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As digital impression scanning, computer-assisted design (CAD), and computer-assisted milling (CAM) are becoming more commonplace in dentistry, the use of high-strength ceramics, such as lithium disilicate and zirconia, are quickly becoming the main laboratory-fabricated restorative choices for many dentists. Lithium disilicate can be a very aesthetic material for both anterior and posterior full- and partial-coverage restorations, as it also exhibits higher strength and fracture toughness over conventional feldspathic and leucite-reinforced ceramics.
High-translucency (HT) ingots have improved the aesthetic quality but cannot always mask the color of a dark preparation. Zirconium oxide restorative materials got their start as tooth-colored replacements for traditional full-gold crowns on posterior teeth. Conservative posterior tooth preparations, similar to prep designs for gold, could be done because of the high strength of the material. However, early zirconia materials were very opaque and only indicated for first or second molars.Read More