JPH0253503B2 - - 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 Ga-based liquid metal can be used as an alternative to 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 13.5 wt% Sn as a liquid metal.
In or Zn1 to 45wt% and the balance is Ga, and the metal powder is two or more selected from the group consisting of Cu30wt% or less, In25wt% or less, Zn15wt% or less, and Pd25wt% or less, Sn35wt% or less, and the balance Ag. , characterized in that the liquid metal is combined with the metal powder 1 at a mass ratio of 1.5 or less. Here, the liquid metal can be kept in a liquid state at room temperature by using a ternary alloy of 1 to 13.5 wt% Sn, 1 to 45 wt% In or Zn, and the balance Ga. However, Sn is less than 1wt%, In or Zn is 1wt%
If it is less than 45wt% or more than 45wt%, it tends to be difficult to maintain a liquid state at room temperature. Also, Sn is 13.5wt%
If it exceeds this amount, there will be an inconvenience that the curing reaction during kneading will be delayed. Next, the metal powder contains two elements of Ag and Sn of 35wt% or less in order to make the kneaded product obtained by kneading with the liquid metal have various dental science and engineering properties that can be put to practical use. In addition, Cu30wt% or less,
This is a quaternary or higher alloy containing two or more of the following elements: In25wt% or less, Zn15wt% or less, and Pd25wt% or less.All of these quaternary or higher alloy powders are mixed with the liquid metal in a predetermined ratio. By combining and kneading, a good kneaded and cured product can be obtained. However, when Sn exceeds 35wt%, the curing reaction of the kneaded product is significantly delayed, and Cu is convenient for increasing the mechanical strength of the kneaded product, but at 30wt%
%, the curing reaction will be significantly delayed. In,
When the composition of Zn exceeds each upper limit, the brittleness of the kneaded product increases and the mechanical strength decreases. Pd
Although this is convenient for accelerating the curing reaction of the kneaded product, if the upper limit of the composition is exceeded, there is a problem in that the size of the kneaded product increases greatly when it is cured. In addition, the ratio of the liquid metal and alloy powder to be combined during kneading was set to be less than 1:1.5 in mass ratio because if the ratio of liquid metal exceeds 1.5, the curing reaction of the kneaded product will be delayed. This is because the following problem arises. [Examples] Examples of the present invention are shown in Table 1 below.

[Table] The metal powders with the above component compositions were manufactured by the atomization method, and after being sieved with a specified sieve, they were heated at 200℃ for 1
Adjusted by heat treatment. Liquid metal was added to 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 and the blending amounts of alloy powder and liquid metal are shown in Table 2.

[Table] The above measurement results of diametral tensile strength, dimensional change, and creep were compared with JIS standard values, and all of them almost satisfied these. In addition, the results of the color fastness test also satisfied the standards according to JIST6108. [Effects 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. A dental metal wrought filling material used by kneading a combination of a liquid metal alloy and a metal alloy powder, the liquid metal alloy containing 1 to 13.5 wt% of Sn, and In or
An alloy containing 1 to 45%wt of Zn and the balance of Ga, and metal alloy powder is mixed with two or more selected from the group consisting of 30wt% or less of Cu, 25wt% or less of In, 15wt% or less of Zn, and 25wt% or less of Pd, and 35wt% or less of Sn and the remainder. A dental metal wrought filling material, characterized in that the above-mentioned liquid metal alloy is combined with the above-mentioned metal alloy powder 1 in a mass ratio of 1.5 or less.