Ivoclar Vivadent IPS Empress CAD Labside - Manual (Page 22)

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The 2-in-1 technique is suitable for efficient glazing and staining of inlays, onlays, and partial crowns. In this technique, the
glaze and stain firing is conducted in one single step. This technique does not permit as many shade adjustments as a
separate stain firing. If more intensive and extensive shade adjustments are desired, we recommend conducting a separate
stain and characterization firing (as described in the following chapter).
IPS Empress CAD Inlays / Onlays – stained/glazed
Please refer to the corresponding Operating Instructions and/or Manuals of the respective CAD/CAM system
for further information on the CAD/CAM processing procedure. The instructions by the manufacturer must be
observed.
Finishing and preparing for stain and glaze firing
For finishing glass-ceramics, appropriate grinding instruments are indispensable. If the
wrong grinding instruments are used, marginal chipping and local overheating my occur.
The following procedure is recommended for finishing IPS Empress CAD restorations:
– Use only suitable, fine-grained (grain size < 60 µm), ceramic-bonded grinding instruments
or diamonds at a speed of up to 20,000 rpm and little pressure.
– Overheating the glass-ceramic must be prevented.
– Smooth out attachment point of the holder and take the proximal contact points into
account.
– Carry out individual shape adjustments, if required.
Before the stain and glaze firing, the restorations must be free of dirt and grease. Avoid any
contamination after cleaning. Observe the following procedure.
– Clean the restoration with ultrasound in a water bath or blast with Al 2 O 3 at 0.5 bar
pressure (Caution: abrasive) and clean under running water or using the steam jet.
– Certain blasting devices require different settings for the intended blasting procedure.
2-in-1 Technique – Stain and glaze firing using IPS Empress Universal
Once the restoration has been cleaned, apply the stains and glazing material in 2 steps. First, the glazing paste is applied,
followed by the stains, which are applied on the unfired glaze layer. The following working procedure should be observed.
Step 1 – Application of the glazing material
– Extrude IPS Empress Universal Glazing Paste from the syringe and mix thoroughly.
– Thin the material to the desired consistency using IPS Empress Universal Glaze and Stain Liquid. Do not excessively dilute
the material, since this may render the glazing procedure difficult to control.
– Apply the glazing material on the entire outer surfaces of the restoration.
– The glazing material must not come into contact with the inner aspects of the restoration.
– Avoid pooling and excessively thick glazing material layers.
– Too thin glazing material layers result in an unsatisfactory gloss.
Fabrication of an IPS Empress CAD Restoration
Clean the restoration before staining.
Smooth out attachment point and take proximal contacts into account.