Ivoclar Vivadent PS Empress CAD Chairside - Manual (Page 4)

4
Empress
®
CAD
Product Information
IPS
Material
IPS Empress CAD is used for the fabrication of highly esthetic,
full-contour single-tooth 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 structure. Subsequently, the restorations may be stained
using IPS Empress Universal and/or individually 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
Chem. resistance [µg/cm 2 ]* 25
Classification: Ceramic Materials Type II / Class 2a
*according to ISO 6872
More information about the authorized CAD/CAM systems is available on the Internet from www.ivoclarvivadent.com.