In dentistry, silicate ceramics with varying amounts of glass are distinguished from oxide ceramics with little or no glass content. In an ideal glass, there are no crystalline structural elements like in ceramics. The higher and finer the arrangement of the crystalline structure, the less light can pass through the ceramic (Fig. 1); the opaquer it appears. Schlagwörter: feldspathic ceramic, leucite ceramic, lithium disilicate, lithium silicate, methods, milling, pressing, printing, silicate ceramics, technological processing, zirconium