| 摘要 |
Ceramic restauration comprises a glass ceramic containing (in wt.%) 40-95 SiO2, 5-25 Al2O3, 5-25 K2O, 0-25 Na2O, 0-20 CaO, 0-8 B2O3, 0-0.5 P2O5 and 0-3 F. The ceramic additionally contains 20-45 wt.% leucite as single crystal phase. The ceramic restauration has a linear heat expansion coefficient alpha (20-500oC) of 12.5 - 15.5 x 10<-6> K<-1>. An Independent claim is also included for a process for the production of a ceramic restauration based on leucite-containing glass ceramic comprising: (a) producing a starting glass or glass ceramic containing (in wt.%) 40-95 SiO2, 5-25 Al2O3, 5-25 K2O, 0-25 Na2O, 0-20 CaO, 0-8 B2O3, 0-0.5 P2O5 and 0-3 F in the form of powder or granulate; (b) forming a sintered body in cylinder or pellet form; (c) converting into the viscous state at 850-1200o C and compressing under a pressure of 2-6 bar into a mold corresponding to the dental restauration to form a glass ceramic containing 20-45 wt.% leucite. |
