Phosphosilicate glass ceramic
AssigneeIvoclar Vivadent AG
InventorsUrs Bolle, Marcel Schweiger, Elke Apel, Wolfram Höland, Volker Rheinberger
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Abstract
A phosphosilicate glass ceramic with nanoscale fluoroapatite and leucite crystals. The glass ceramic is very similar to natural tooth material in terms of its optical properties. The glass ceramic has a low linear thermal expansion coefficient and a low pressing temperature and is therefore particularly suitable for pressing on metal alloys to produce dental restoration.
Claims42
A phosphosilicate glass ceramic comprising:
- a plurality of fluoroapatite crystals, wherein said fluoroapatite crystals have a maximum extension of less than 100 nm;
- a plurality of leucite crystals;
- and
- the following components in weight percent:
- SiO2 57.6-62.0%
- Al2O3 12.0-16.0%
- B2O3 0.0-1.5%
- K2O 9.0-13.0%
- Na2O 5.0-8.0%
- Li2O 0.0-1.5%
- BaO 0.0-2.5%
- CaO 0.6-2.4%
- ZnO 0.0-3.0%
- TiO2 0.0-1.5%
- ZrO2 0.0-3.5%
- CeO2 0.0-1.0%
- P2O5 0.4-2.5%
- F 0.3-1.5%.
A method for preparation of a phosphosilicate glass ceramic comprising:
- a plurality of fluoroapatite crystals, wherein said fluoroapatite crystals have a maximum extension of less than 100 nm;
- a plurality of leucite crystals;
- and
- the following components in weight percent:
- SiO2 57.6-62.0%
- Al2O3 12.0-16.0%
- B2O3 0.0-1.5%
- K2O 9.0-13.0%
- Na2O 5.0-8.0%
- Li2O 0.0-1.5%
- BaO 0.0-2.5%
- CaO 0.6-2.4%
- ZnO 0.0-3.0%
- TiO2 0.0-1.5%
- ZrO2 0.0-3.5%
- CeO2 0.0-1.0%
- P2O5 0.4-2.5%
- F 0.3-1.5%, the method comprising:
- melting a glass comprising said components at temperatures of 1500 to 1550° C.;
- pouring the glass melt obtained into water to form a glass granulate;
- optionally comminuting the glass granulate to a glass powder with an average particle size of less than 90 μm, preferably 10 to 40 μm;
- and
- subjecting the glass granulate or the glass powder to a heat treatment in a temperature range of 500° C. to 1000° C. for a period of 30 minutes to 6 hours to form the glass ceramic.
A dental material shaped from phosphosilicate glass ceramic, said phosphosilicate glass ceramic comprising:
- a plurality of fluoroapatite crystals, wherein said fluoroapatite crystals have a maximum extension of less than 100 nm;
- a plurality of leucite crystals;
- and
- the following components in weight percent:
- SiO2 57.6-62.0%
- Al2O3 12.0-16.0%
- B2O3 0.0-1.5%
- K2O 9.0-13.0%
- Na2O 5.0-8.0%
- Li2O 0.0-1.5%
- BaO 0.0-2.5%
- CaO 0.6-2.4%
- ZnO 0.0-3.0%
- TiO2 0.0-1.5%
- ZrO2 0.0-3.5%
- CeO2 0.0-1.0%
- P2O5 0.4-2.5%
- F 0.3-1.5%.
A dental product shaped from phosphosilicate glass ceramic, said phosphosilicate glass ceramic comprising:
- a plurality of fluoroapatite crystals, wherein said fluoroapatite crystals have a maximum extension of less than 100 nm;
- a plurality of leucite crystals;
- and
- the following components in weight percent:
- SiO2 57.6-62.0%
- Al2O3 12.0-16.0%
- B2O3 0.0-1.5%
- K2O 9.0-13.0%
- Na2O 0.5-8.0%
- Li2O 0.0-1.5%
- BaO 0.0-2.5%
- CaO 0.6-2.4%
- ZnO 0.0-3.0%
- TiO2 0.0-1.5%
- ZrO2 0.0-3.5%
- CeO2 0.0-1.0%
- P2O5 0.4-2.5%
- F 0.3-1.5%.
A phosphosilicate glass ceramic consisting essentially of:
- a plurality of fluoroapatite crystals;
- a plurality of leucite crystals;
- and
- the following components in weight percent:
- SiO2 57.6-62.0%
- Al2O3 12.0-16.0%
- B2O3 0.0-1.5%
- K2O 9.0-13.0%
- Na2O 5.0-8.0%
- Li2O 0.0-1.5%
- BaO 0.0-2.5%
- CaO 0.6-2.4%
- ZnO 0.0-3.0%
- TiO2 0.0-1.5%
- ZrO2 0.0-3.5%
- CeO2 0.0-1.0%
- P2O5 0.4-2.5%
- F 0.3-1.5%.
A phosphosilicate glass ceramic comprising:
- a plurality of fluoroapatite crystals;
- a plurality of leucite crystals;
- and
- the following components in weight percent:
- SiO2 57.6-62.0%
- Al2O3 12.0-16.0%
- B2O3 0.0-1.5%,
- K2O 9.0-13.0%
- Na2O 5.0-8.0%
- Li2O 0.0-1.5%
- BaO 0.0-2.5%
- CaO 0.6-2.4%
- ZnO 0.1-3.0%
- TiO2 0.0-1.5%
- ZrO2 0.0-3.5%
- CeO2 0.0-1.0%
- P2O5 0.4-2.5%
- F 0.3-1.5%.
Dependencies are inferred from the claim text.