?
There are 3 Add-On materials available for final adjustments. Add-
On Margin with a firing temperature of 725 °C (1337 °F) is used for
shoulder adjustments with the dentin / incisal firings as well as with
the final glaze firing. Depending on the application, the Add-On
Margin material is mixed 1:1 with the correspondingly shaded
Margin material (adjustment with the dentin/incisal firing) or used
alone (adjustment with the glaze firing). Add-On Dentin and Add-
On Incisal with a firing temperature of 700 °C (1292 °F) are used to
supplement missing areas (e.g. contact points) with the final glaze
firing or a separate add-on firing after glaze firing.
Depending on the application Add-On Dentin and Add-On Incisal
are mixed 1:1 with the Dentin and Incisal material in the
corresponding shade (supplements with the glaze firing) or used
alone (supplements after glaze firing) (see also page 33).
How should completely layered IPS e.max Ceram restorations
be prepared for firing?
Separate the completely layered IPS e.max Ceram restorations in the
interdental area down to the framework and only blot them dry
with a cloth. Excessive vibration of the restorations by drawing
another instrument over the grooves of the forceps grip and using
suction equipment or excessive drying with blown air should not be
done.
How can the shrinkage be compensated for deep occlusal
preparations or very concave areas?
With deep occlusal surfaces and/or steep cusp inclinations and
particularly with massive zirconium oxide pontics and abutments, it
is favourable to separate the central fissure with a scalpel down to
the framework before the first firing (with the ZirLiner layer already
fired). In this way, the ceramic may sinter to the framework surface
in a controlled fashion. During the subsequent 2 nd Dentin and
Incisal firing, the central fissure and occlusal surface are then
closed.
How can the shrinkage of the ceramic be reduced, especially
in large bridges and implant superstructures?
If enough space is available, a special Deep Dentin or intermediate
Dentin firing is recommended, to distribute the overall shrinkage to
two firing procedures. In this way, especially the position of the
Impulse materials after the second firing can be ensured.
What liquid should be used to rewet IPS e.max Ceram
layering materials?
If a layering material has to be rewetted on the mixing pad, distilled
water has to be used for that purpose. No Build-Up Liquids must be
used, since this would result in an accumulation of organic
components, which may lead to gray discolouration of the
veneer as they fail to fire without leaving residue.
How can the wetting properties of the restoration be
improved before the Stain and Glaze firing?
The wetting properties of the surface can either be improved by
slight blasting with Al 2 O 3 (Type 100 µm/ max. 1 bar/15 psi) or by
rubbing with moist ceramic powder or pumice. Good wetting
properties are important for a homogeneous application of the
Shades, Essence and Glaze materials.