Ivoclar Vivadent IPS Empress Esthetic Clinical - Manual (Page 9)

9
Preparation
Full crowns
Anterior and posterior crowns
Evenly reduce the anatomical form, observing the stipulated minimum wall thickness. Prepare
a circular shoulder with rounded internal angles or a chamfer. The width of the circular
shoulder/chamfer should be approx. 1 mm. Reduce the axial walls of the tooth on the incisal
third of the crown by approx. 1.5 mm. The incisal and/or occlusal reduction should be
approx. 2 mm.
Veneers
If possible, the preparation should be entirely located within the enamel. Two techniques are
available: the first involving a simple incisal reduction without reduction of the incisal edge
and the other a classic preparation with lingual-incisal, chamfer-like preparation of the incisal
edge. Margins should not be located in the occlusal contact areas.
The dimension of the incisal reduction depends on the desired degree of translucency of the
incisal area to be restored. The more transparent the incisal edge of the veneer should
appear, the more reduction is required. An incisal reduction of at least 1 mm is recommended.
By providing depth grooves using the appropriate burs, controlled enamel reduction can be
achieved. The minimum preparation thickness is approx. 0.6 – 1 mm depending on the
preparation technique chosen. Eliminating proximal contacts is not necessarily required.
Discoloured teeth may require more extensive reduction to allow for adequate masking.
A cervical chamfer should be prepared.
OR
Dimensions in mm
Dimensions in mm