| 摘要 |
A glass-ceramic containing Li2O, CaO, Al2O3, SiO2, platinum and Nb2O5 is disclosed. It is highly suitable for use in dental restorations because of its combination of castability, chemical durability and mechanical strength. The aesthetic qualities of natural teeth may be reproduced by proper control of processing parameters, e.g. addition of coloring additives and devitrification heat treatment schedule. Dental restorations may be made by casting a melt in a conventional dental laboratory investment mold, followed by devitrification. Fracture of cast margins is avoided because of the mechanical strength and toughness of the glass-ceramic. Partial restorations can be bonded with dental cement directly to the tooth of a recipient without the need for building the restoration upon an undercoat of metal alloy. |
