Ivoclar Vivadent IPS Empress Esthetic - Manual (Page 38)

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Cut-back technique
Fabricate a silicone key to prepare the restorations for individualization with IPS Empress Esthetic Veneer. Subsequently, the
cut-back is carried out. The fully anatomically pressed veneers are reduced in the incisal third. For that purpose, use
ceramic-bonded grinding instruments or diamonds.
The following points must be observed:
– Too much pressure and excess heat development during grinding must be prevented.
– Refrain from designing too extreme mamelons with undercuts.
– Check the cut-back by means of the silicone key.
– The minimum wall thickness of the pressed IPS Empress Esthetic restorations of 0.5 mm must be observed.
Fabricate a silicone key before conducting the cut-back. Refrain from designing too extreme mamelons with undercuts.
Check the cut-back by means of the silicone key, observe the minimum
wall thickness of 0.5 mm. Limit the cut-back to the incisal third.
Blast the restoration with Al 2 O 3 (Type 100) at 0.5 bar pressure. Clean the restoration with steam prior to wash firing.
Preparing for veneering
Blast the outer surfaces of the ceramic restoration carefully with Al 2 O 3 (Type 100) at max. 0.5 bar pressure and clean
thoroughly with the steam jet. Before veneering, the restorations must be free of dirt and grease.