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Lithium disilicate glass-ceramic materials are a type of glass-ceramic
materials which have major composition in the Li2O-2SiO2 system. Recent
studies on compositional modifications of the lithium disilicate precursor
glasses have yielded translucent glass-ceramics that are characterized by
high strength, excellent chemical durability, and aesthetic appearance of
natural teeth. That’s why this type of materials is preferred as dental
applications such as veneers, crowns, bridges and implants.
In recent years, the glasses prepared using a sol–gel route are found to
have advantages over conventional glass meltings method such as: better
homogeneity, higher level of purity, lower stoichiometric losses and less
contamination from crucibles.
In the present study, a crystalline lithium disilicate (Li2Si2O5) phase was
prepared from tetraethylorthosilicate (TEOS) and lithium nitrate (LiNO3)
with addition of triethyl phosphate (TEP) and Ca(NO3 )2. 4H2O mixture
with the help of the described sol–gel process.
Lithium disilicate glass–ceramics materials were prepared having a varying
content of Li2O (5, 10, 15 and 33.3 mol %). Results of the XRD analysis
obtained from the samples were revealed that only the 33 %
Li2O containing sample showed clearly the formation of lithium
metasilicate and lithium disilicate phases.