High strength and well-proven - for more than ten years
8 January 2019
More than 10 years of continuous quality tests show: In comparison to other CAD/CAM glass-ceramics, IPS e.max CAD has an unrivalled level of biaxial flexural strength of 530 MPa(a).
Due to its high flexural strength and fracture resistance, IPS e.max CAD lithium disilicate provides a wide range of additional possibilities in minimally invasive dentistry.
With full-contour crowns and occlusal veneers (table-tops), these values mean a layer thickness of only one millimetre is sufficient when adhesively cemented. In general, IPS e.max restorations can be cemented – depending on the indication – adhesively, self-adhesively(b) or conventionally(b).
A high flexural strength is of significant importance for restorations in stress-bearing areas. Flexural strength is calculated on the basis of the fracture load, or the force applied to a material just before it yields.
Fracture toughness [MPa · m1/2]
A high fracture toughness increases the ability to resist crack propagation. The higher the measured value, the better the long-term clinical performance.
Hill T, Tysowsky G. Fracture toughness, KIC, of five CAD/CAM glass-ceramics. AADR/CADR Annual Meeting: 1672, 2016
Similar results are shown in the publication by Randi et al. (2017): Both the biaxial strength levels and the fracture resistance values were significantly higher in the material IPS e.max CAD than any other tested materials.
Clinical data confirms success
IPS e.max has been scientifically supported from the very beginning. Many well-known experts from all over the world have contributed with their clinical studies to support an excellent data base. The lithium disilicate and the zirconium oxide both have an average survival rate of 96 percent each.
Studies to read
The IPS e.max Scientific Report summarizes all in-vivo and in-vitro test results. All the details of the study by Hill et al. (2016) and Randi et al. (2017) are also included in this report.
(a) Medium biaxial flexural strength for over 10 years, R&D Ivoclar Vivadent, Schaan, Liechtenstein
(b) With conventional IPS e.max CAD preparation methods for anterior and posterior crowns, 3-unit bridges up to 2nd premolar.
1 Mean biaxial flexural strength, measured over 10 years. R&D Ivoclar Vivadent, Schaan, Liechtenstein
2 Values according to manufacturer's data.
3 These brands are not registered trademarks of Ivoclar Vivadent AG.