Ivoclar Vivadent IPS e.max ZirPress - Manual (Page 60)

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Design the restoration to full anatomical contour for the staining technique so that is only requires glazing and, if necessary,
characterization after pressing.
Please note: The screw cavity must be accessible after pressing. For that purpose, a placeholder (e.g. plastic tube) is inserted
into the screw cavity before contouring.
Fully anatomical wax-up made of organic wax on the IPS e.max Abutment. Observe the minimum and maximum layer thicknesses!
Seal the screw cavity with a placeholder (e.g. plastic tube).
Sprueing
Please observe the following procedure to sprue the wax-up:
– Always attach the sprues in the direction of flow of the ceramic and at the thickest part of the wax-up so that smooth
flowing of the viscous ceramic during pressing is enabled.
– Carefully remove the placeholder from the screw cavity.
– Loosen the screw and remove the abutment from the model
– Secure the sprued abutment with wax on the selected ring base
– For further notes on sprueing, see pages 21ff.
We recommend the following procedure to determine the accurate wax weight:
– Weigh the IPS ring base (seal the opening of the ring base with wax)
– Position the objects to be pressed on the ring base and attach them with wax. Weigh
again.
– The wax weight is calculated by deducting the weight of the ring base and the weight
of the abutment from the total weight.
– Use the respective number of ingots for the calculated wax weight.
Important: Areas not to be pressed over (screw cavity, implant connector) must be free of wax in order not to
compromise the accuracy of fit!