IPS e.max CAD produced higher flexural strength and fracture toughness values than the other materials investigated.
High flexural strength is essential for occlusal stress bearing restorations. The excellent clinical longevity and high flexural strength of IPS e.max CAD allow the fabrication of fullcontour crowns of only 1 mm thickness, which then are placed using the adhesive cementation method. A high fracture toughness increases the ability to resist crack propagation. The higher the measured value, the better the long-term clinical performance.
IPS e.max CAD produced the highest biaxial flexural strength and fracture toughness of the materials investigated and, with a value of 2.247, it exceeded the recommendation of the ISO standard for a minimum fracture toughness of 2.0. The materials were tested according to ISO standard 6872:2015.
Randi W, Randi A, Hill T. (2017). Evaluation of biaxial flexural strength and fracture toughness of a zirconia-reinforced dental ceramic. 47th Annual Session of the American College of Prosthodontists.