Ivoclar Vivadent IPS Empress Esthetic - Manual (Page 22)

Waxed up posterior crown Waxed up inlays
Wax-up
Fabricate a fully anatomical, functional wax-up for the Esthetic technique. You can use any organic waxes that burn out
without leaving residue. Please observe the following notes for contouring:
– Observe the stipulated minimum wall thicknesses.
– Exact contouring of the restoration, particularly in the area of the preparation margins, is indispensable. Do not over-
contour, since this would require time-consuming and risky fitting procedures.
– Possible occlusal relief must be taken into consideration as early as during the wax-up, since the final firing of Shades,
Stains and Glaze also results in added surface dimension.
Sprueing
Always place the sprues in the direction of flow of the ceramic and at the thickest part of the wax-up in order to achieve
unimpeded flow of the viscous ceramic material. The 100-g or 200-g investment ring base is selected depending on the
number of objects to be invested and their wax weight.
The following guidelines are recommended to determine the proper wax weight:
– Weigh the IPS Empress investment 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 difference between the two values is the weight of the wax used.
– Remove excess separating material prior to investing.
The following sprueing guidelines must be observed:
Investment ring system
Wax wire ø
Wax wire length
Length wax wire including object
Sprueing angle to the wax object
Sprueing angle to the investment ring base
Design of the attachment points
Distance between objects
Distance to the silicone ring
Important
Inlays, onlays, veneers, single crowns
100 g
max. 1 ingot; max. 0.6 g wax weight
200 g
max. 2 ingots; up to max. 1.4 g wax weight
2.5 – 3 mm
min. 3 mm, max. 8 mm
max. 15 – 16 mm
axial
45–60°
rounded and slightly tapered; no sharp angles or edges
min. 3 mm
min. 10 mm
A dummy object must be invested with very small single
wax objects in order to activate the abort criterion of the
EP 500/EP 600/EP 600 Combi furnace.
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