Method for producing dental prosthesis, method for producing lithium disilicate blank for dental prosthesis and lithium disilicate blank for dental prosthesis

• US 10,405,953 B2
• Filed: 04/27/2017
• Issued: 09/10/2019
• 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
• Primary Examiner(s): Wiese, Noah S
• Application Number:
  US15/499,252
• Publication Number:
  US 20170224450A1
• Time in Patent Office: 866 Days
• Field of Search: 501 5
• 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 4/0021 for dental use

Abstract

Provided is a method for quickly producing a dental prosthesis with a good accuracy.

The method for producing a dental prosthesis including: a melting step of melting a material including no less than 60.0 mass % and no more than 80.0 mass % of SiO₂, no less than 10.0 mass % and no more than 20.0 mass % of Li₂O, and no less than 5.1 mass % and no more than 10.0 mass % of Al₂O₃; a glass blank production step of cooling to solidify the molten material to obtain a glass blank; a lithium disilicate blank production step of heating the glass blank to obtain a lithium disilicate blank whose main crystalline phase is lithium disilicate; and a processing step of processing the lithium disilicate by machining.

Claims

1. A lithium disilicate blank for a dental prosthesis to be machined into a shape of a dental prosthesis, the lithium disilicate blank comprising no less than 70.6 mass % and no more than 80.0 mass % of SiO₂, no less than 10.0 mass % and no more than 20.0 mass % of Li₂O, and no less than 5.1 mass % and no more than 10.0 mass % of Al₂O₃, and no less than 0.1 mass % and no more than 10.0 mass % of ZrO₂, not comprising Ta₂O₅.

2. The lithium disilicate blank for a dental prosthesis according to claim 1, further comprising no less than 0.2 mass % and no more than 10.0 mass % of K₂O.

3. The lithium disilicate blank for a dental prosthesis according to claim 1, further comprising at least one of V₂O₅ and Er₂O₃.

4. The lithium disilicate blank for a dental prosthesis according to claim 1, whose main crystalline phase is lithium disilicate.