* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project
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.