Ivoclar Vivadent IPS e.max CAD-on - Manual (Page 15)

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
W
orking
Steps,
Model
Fabrication