Method of producing a dental mold

• US 20060125130A1
• Filed: 02/09/2006
• Published: 06/15/2006
• Est. Priority Date: 05/15/2002
• Status: Abandoned Application

• Current Assignee: Matsumoto Dental University
• Original Assignee: Matsumoto Dental University
• Inventors: Kuroiwa, Akihiro
• Application Number:
  US11/349,931
• Publication Number:
  US 20060125130A1
• Time in Patent Office: Days
• US Class Current: 264/16
• CPC Class Codes: A61C 13/20 Methods or devices for soldering, casting, moulding or melting A61C13/04, A61C13/081 take precedence
• CPC Class Codes: B28B 7/346 Manufacture of moulds
• CPC Class Codes: C04B 14/06 Quartz; Sand
• CPC Class Codes: C04B 18/167 Recycled materials, i.e. waste materials reused in the production of the same materials
• CPC Class Codes: C04B 2111/00836 for medical or dental applications
• CPC Class Codes: C04B 2111/00939 for the fabrication of moulds or cores
• CPC Class Codes: C04B 22/124 Chlorides of ammonium or of the alkali or alkaline earth metals, e.g. calcium chloride
• CPC Class Codes: C04B 22/142 Sulfates
• CPC Class Codes: C04B 28/14 containing calcium sulfate cements gypsum-paper plates E04C
• CPC Class Codes: C04B 38/061 by melting out
• CPC Class Codes: Y02W 30/91 Use of waste materials as fillers for mortars or concrete

Abstract

A dental mold is formed using, as a material, a mold material that formed a first mold having a first mold surface, and has a second mold surface different from the first mold surface. Alternatively, the material of the mold material contains powder after use obtained by grinding the first mold, and new powder added to the powder after use. The mold material is a quick heating type gypsum bonded mold material, and contains 1% of at least α gypsum. Alternatively, the mold material uses α gypsum at 25 to 45% and at least one of quartz and cristobalite at 55 to 75%. Further, the mold material contains one of chloride and alum as an additive.

Claims

1. A method of producing a dental mold, the method comprising a first step of obtaining powder by grinding a first mold made of a mold material and having a first mold surface, and a second step of forming a second mold having a second mold surface different from said first mold surface, using said powder.

2. A method according to claim 1, wherein a mold made of a quick heating type gypsum bonded mold material is used as said first mold.

3. A method according to claim 1, wherein said second step includes a step of forming a wax pattern from a wax material, a step of forming said second mold from said powder around said wax pattern, and a step of heating said wax pattern to flow out said wax material from said second mold.

4. A method according to claim 3, wherein the step of forming said second mold includes kneading said powder with water to obtain paste, and placing said paste around said wax pattern and solidifying it.

5. A method according to claim 1, wherein a mold containing 1% of at least α

gypsum is used as said first mold.

6. A method according to claim 1, wherein a material comprising 25 to 45% α

gypsum and 55 to 75% of at least one of quartz and cristobalite is used as said mold material.

7. A method according to claim 2, wherein a material containing one of chloride and alum as an additive is used as said mold material.

8. A method according to claim 7, wherein an added amount of said additive is 0.01 to 35%.

9. A method according to claim 1, wherein a particle size of said powder is within a range of 60 mesh to 300 mesh.

10. A method according to claim 1, wherein said second step includes adding new powder made of a quick heating type gypsum bonded mold material, to said powder.

11. A method according to claim 1, wherein a particle size of said new powder is within a range of 60 mesh to 300 mesh.

12. A method of forming a dental mold, comprising:

forming a first mold with a first mold material having a first mold surface;

thereafter, grinding the first mold to obtain a powder containing the first mold material; and

thereafter, forming the dental mold with the powder obtained by grinding the first mold and with a second mold material that was not previously used to form the first mold or any other mold,

wherein the dental mold has a second mold surface that is different in shape from the first mold surface that was used to form the first mold.