Ivoclar Vivadent IPS e.max ZirPress - Manual (Page 10)

10
Preparation Guidelines
Successful results can only be achieved with IPS e.max ZirPress/ZirCAD if the guidelines and layer 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 restorations
– the radius of the preparation edges, 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
1.2
1.0
1.2
1.5
1.0
1.2
1.5
1.0 1.0
1.2
1.5
1.2
6°
1.0
– Evenly reduce the anatomical shape and observe the stipulated minimum thickness. prepare a circular shoulder
with rounded inner edges or a chamfer of a width of at least 1.0 mm.
– Reduce the incisal crown third – incisal and/or occlusal – by approx. 1.5 mm.
– For anterior crowns, the reduction in the labial and/or palatal/lingual area is at least 1.2 mm. The incisal edge of
the preparation should be at least 1.0 mm (milling tool geometry) in order to permit optimum milling of the
incisal area during CAD/CAM processing.
– For posterior crowns, the reduction in the buccal and/or palatal/lingual area is at least 1.2 mm.
– For conventional and/or self-adhesive cementation, the preparation must demonstrate retentive surfaces.
Single Crowns to 3-Unit Bridges