Current status on lithium disilicate and zirconia | 合法醫療器材資訊網

由FZarone著作·2019·被引用81次—Lithiumdisilicateceramicscanbeutilizedbothfortooth-andimplant-supportedrestorations,rangingfromSCstoFDPs,fromanteriorveneers ...

Lithium disilicate (LS2) is classified as a glass-ceramic, in the class of particle-filled glass materials. Introduced on the market in the 90s with the commercial formulation named “IPS Empress 2” (Ivoclar Vivadent, Schaan, Liechtenstein), it was composed of 65 vol% lithium disilicate, small needle-shaped crystals (3–6 μm × 0.8 μm) embedded in a glass matrix, with a 1 vol% porosity [1,2,3], showing valuable mechanical characteristics (flexural strength: 350 MPa; fracture toughness (KIC): 3.3 MPa√m; heat extrusion temperature: 920 °C; thermal expansion coefficient (CTE): 10.6 + 0.25 ppm/°C). At first, this material was made commercially available as ingots, to be utilized according to the “heat-pressing” fabrication procedure, similar to the classic “lost wax” technique for metal-alloy casts, aimed at producing cores, hot...