JPS6324061B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a dental metal filling material that is used by mixing and kneading a Ga-based liquid metal and a metal powder. [Prior Art] Amalgam, which is a mixture of mercury and silver alloy powder, has been used as a dental metal filling material for many years. In other words, the amalgam obtained by mixing and kneading a predetermined amount of liquid metal mercury and silver-based alloy powder with a predetermined composition is filled into the cavity of a patient's tooth, and the alloying reaction progresses after filling. It hardens to withstand occlusion, and has been used until now because it is easier to prepare and handle than other dental alloys for casting. [Problems to be Solved by the Invention] However, since the above-mentioned conventional technology uses mercury, problems of toxicity to patients and handlers and environmental pollution have increased socially due to its toxicity. Therefore, as a metal wrought filling material for dental restorations that does not use mercury-based amalgam, Ga alone or Ca-based liquid metal can be used as a substitute for mercury.
By binary alloys such as Sn eutectic alloy, Ga-In eutectic alloy, Ga-Zn eutectic alloy, or a combination thereof.
A Ga-based alloy is used, and the metal powder includes Au, Ag, Cu,
Fundamental research has been carried out using powders of single metals such as Sn and Zn, or powders of alloys such as Au alloys and Ag alloys, targeting mixed kneaded products made by combining these liquid metals and metal powders. However, compared to mercury-based amalgam, it still has insufficient handling and various properties as a dental restorative material, and has not been put into practical use. [Means for solving the problems] The present invention uses 1 to 30 wt% Sn, In
and or Zn from 1 to 45wt% and the balance being Ga, as metal powder, Zn 5wt% or less, In 10wt% or less, Pt 10wt% or less, Ag 40wt% or less, and
The present invention is characterized in that one or more selected from the group consisting of 30 wt% or less of Cu and the remainder are Au, and the liquid metal is combined at a mass ratio of 1.5 or less to the metal powder 1. [Example] First example As liquid metal, Ga63wt%, In24wt%,
Sn13wt%, as metal powder, Au35wt%, Ag40wt%,
Cu23%wt% and Zn2wt%. The metal powder having the above-mentioned composition was produced by an atomization method, sieved through a predetermined sieve, and then heat-treated at 200° C. for 1 hour to prepare the powder. 0.85 g of liquid metal was added to 1 g of this alloy powder and mechanically kneaded for about 10 seconds using an amalgam mixer. Various scientific and engineering properties such as diametral tensile strength, dimensional change, and creep were measured for the above kneaded product in accordance with the test method of JIST6109. Further, the color fastness test was conducted in accordance with the regulations of JIST6108. The above results are shown in the table. The above measurement results of diametral tensile strength, dimensional change, and creep were compared with the JIS standard values, and all of them almost satisfied these values. In addition, the results of the color fastness test also satisfied the standards according to JIST6108. Second Example As liquid metals, Ga63wt%, In22wt%,
Zn2wt%, Sn13wt%, as metal powder, Au45wt%, Ag23wt%,
Pt1wt%, Cu25wt%, Zn2wt%, In4wt. The metal powder having the above-mentioned composition was produced by an atomization method, sieved through a predetermined sieve, and then heat-treated at 200° C. for 1 hour to prepare the powder. 0.7 g of liquid metal was added to 1 g of this alloy powder and mechanically kneaded for about 10 seconds using an amalgam mixer. Various scientific and engineering properties such as diametral tensile strength, dimensional change, and creep were measured for the above kneaded product in accordance with the test method of JIST6109. Further, the color fastness test was conducted in accordance with the regulations of JIST6108. The above results are shown in the table. The above measurement results of diametral tensile strength, dimensional change, and creep were compared with the JIS standard values, and all of them almost satisfied these values. In addition, the results of the color fastness test also satisfied the standards according to JIST6108. Third Example As liquid metal, Ga80wt%, Zn6wt%,
Sn14wt%, as metal powder, Au58wt%, Ag30wt%,
Zn2wt% and In10wt. The metal powder having the above-mentioned composition was produced by an atomization method, sieved through a predetermined sieve, and then heat-treated at 200° C. for 1 hour to prepare the powder. 0.75 g of liquid metal was added to 1 g of this alloy powder and mechanically kneaded for about 10 seconds using an amalgam mixer. Various scientific and engineering properties such as diametral tensile strength, dimensional change, and creep were measured for the above kneaded product in accordance with the test method of JIST6109. Further, the color fastness test was conducted in accordance with the regulations of JIST6108. The above results are shown in the table. The above measurement results of diametral tensile strength, dimensional change, and creep were compared with the JIS standard values, and all of them almost satisfied these values. In addition, the results of the color fastness test also satisfied the standards according to JIST6108. Fourth Example As liquid metal, Ga65wt%, In20wt%,
Zn3wt%, Sn12wt%, as metal powder, Au75wt%, Ag5wt%,
Pt10wt%, Cu8wt%, Zn2wt%. The metal powder having the above-mentioned composition was produced by an atomization method, sieved through a predetermined sieve, and then heat-treated at 200° C. for 1 hour to prepare the powder. 0.9 g of liquid metal was added to 1 g of this alloy powder and mechanically kneaded for about 10 seconds using an amalgam mixer. Various scientific and engineering properties such as diametral tensile strength, dimensional change, and creep were measured for the above kneaded product in accordance with the test method of JIST6109. Further, the color fastness test was conducted in accordance with the regulations of JIST6108. The above results are shown in the table. The above measurement results of diametral tensile strength, dimensional change, and creep were compared with the JIS standard values, and all of them almost satisfied these values. In addition, the results of the color fastness test also satisfied the standards according to JIST6108.

〔Effect of the invention〕

According to the present invention described in detail above, its scientific and engineering properties almost satisfy the JIS standard values, and its color fastness is also good. Furthermore, unlike mercury-based amalgam, it is not toxic at all and there is no need to worry about environmental pollution.

Claims (1)

[Claims] 1. As a liquid metal, Sn is 1 to 30 wt%, In and or Zn is 1 to 45 wt%, and the balance is Ga; as metal powder, Zn is 5 wt% or less, In is 10 wt% or less, Pt is 10 wt% or less, and Ag is 40 wt% or less. and
A dental metal comprising one or more selected from the group consisting of Cu30wt% or less and the remainder being Au, and the liquid metal is combined at a mass ratio of 1.5 or less to the metal powder 1. Kneaded filler.