Ivoclar Vivadent IPS e.max CAD Labside - Manual (Page 35)

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Cut-Back Technique
IP
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In the cut-back technique, IPS e.max Ceram Impulse and Incisal materials are applied in the incisal and/or
occlusal area of the milled, reduced IPS e.max CAD. Subsequently, the Stain and Glaze firing is conducted.
The limited application of layering material permits achieving highly esthetic restoration in an efficient man-
ner.
Finishing and Preparation for Crystallization
It is of critical importance to use the correct grinding instruments for finishing IPS e.max CAD. If unsuitable grinding
instruments are used, chipping of the edges and local overheating may occur (please observe the Ivoclar Vivadent Flow
Chart ”Recommended grinding tools for PS e.max glass-ceramics”.
Observe the following procedure for finishing IPS e.max CAD restorations:
– Carry out adjustments by grinding of IPS e.max CAD restorations while they are still in their pre-crystallized (blue) state,
whenever possible.
– Only use suitable grinding instruments, low rpms and light pressure to prevent delamination and chipping at the edges
in particular.
– Overheating of the glass-ceramic must be avoided.
– The restorations are tried in on the dies and carefully finished.
– Depending on the type of reduction, check contact points and occlusion and adjust by grinding in accordance with the
given clinical situation.
– Make sure that the minimum thicknesses are maintained even after the minor adjustments.
– Refrain from designing extreme morphologies with undercuts for mamelons.
– Always clean the restoration with ultrasound in a water bath or blast with the steam jet before crystallization.
– Do not blast the framework with Al
2
O
3
or glass polishing beads.
Try in the milled restoration on the model.
Tooth 11: anterior crown with cut-back
Tooth 21: fully anatomical veneer Make sure that the minimum layer thickness of the restoration is maintained during finishing
Finish the restoration surface with suitable grinding instruments Refrain from designing extreme morphologies with undercuts for mamelons