Method of making selenium-containing amalgam alloys for dental restoration

• US 4,702,765 A
• Filed: 02/18/1986
• Issued: 10/27/1987
• Est. Priority Date: 04/02/1982
• Status: Expired due to Fees

• Current Assignee: Atsushige Sato, G-C Dental Industrial Corporation, Ishi Miura
• Original Assignee: Atsushige Sato, G-C Dental Industrial Corporation, Ishi Miura
• Inventors: Nakano, Tsuyoshi, Okuno, Osamu, Miura, Ishi, Sato, Atsushige, Kumei, Yasuhiro, Yoshida, Bunsaku
• Primary Examiner(s): Brody, Christopher W.
• Application Number:
  US06/829,862
• Time in Patent Office: 616 Days
• Field of Search: 75/0.5 B, 75/0.5 C, 75/0.5 R, 420/590, 241/3, 264/8, 264/12, 264/13, 264/14
• US Class Current: 75/333
• CPC Class Codes: A61K 6/847 Amalgams
• CPC Class Codes: C22C 7/00 Alloys based on mercury
• CPC Class Codes: Y10S 75/955 Producing dental product

Abstract

Selenium-containing amalgam alloys for dental restoration comprises 0.1-50% by weight of any one of the following alloy powders (A), (B) and (C) mixed with 50-99.9% by weight of the following amalgam alloy powders (D).

(A): Silver alloy powders containing no less than 50% by weight of silver and 0.01-10% by weight of selenium,

(B): Copper alloy powders containing no less than 50% by weight of copper and 0.01-5% by weight of selenium,

(C): Alloy powders mix of (A) with (B) wherein the total amount of silver and copper is adjusted to no less than 50% by weight, and the amount of selenium to 0.01-10% by weight, and

(D): Silver-tin-copper amalgam alloy powders.

At least one of the any one of (A), (B) and (C) and (D) may be pre-amalgamated with mercury in an amount of no higher than 3% by weight based on the total weight thereof.

Claims

1. A process for the preparation of selenium-containing amalgam alloys for dental restoration comprising the steps of:

melting a copper alloy containing no less than 50% by weight of copper and 0.01-5% by weight of selenium,

reducing the resulting melt to powders having a desired particle size by spraying the melt by means of a centrifugal force, and

mechanically mixing 0.1-50% by weight of the thus obtained powders with 50-99.9% by weight of a silver-tin-copper amalgam alloy powder obtained by melting a silver-tin-copper amalgam alloy, and reducing the resulting melt to a powder having a desired particle size by spraying the melt in an inert gas stream.

2. A process for the preparation of selenium-containing amalgam alloys for dental restoration comprising the steps of:

melting a copper alloy containing no less than 50% by weight of copper and 0.01-5% by weight of selenium,

reducing the resulting melt to powders having a desired particle size by spraying the melt in an inert gas stream by means of a nozzle, and

mechanically mixing 0.1-50% by weight of the thus obtained powders with 50-99.9% by weight of a silver-tin-copper amalgam alloy powder obtained by melting a silver-tin-copper amalgam alloy, and reducing the resulting melt to a powder having a desired particle size by spraying the melt in an inert gas stream.