Ivoclar Vivadent IPS Empress CAD Labside - Manual (Page 4)

4
Empress CAD –
Product Information
IPS
Material
IPS Empress CAD is used for the fabrication of highly aesthetic, fully
anatomical single-unit restorations by means of the CAD/CAM
technology.
IPS Empress CAD blocks are made of a leucite-reinforced glass-
ceramic which consists of a glass and a crystal phase. Leucite
crystals of few microns evenly grow in a multi-stage process directly
from the amorphous glass phase. During the fabrication of the
blocks, the semi-finished product in powder form is pressed to
blocks in a fully automated procedure, which enables a maximum of
homogeneity. Given the difference in the coefficients of thermal
expansion (CTE) between the glass phase and the crystal phase
(leucite), cooling after sintering produces compressive stress in the
glass phase. This mechanism results in an increase in strength and
enables IPS Empress CAD to achieve a flexural strength of 160 MPa.
This type of material has been successful, as well as proven. for
almost 20 years. The milled restorations feature
excellent accuracy of fit and a homogeneous surface. Subsequently,
the restorations may be stained using IPS Empress Universal Stains
and/or veneered using IPS Empress Esthetic Veneer.
CTE (100–400°C) [10 -6 /K] 16.6
CTE (100–500°C) [10 -6 /K] 17.5
Flexural strength (biaxial) [MPa]* 160
Fracture toughness [MPa m 0.5 ] 1.3
Vickers hardness [MPa] 6200
Chemical resistance [µg/cm 2 ]* 25
*according to ISO 6872