Ivoclar Vivadent IPS e.max CAD Chairside v.1 - Handbuch (Seite 56)

4
e.max
®
CAD
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Product Information
IPS
Material
IPS e.max CAD is a lithium disilicate glass-ceramic block for the
CAD/CAM technique. It is fabricated using an innovative process
which provides an impressive homogeneity of the material.
The block can be processed very easily in a CAD/CAM unit in its pre-
crystallized (“blue”) state. The typical and striking colour of the pre-
crystallized IPS e.max CAD blocks ranges from whitish to blue and
bluish-grey. The shade is a result of the composition and the
microstructure of the glass-ceramic. The strength of the material is
130 to 150 MPa and thus comparable to other glass-ceramic blocks
currently available on the market. After the IPS e.max CAD blocks
are milled, the restoration is crystallized in an Ivoclar Vivadent
ceramic furnace (e.g. Programat ® CS). Contrary to some other
CAD/CAM ceramics, the crystallization process does not lead to
significant shrinking and does not require time-consuming infiltra-
tion processes. Crystallization is completed after approx. 20 t o
25 minutes. The crystallization at a temperature of 840°C (1544°F)
causes a transformation of the microstructure, during which lithium
disilicate crystals grow in a controlled manner. The densification of
0.2% is accounted for in the CAD software and taken into account
upon milling. The key physical parameters, such as the strength of
360 MPa and the corresponding optical properties, are achieved
through the transformation of the microstructure.
IPS e.max CAD blocks show a natural brightness. Due to the
translucency and shade variety, fully anatomical restorations can
easily be fabricated with this glass-ceramic.
CTE (100 - 400°C) [10 -6 /K] 10.2
CTE (100 -500°C) [10 -6 /K] 10.5
Flexural strength (biaxial) [MPa]* 360
Fracture toughness [MPa m 0.5 ] 2.25
Modulus of elasticity [GPa] 95
Vickers hardness [MPa] 5800
Chem. solubility [µg/cm 2 ]* 40
Crystallization temperature [°C/°F] 840/1544
*according to ISO 6872