Lithium disilicate (Li2Si2O5) is a chemical compound that is a glass ceramic.
It is widely used as a dental ceramic due to its strength, machinability and translucency.
Lithium disilicate has an unusual microstructure that consists of many randomly oriented small and interlocking plate-like needle-like crystals.
In addition, it can be made to have an appearance that very closely resembles that of natural human teeth.
Lithium disilicate is also used as a non-conductive seal, enamel or feed-through insulator in nickel superalloys or stainless steel, as it has a high thermal expansion.