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IPS e.max CAD and IPS e.max Press (Ivoclar Vivadent AG) are lithium disilicate glass ceramics marketed as interchangeable materials indicated for the same clinical uses. However, different crystal sizes of lithium disilicate are formed during the processing of each of these materials, a factor that could lead to significantly different mechanical properties. As mechanical failure is always associated with a crack-initiation/crack-propagation process, fracture toughness (K_IC) values could be useful in comparing different ceramics and possibly predicting clinical performance.

The purpose of this in vitro study was to determine and compare the K_IC of IPS e.max CAD and IPS e.max Press.

The notchless triangular prism (NTP) specimen K_IC test was used to determine and compare the K_IC of IPS e.max Press and IPS e.max CAD. Twenty 6×6×6×12-mm NTP specimens of …