WissenschaftPages 490-499, Language: German, EnglishRosentritt, Martin / Rauch, Angelika / Schmidt, Michael / Hahnel, SebastianThe mechanical and optical properties of zirconia restorations can be negatively influenced by improper handling, inadequate design or careless nesting positioning in the blank. Knowledge and careful execution of the milling and especially the sintering procedures form a decisive basis for ensuring the quality of a dental restoration.