JPS6160852A - Dental gold alloy - Google Patents

Abstract

PURPOSE:To manufacture a dental gold alloy having age hardenability at a low cost by adding a specified element to a dental cast Au-Ag-Pd-Cu-Zn alloy. CONSTITUTION:At least one among 0.1-2% Pt, 0.1-5% Ni, 0.1-1% Zr, 0.1-1% Sb, 0.1-0.5% Al, 0.5-1% In, 0.05-1% Ru, 0.1-0.5% Si and 0.1-0.5% Mg is added to a cast alloy for dental treatment having a composition consisting of, by weight, 10-50% Au, 10-50% Ag, 0.5-20% Zn. The dental gold alloy having age hardenability, corrosion resistance, a deoxidizing effect and a grain refining effect is obtd. The alloy is inexpensive because of the relatively low Au content and the castability and mechanical properties are effectively improved.

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology is a casting metal used for dental treatment, in which other elements are added to a base alloy containing gold, silver, palladium, copper, and zinc. This invention relates to a dental gold alloy with additives, and in particular, as the base alloy, the component fiffi ratios are respectively gold 10 to 50%, 1110 to 50%, palladium 0.5 to 15%, and copper 5 to 30%. , zinc is in the range of 5 to 20%, and the composition and weight ratio of other elements added to the base alloy with such a composition is platinum in the range of 0.1 to 2.
．． 0%, nickel 0.1~5%, zirconium 0.1~
1%, antimony 0.1~1%, aluminum 0.1~
0.5%, iridium 0.05-1%, ruthenium 0.
05 to 1%, silicon 0.1 to 0.5%, and magnesium 0.1 to 0.5%, and with regard to the addition of elements with these compositions, at least one of these must be added to provide age hardening properties. This invention relates to a dental gold alloy.

<Problems to be solved by the invention> As is well known, alloys have been used for metals used in dental treatment over a long period of research and development. Firstly, it must be stable and do not change color over time after being placed in the oral cavity in daily life, and secondly, it must be able to be applied repeatedly through normal occlusion. It must be strong enough to withstand the force applied to it, and in addition, it must have a corresponding amount of elasticity in order to soften the ml to the oral cavity. Due to the nature that is revealed in interpersonal relationships, conditions such as having to be excellent in terms of beauty are highly desired.

And to deal with this, better alloys are being developed and adopted from time to time.

<Problems to be Solved> It is well known that the discoloration of the inner alloy mentioned above can now be addressed by using a metal-grade alloy with a high gold content. However, since it contains a large amount of gold, it becomes expensive, resulting in high cost, which is disadvantageous in that it is not economically viable.Therefore, there has been a demand for inexpensive products.

Therefore, in recent years, similar-grade alloys have been the subject of development, but the similar-grade alloys that have been developed so far have the disadvantage of being brittle in terms of mechanical properties.
This leads to the difficulty that it is practically impossible to use,
There was a problem in that it could not be used for dental treatment that required elastic force or toughness force.

The fact that brittleness and strength appear as contradictory properties has become an extremely large bottleneck in development.

The purpose of this invention is to solve the problems in gold alloys for dental treatment based on the above-mentioned prior art, and to
Although it has a base alloy whose main component is silver, the composition of the base alloy is blended to the maximum effective state, and other elements are added to comprehensively improve the metal properties for VJ construction in dental treatment. The object of the present invention is to provide an excellent dental gold alloy that is economically viable and does not interfere with daily life, and that is beneficial to the field of material utilization in the dental treatment industry.

In order to solve the above-mentioned problems, the groove composition of the present invention, which is based on the scope of the above-mentioned patent claims, is intended to solve the above-mentioned problems. In the base alloy, the synthesis R(1) mm ratio for gold, silver, palladium, copper, and zinc is 10 to 50%, 10 to
50%, 0.5 to 15%, 5 to 30%, and 5 to 20% to have excellent mechanical strength and elastic force, as well as toughness. jF has improved mechanical properties during use and is exposed frequently.
Even in case A, it has a warm, bright pale yellow color that matches the skin color of the oral cavity, has remarkable age hardenability during casting, and has corrosion resistance comparable to that of porcelain-grade alloys. In addition to having excellent tomoe ν1 and discoloration resistance, it further supports these properties and contributes deeply to this by promoting deoxidizing effects, improving workability, and grain refinement. Regarding the composition of other synthetic elements to be added, platinum, 0.
1-2.0%, nickel 0.1-5%, zirconium 0
．． 1-1%, antimony 0.1-1%, aluminum 0
．． The weight ratio ranges from 1 to 0.5%, iridium 0.05 to 1%, ruthenium 0.05 to 1%, silicon 0.1 to 0.5%, and magnesium 0.1 to 0.5%, Therefore, by selectively blending these elements, at least one of these elements is added in order to promote the above-mentioned hardening ability, thereby improving age hardenability, corrosion resistance, deoxidizing effect, grain refining effect, Technical measures have been taken to significantly maintain the effects of promoting castability and improving mechanical properties.

<Background of the Invention> The theoretical principles and reasons based on empirical repeated experiment data regarding the limiting conditions for the composition of the base alloy and additive elements in this invention are as follows. .

First, let's talk about the composition of the base alloys gold, silver, palladium, copper, and zinc. As is well known, gold has a large capacity to affect its color tone, color fastness, and mechanical strength.
If it is less than 10%, the corrosion-resistant effect will not be exhibited and the screen will fade, and if it is more than 50%, the cost will be high and it will not be worth it, so the insect m ratio is 10.
50%.

Next, silver is used to effectively utilize the fact that due to its additive properties, it has a large effect on promoting G1 machine range and improving castability.According to experiments, silver
This limitation is based on the fact that the range of % was found to be optimal compared to the data below and above it.

As for palladium, its synthetic properties make it resistant to corrosion, and it acts effectively in the oral cavity, preventing discoloration and elution.
It is known that it indirectly contributes to mechanical improvement,
In repeated experiments, it was found that if it is less than 0.5%, the overall effect is weak, and if it is more than 15%, it causes deterioration of workability and whitening of the alloy itself, so 0.5 is the optimal range. ~15% is adopted.

As for copper, age hardening is promoted by the gold-copper or palladium-copper ordered phase, and the copper-zinc color balance is achieved.
Experiments have shown that if the content is less than 30%, this effect is insufficient, while if it exceeds 30%, the corrosion resistance deteriorates, so the range is limited to 5 to 30%.

Next, regarding zinc, it is added to improve the color tone and castability due to copper-zinc, and experimentally it has been found that zinc is significantly less than 5% and more than 20%. Since it was found that these characteristics deteriorated, a weight ratio of 5 to 20% was specified as the optimum range.

The elements to be added to the above base alloy and their selective combinations are as follows.

First, regarding platinum, it completely forms a solid solution in the base alloy and effectively contributes to further improving corrosion resistance, and as a result of experiments, its similar ability is maximized at mff1 blending ratio. 0
, was confirmed to be within the range of 1 to 2.0%, and 0.1
This range was set as the optimum range because it was found that if the content is less than 2.0%, the effect is not significant, and if it is more than 2.0%, the color tone of the alloy becomes white, which is undesirable.

Next, regarding nickel, it was found that it is effective in promoting age hardenability and is also effective in improving workability, and the l1ffi blending ratio is 0.1%. Less than 5% has little effect.
It was discovered that if the weight ratio was exceeded, an undesirable phenomenon of whitening of the color tone as mentioned above was discovered, and as a result of these experiments, it was found that the optimal weight ratio range was 0.1 to 5%, so this range was limited. It is.

In addition, it was found that zirconium has an extremely good deoxidizing effect, contributes well to improving workability, and further contributes to the crystal grain refinement effect, and these remarkable effects can be seen at 0.1% by weight. It was found that if it exceeds 1%, it deteriorates the castability.
This is limited to the m ratio range.

Next, regarding antimony, it has the ability to promote age hardening, improve castability, and! 5 It was found that it is effective as a force element in significantly improving the opening degree, and experimentally it was found that its addition m was 0.1 to 1 in weight ratio.
% was found to be the optimum range, so that range was set as the blending ratio. Therefore, it is known that aluminum is effective in dramatically improving the mechanical properties of the alloy, and the mm ratio for its optimum effect is in the range of 0.1 to 0.5%. is experimentally
When IC is absorbed, the effect is weak when it is less than 0.1%;
．． This limited range of weight ratio was determined because it was found that if the content exceeds 5%, oxides are formed, which impairs castability and causes embrittlement.

Regarding iridium, it is known that it is an element that is particularly strongly involved in grain refinement, and as a result, mechanical properties can be improved by adding iridium, but the effect is weak at less than 0.05%. On the other hand, it has been experimentally found that when the content exceeds 1%, the content becomes brittle, so the optimum range is set to 0.05 to 1%.

Next, regarding ruthenium, it is an element that effectively works to improve mechanical properties, but if it is less than 0.05%, it will hardly have an effect that leads to improvement, and if it is more than 1%, the alloy will become brittle. Since it has been experimentally confirmed that the effective insect-wage ratio is 0.05 to 1%, it has been determined that the range of the optimum effective insect-wage ratio is 0.05 to 1%.

Next, silicon has a great deoxidizing effect,
Also, although it is an element that greatly contributes to improving castability,
It has been experimentally found that if the addition m is less than 0.1% in a3 to 1lJflt ratio, no effect will be obtained, and if it exceeds 0.5%, it will cause embrittlement as well, so it is optimal.
The range of the fi ratio is limited to 0.1 to 0.5%.

Finally, regarding magnesium, it is an element that is deeply involved in improving functions within the I region and improving U permeability due to the fill effect, and also has a sufficient effect on grain refinement. As a result of the confirmation, the effect is insufficient when the weight blending ratio is less than 0.1%, and 0.5%.
It has been found that the alloy becomes brittle when the content exceeds 0.1% to 0.5% by weight.

<Examples> Next, examples of the present invention will be described based on Table 1. Table 1 Regarding the dental gold alloys of the examples in Table 1 above,
It is melted in a gas furnace, cast into a predetermined shape, cold rolled, and then processed into a predetermined shape.

Table 2 shows the results of material tests conducted on the example alloys shown in Table 1 above and the comparative known alloys in order to obtain comparative data.

Table 2゛01×Sodium sulfide I! WL72hrJMcaIn this case, for each test sample, tl, oxwl
A plate-shaped specimen for hardness, color tone, and structure observation with a diameter of 15 mm and a rod-shaped specimen for measuring tensile strength and elongation with a diameter of 2.0 x 50 III was prepared.

The contents of each test are as follows: 1) Hardness test A load of 200
2) Tensile strength test Measured under the condition of load loading time of 30 seconds.Gage distance 20III according to Tensilon tensile test.
Measurement was carried out on a test piece with a tensile strength of 110 n1I/1n.

3) Elongation measurement test 4-discoloration observation test The test piece was polished with No. 400 abrasive paper specified by JIS, R16253, and then completely immersed in a 0.1% sodium sulfide solution at 37±2°C for 3 days. 5) Color w4 observation by observation of discoloration state After polishing with No. 400 abrasive paper specified in JIS-R 6253 (water resistance g # roughness) JIS 2 8721
(Color display method based on three attributes) compliant standard color table.

As can be seen from the results of the property data in Table 2 above, the dental gold alloy of the present invention has superior age hardenability compared to conventionally known gold alloys, and is required for dental treatment. It is clearly shown that the material has strength, elongation, elasticity, and evenness that would be much more desirable to have.

It has also been shown that the color tone and corrosion resistance are good.

It goes without saying that the embodiments of this invention are not limited to the above-mentioned embodiments, and for example, many types B can be adopted in which equivalent base alloys and additives can be blended. It is.

<Effects of the Invention> As described above, according to the present invention, basically, in a dental gold alloy, the composition of the base alloy is set to the 0 ratio of the composition blending type in the scope of the above-mentioned claim VI, and also trace additive elements can be added. By setting the composition and weight of the alloy, it is possible to have age hardenability, elasticity, and toughness equivalent to backing metal grade alloys, even though it has a low gold grade, and also has good corrosion resistance. It is possible to achieve an excellent effect in which the advantages necessary for the treatment of each element can be maximized mutually.

In this way, the strength and elongation actually required for low-grade treatment,
In other words, it has elasticity and toughness, and is also excellent in color tone and corrosion resistance, so it essentially eliminates the problems of gold alloys for casting metal treatment in dental treatment. However, it has an excellent effect that it can be used for a wide variety of dental treatments, and it also has an excellent effect that it can be supplied at a low cost because it is of low gold quality. be done.

Claims (1)

[Claims] Gold, silver, palladium, copper, and zinc.
In a dental gold alloy in which other elements are added to a palladium/copper/zinc base alloy, the component weight ratio of gold, silver, palladium, copper, and zinc in the base alloy is 10 to 50% and 10 to 5%, respectively.
0%, 0.5-15%, 5-30%, and 5-20%, and the composition and weight ratio of other additive elements to the base alloy are 0.1-2.0% platinum and 0.0% nickel. 1-5%, zirconium 0.1-1%, antimony 0.1-1%, aluminum 0.1-0.5%, iridium 0.05-1%
, Ruthenium 0.05-1%, Silicon 0.1-0.5
%, magnesium 0.1 to 0.5%, and at least one of these elements is added to make the dental gold alloy have age hardenability.