The study by K. A. Malament shows: Of all the glass-ceramics evaluated, IPS e.max CAD / Press performed the best, with a survival rate of 99.75 per cent during an observation period of just over ten years.
In this investigation 6000 all-ceramic restorations were examined. The first restorations were placed in 1983. Four different types of ceramics are described in the study:
Dicor/Dentsply Sirona (n = 1504)
In-Ceram/Vita (n = 330)
IPS Empress (n = 2133)
IPS e.max Press or CAD (n = 2364)
Records for Dicor have been kept since 1983, for In-Ceram since 1990, for IPS Empress since 1992 and for IPS e.max since 2005.
Surpassed expectations Despite the shortest observation period of just over ten years (128 months), lithium disilicate restorations made of IPS e.max Press and IPS e.max CAD showed the highest survival rate of 99.75 % in this large scale survey. According to K. A. Malament the materials fulfilled and even surpassed all the clinical practice requirements.