Ivoclar Vivadent IPS e.max CAD Chairside v.1 - Handbuch (Seite 61)

9
Preparation Guidelines
Successful results can only be achieved with IPS e.max CAD if the guidelines and framework thicknesses are strictly
observed.
Basic preparation guidelines for all-ceramic restorations
– no angles or sharp edges
– shoulder preparation with rounded inner edges and/or chamfer preparation
– the indicated dimensions reflect the minimum thickness for IPS e.max CAD restorations
– 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.
1.0
1.5
0.6
0.6
0.7
1.0
1.0
1.5
1.2 1.2 1.0
– If possible, the preparation should be located in the
enamel.
– The incisal preparation margins should not be located
in the area of static or dynamic enamel contact.
– Reduction in the cervical and/or labial area by 0.6 mm,
and the incisal edge by 0.7 mm.
– Reduce the anatomical shape and observe the
stipulated minimum thickness. Prepare a shoulder with
rounded inner edges or a deep chamfer. Width of the
shoulder/chamfer at least 1.0 mm.
– Reduce the incisal edge by approx. 1.5 mm.
– Reduce the labial or lingual area by approx. 1.2 mm.
– For conventional and/or self-adhesive cementation,
the preparation must demonstrate retentive surfaces.
Veneers Anterior crown