METHOD FOR PRODUCING DENTAL PROSTHESIS, METHOD FOR PRODUCING LITHIUM DISILICATE BLANK FOR DENTAL PROSTHESIS AND LITHIUM DISILICATE BLANK FOR DENTAL PROSTHESIS

• US 20190328495A1
• Filed: 07/09/2019
• Published: 10/31/2019
• Est. Priority Date: 08/27/2014
• Status: Active Grant

• Current Assignee: GC Corporation (General Cannabis Corp.)
• Original Assignee: GC Corporation (General Cannabis Corp.)
• Inventors: HOSHINO, Tomohiro, MASHIO, Go, FUJIMOTO, Tatsuya, YOSHINAGA, Masatoshi, YOKOHARA, Hayato, OHTA, Daisuke
• Granted Patent: US 11,166,795 B2
• Time in Patent Office: Days
• CPC Class Codes: A61C 13/0006 Production methods
• CPC Class Codes: A61C 13/0022 Blanks or green, unfinished dental restoration parts
• CPC Class Codes: A61C 13/083 Porcelain or ceramic teeth A61C13/081 takes precedence; preparations A61K6/80
• CPC Class Codes: A61K 6/831 comprising non-metallic elements or compounds thereof, e.g. carbon
• CPC Class Codes: A61K 6/833 Glass-ceramic composites
• CPC Class Codes: A61K 6/853 Silicates
• CPC Class Codes: A61Q 11/00 Preparations for care of the teeth, of the oral cavity or of dentures; Dentifrices, e.g. toothpastes; Mouth rinses
• CPC Class Codes: C03C 10/0027 containing SiO2, Al2O3, Li2O as main constituents
• CPC Class Codes: C03C 2204/00 Glasses, glazes or enamels with special properties
• CPC Class Codes: C03C 3/083 containing aluminium oxide or an iron compound
• CPC Class Codes: C03C 3/085 containing an oxide of a divalent metal
• CPC Class Codes: C03C 3/097 containing phosphorus, niobium or tantalum
• CPC Class Codes: C03C 4/0021 for dental use

Abstract

Provided is a block body that makes it possible to quickly produce a dental prosthesis with a good accuracy. A material of the block body including SiO₂ in an amount of 60.0 mass % to 80.0 mass %, Li₂O in an amount of 10.0 mass % to 20.0 mass %, Al₂O₃ in an amount of 5.1 mass % to 10.0 mass %, wherein the block body is formed in a column, and a main crystalline phase of the block body is lithium disilicate.

Claims

1. A block body before a dental prosthesis is produced therefrom by cutting work, the block body comprising:

a material comprising

SiO₂ in an amount of 60.0 mass % to 80.0 mass %,

Li₂O in an amount of 10.0 mass % to 20.0 mass %, and

Al₂O₃ in an amount of 5.1 mass % to 10.0 mass %,

wherein the block body is formed in a column, and a main crystalline phase is lithium disilicate.

2. The block body according to claim 1, the material further comprising:

at least one selected from the group consisting of Na₂O in an amount of no more than 2.8 mass %, K₂O in an amount of no more than 2.7 mass %, and TiO₂ in an amount of no more than 10.0 mass %.

3. The block body according to claim 1, the material further comprising:

at least one selected from the group consisting of CaO in an amount of no more than 3.0 mass %, SrO in an amount of no more than 10.0 mass %, BaO in an amount of no more than 10.0 mass %, MgO in an amount of no more than 3.0 mass %, Rb₂O in an amount of no more than 2.8 mass %, Cs₂O in an amount of no more than 2.8 mass %, Fr₂O in an amount of no more than 2.8 mass %, BeO in an amount of no more than 3.0 mass %, and RaO in an amount of no more than 10.0 mass %.

4. The block body according to claim 1, the material further comprising:

ZrO₂ in an amount of no more than 10 mass %.

5. The block body according to claim 1, wherein machinability is the same as or better than those of first and second references, the machinability being compared in a processing time, a degree of tool wear, and chippings, the first reference being a material whose main crystalline phase is lithium metasilicate, the material comprising SiO₂ in an amount of 72.3 mass %, Li₂O in an amount of 15.0 mass %, Al₂O₃ in an amount of 1.6 mass %, the second reference being a material comprising a crystalline phase of lithium metasilicate and a crystalline phase of lithium disilicate with a same ratio, Si₂O in an amount of 56.3 mass %, Li₂O in an amount of 14.7 mass %, and Al₂O₃ in an amount of 2.1 mass %.

6. The block body according to claim 1, wherein in an observation range of 60 μ

m in length and 60 μ

m in width on a cross section of the block body, an area occupied by voids is less than 2%.

7. The block body according to claim 1, wherein particles of a colorant are not observed within an observation range of 1 mm in length and 1 mm in width on a cross section of the block body.

8. A lithium disilicate blank for a dental prosthesis to be machined into a shape of a dental prosthesis without press molding, the lithium disilicate blank comprising:

SiO₂ in an amount of 60.0 mass % to 80.0 mass %;

Li₂O in an amount of 10.0 mass % to 20.0 mass %; and

Al₂O₃ in an amount of 5.1 mass % to 10.0 mass %;

wherein a main crystalline phase is lithium disilicate.

9. The lithium disilicate blank according to claim 8, further comprising:

at least one of ZrO₂ in an amount of 0.1 mass % to 10.0 mass %, and K₂O in an amount of 0.2 mass % to 10 mass %.

10. A lithium disilicate blank for a dental prosthesis to be machined into a shape of a dental prosthesis to form a dental prosthesis without a heating treatment after the machining, the lithium disilicate blank comprising:

SiO₂ in an amount of 60.0 mass % to 80.0 mass %;

Li₂O in an amount of 10.0 mass % to 20.0 mass %; and

Al₂O₃ in an amount of 5.1 mass % to 10.0 mass %,

wherein a main crystalline phase is lithium disilicate.

11. The lithium disilicate blank according to claim 10, further comprising:

at least one of ZrO₂ in an amount of 0.1 mass % to 10.0 mass %, and K₂O in an amount of 0.2 mass % to 10 mass %.