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US 12,575,916 B2Granted
Block for dental prostheses
AssigneeGC Corporation
InventorsKatsuhito Kato, Shigenori Akiyama, Toshihiko Azuma
Life of this patent
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Abstract
A block for dental prostheses is in the form of a column or a board, a main crystalline phase of the block being of lithium disilicate, and when the block is observed in a field of view of a partially enlarged cross section of the block, the proportion of the total area of crystals having a length of at least 0.5 μm, the crystals appearing in the field of view, to an area of the field of view is at most 21%.
Claims8
A block for dental prostheses before being machined to form a dental prosthesis, the block comprising:
- 60 mass % to 80 mass % of SiO2;
- 10 mass % to 20 mass % of Li2O;
- 5.1 mass % to 15 mass % of Al2O3;
- and
- 6.4 mass % to 10 mass % of P2O5, wherein
- the block is in the form of a column or a board, and the block being of a material that is configured to be machined into a dental prosthesis without any required additional heat treatment after machining,
- a main crystalline phase of the block being of lithium disilicate, and
- when the block is observed in a field of view of a partially enlarged cross section of the block, a proportion of a total area of crystals having a length of at least 0.5 μm, the crystals appearing in the field of view, to an area of the field of view is at most 21%.
5 more elements
Dependencies are inferred from the claim text.