Ivoclar-vivadent IPS e.max CAD-on User Manual download pdf (Page 15)

Preparation Guidelines

Basic preparation guidelines for all-ceramic restorations

– No angles or edges

– The incisal edge of the preparation, particularly for anterior teeth, should be at least 1.0 mm (milling

tool geometry) in order to permit optimum milling during CAD/CAM processing.

The following notes should also be observed when using the IPS e.max CAD-on technique:

The zirconium oxide framework is designed in the software with a circumferential collar on abutment

teeth / crown framework due to technical reasons. The height of this collar is mainly determined by the

shape of preparation and the designed fully anatomical tooth shape.

– A very pronounced shoulder/chamfer results in a thin zirconium oxide collar.

– A minor shoulder/chamfer results in a wider zirconium oxide collar.

1.0

1.5

A very pronounced shoulder/chamfer results in

a thin zirconium oxide collar.

A minor shoulder/chamfer results in a wider

zirconium oxide collar.

Clinical Working Steps, Model Fabrication

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Ivoclar-vivadent IPS e.max CAD-on User Manual Page 15