JPS6230830A - Palladium-gold alloy for baking dental ceramic material - Google Patents

Abstract

PURPOSE:To obtain a Pd-gold alloy for baking dental ceramic material excellent in mechanical and physico-chemical properties by adding specific percentage of Ga, Sn, Fe and Ir to a base alloy consisting of specific percentage of Pd, Au, Sb and In. CONSTITUTION:The base alloy having a compounding weight ratio consisting of 30-75% Pd, 10-60% Au, 1-25% Sb and 0.5-15% In is prepared, to which at least one kind among additive elements having a compounding weight ratio consisting of 0.01-10% Ga, 0.01-10% Sn, 0.1-5% Fe and 0.01-1% Ir is added. In this way, the Pd-gold alloy most satisfactory in respects of physical, mechanical and chemical properties, sanitation and aesthetic appreciation required of artificial teeth etc., for dental treatment can be manufactured.

Description

[Detailed description of the invention] <Industrial application field>.

The disclosed technique has application to the field of alloy composition techniques for baking porcelains in dental healing treatments.

<Summary of the gist> The present invention is an alloy for baking dental porcelain, which is a base alloy consisting of a predetermined composition of palladium, gold, antimony, and indium, in which other trace elements are added. This invention relates to a palladium-gold alloy for baking dental porcelain materials, and in particular, the composition of the base alloy is set to 30 to 75% palladium and 1% gold in terms of its raw material elements and Wffi ratio.
0-60%, antimony 1-25%, indium 0.5
A composition alloy with a compounding ratio of 15% to 15%, and other trace elements added to this alloy have a compounding ratio of 0.01 to 10%, soot 0.0
1-10%, iron 0.1-5%, iridium 0.01-1
%, and the present invention relates to a palladium-gold alloy for use in baking dental porcelain materials, in which one or more of these trace elements are added to the compositional alloy having the above-mentioned compounding ratio.

<Prior art> As is well known, there are various healing methods and means in dental treatment, but various technical techniques have been developed to use dentures to function as a substitute for missing teeth such as folds. It has been used since ancient times.

Therefore, these seed dentures have recently been developed with a physical aspect that deals with the function in use, a chemical aspect that deals with changes in properties during use,
Three aspects of aesthetics, which greatly influence the feeling and psychology during use, are becoming important as constraints for healing and techniques, and it is necessary to basically satisfy these three aspects. For a long time, a technique has been used to bake porcelain on the surface of a metal sole, mainly made of alloy, to integrate it, and the alloy with this porcelain baked can be used as a so-called porcelain baking alloy. has been done.

Therefore, the basic conditions of the porcelain baking alloy that restrict the function of dentures include, of course, the inherent mechanical properties of the porcelain in order to match the properties of the porcelain to which it is bonded. Although it is hard, the downside of brittleness is compensated as much as possible by the alloy metal, and there are inherently strong physicochemical bonding conditions that aim to integrate the two.

The elastic modulus of the alloy is high with respect to the occlusal force applied during frequently repeated occlusal chewing in the oral cavity, and the coefficient of thermal expansion of the porcelain and the alloy during baking are matched as much as possible. Furthermore, the physicochemical properties of both during firing include that the melting point of the alloy is higher than the firing temperature of the porcelain, and that the bonding strength between the metal molecules of the porcelain and the alloy is strong during firing. It is considered a necessary condition to be a yoshi.

The conventional porcelain firing alloys that have been developed so far can be roughly divided into platinum alloys containing gold as the main component, palladium-silver thread alloys containing palladium and silver as the main component,
It is classified into non-noble metal alloys whose main components are nickel, chromium, and cobalt.

<Problems to be Solved by the Invention> In addition to the above-mentioned conventional porcelain baking alloys, platinum metal alloys mainly composed of gold have a thermal expansion ratio of gold that is higher than that of gold. Since it almost matches that of J material, it has a strong bonding force with porcelain.
Although porcelain has the advantage of being widely used due to its good compatibility and its long-standing psychological satisfaction, it goes without saying that porcelain is the main ingredient. However, since gold is the main component, the hardness value is low, and therefore, although it has good compatibility with porcelain, As a baking alloy, it is soft and has the disadvantage of not being able to withstand the occlusal pressure applied during the above-mentioned occlusion, and there is a risk that the bonded porcelain may peel off from the alloy due to repeated feeding. Furthermore, due to its weak strength against high ff1 degrees, the alloy is deformed during the porcelain firing process and does not meet basic requirements.

On the other hand, palladium-silver thread alloys, which mainly consist of palladium and silver, do not contain gold compared to the above-mentioned platinum metal alloys, so although they have the advantage of being cheaper in terms of cost and having a higher hardness value, However, it still has the disadvantage that it is insufficient as an ideal hardness value to sufficiently withstand the occlusal pressure during feeding, and the porcelain H becomes colored during firing, making it difficult to use for porcelain firing. It had the disadvantage of losing aesthetics, which is a major feature of alloys, and was not as good as pure metal alloys whose main component is gold.

In addition, non-precious metal alloys are the cheapest in terms of cost and have excellent hardness and high-temperature strength, but they have poor castability due to the technical aspects of dental healing treatment, and they also have poor elemental content. The disadvantage is that oxides of the main components are likely to form, and therefore the porcelain becomes colored during firing, making it less aesthetically pleasing as a comparison material.Furthermore, it has the disadvantage that the bonding strength with the porcelain is not sufficient. Therefore, it was inferior to the Nikimon metal-based alloy, which has gold as its main component.

The purpose of this invention is to solve the technical problems of the platinum metal-based alloy, which has gold as its main component, which is inherently excellent as an alloy for porcelain baking based on the above-mentioned prior art. , improve mechanical properties such as modulus and strength,
In addition, it has excellent physical and chemical properties such as high-temperature strength properties, castability, and melting point, and also has excellent bonding properties with porcelain, meeting almost all of the 14 properties required for an alloy for porcelain baking. It seems to be satisfying and also has a low cost! 3 alloy gold,
On the other hand, we have decided to select other trace elements that will further improve the superiority of the alloy as a porcelain baking alloy through selective addition.
1st A fee @ i! ? ? Our objective is to provide an improved palladium-gold alloy for use in Yamamura porcelain firing, which will benefit the field of dental medicine and treatment technology that is part of the medical industry.

<Means/effects for solving the problem> In line with the above purpose, what is the above mentioned special method? In order to solve the above-mentioned problems, the present invention, which has the scope of the T-claim, is basically a palladium-gold alloy for baking porcelain used in dental healing and treatment. In addition, when firing the alloy with the porcelain, the melting point is higher than that of the porcelain H, improving the bonding and compatibility between the alloy and the porcelain, and preventing discoloration in the oral cavity. The weight ratio of palladium, which is necessary to prevent corrosion, is 30 to 75%, and the thermal expansion coefficient of gold is basically the same as that of porcelain. match(
], Therefore, it is necessary to strengthen the bonding force between the porcelain and the alloy and improve the mechanical properties, and the ff1ffi ratio is 1.
0 to 60% to reduce cost, and antimony is added not only to improve compatibility with porcelain, but also to improve castability, producing six colors in porcelain.
The weight ratio is set to 1 to 25% so as not to reduce the aesthetic color.Furthermore, for indium, a fertilized film is formed on the alloy surface to strengthen the bond between the porcelain and the alloy. Furthermore, in order to improve castability and compatibility, the weight ratio is set at 0.5 to 15%, and H is selectively added to the base alloy with these compositions to enhance these properties. It increases the bonding force with the porcelain material to improve the quality, reproduces an aesthetically healthy color on the gums in the oral cavity, provides a deoxidizing effect, improves mechanical properties, improves castability, and improves crystallization. For other additive elements, 0601 to 0601 for gallium is used to reduce the size of the alloy and prevent brittleness of the alloy.
10%, 0.1 to 10% for tin, 0.1 to 5% for iron, and 0.0 for iridium.
The composition has an ff1ffi ratio of 1 to 1%, and technical measures have been taken to selectively improve the characteristics of at least one of these elements.

<Cost of theoretical composition> Next, the fl department of this invention! ! We will discuss the qualitative aspects of the tIU formulation of each component and their weight ratios in the palladium-gold alloy for kJ material baking, and the reasons for the theoretical cost and experimental weight limit for quantitative limitations.

That is, first, to explain the base alloy, palladium is used as a dental treatment material to ensure sufficient bonding and compatibility with porcelain, and therefore, it has a thermal expansion coefficient that is the same as that of porcelain. It is necessary to increase the melting point of the alloy to higher than 8 degrees (firing of porcelain), and furthermore,
As mentioned earlier, it is a basic metal that is necessary to ensure that it does not change color or elute in the oral cavity after the tooth is attached, and also has sufficient corrosion resistance. Experiments have shown that the effect is reduced, and if more than 75% is added, the melting point becomes higher than necessary, which not only deteriorates buildability and compatibility, but also worsens the bonding force with the porcelain. Since it was confirmed that this addition weight ratio is 30
~75%.

Next, regarding gold, we will strengthen the bond between the alloy and the porcelain.
(2) It is necessary to improve mechanical properties, and if it is less than 10%, no effect can be expected, and if it is more than 60%, the Ia mechanical Bi properties will decrease, and it will not be able to withstand occlusal pressure, resulting in loss. 1- Since chives are highly linked, the optimum addition amount has been experimentally set at 10 to 60%.

In addition, antimony is added to improve castability and compatibility with porcelain, and when the denture is placed in the mouth, exposed metal parts around the tongue side will appear. However, in order to aesthetically reproduce the healthy color of the gums in the affected area and to ensure that the design is not bad, there has been some practice in history to prevent discoloration of the porcelain material. !Tiff1, which is necessary for the purpose of
In contrast, the result is lf], and even though it is 25
It was experimentally confirmed that adding more than 1% of antimony would result in loss of its good function.Therefore, for antimony, the weight ratio was limited to 1-25% as the optimal addition range (:
).

Regarding indium, it improves the elasticity against the occlusal pressure applied during the light ejaculation in Ll v, improves the mechanical properties, and improves the L size 1! On the other hand, when bonding with porcelain, it forms a thin oxide film with an ia degree on the alloy surface to improve castability and compatibility, and experiments have shown that in order to fully demonstrate these characteristics, It is necessary to add a minimum weight ratio of 0.5%, whereas it has been confirmed that adding more than 15% deteriorates the high temperature properties and causes the alloy to become brittle. Therefore, the addition weight of indium The ratio () is within a limited range of 5 to 15%.

Regarding the other mff1 elements that are selectively added to the base alloy having these compositions, first, gallium has the function of providing 1I11 acid seedlings to the alloy, and Not only does it form an appropriate oxide film on the surface to strengthen the bond with the porcelain, but also
Attach the IT teeth in your mouth! In this case, it is possible to effectively reproduce a healthy color that does not affect the aesthetics of the gingival area of the metal exposed area around the tongue side, and also to prevent the aesthetics from deteriorating due to coloring of the porcelain. According to experiments, the amount necessary for these effects to be properly maintained is 0.01% and 10%.
%, if it is less than 0.01, the effect mentioned above cannot be achieved, whereas if it exceeds 10%! 7i Manufacturability%'>
Since it was found that the compatibility deteriorated, the weight ratio was set at 0.01 to 10%.

In addition, tin is added to improve the mechanical properties against occlusal pressure during 141 occlusion, and like palladium, is added to strengthen the bonding force with porcelain, and according to experiments, If it is less than 0.01%, the effect is weak and 10
If it exceeds %, it becomes brittle and undesirable, so the lff1
The ratio is limited to 0.01 to 10%.

Next, due to its basic properties, iron improves mechanical properties by 1:1, and also forms an appropriate oxide film on the alloy surface to reduce the Pi strength with the porcelain. +, also an element necessary to increase the elastic modulus of the alloy, 0.1%
It has been experimentally confirmed that if the weight is less than 5%, these desired effects will hardly be achieved, but if the weight is added in excess of 5%, the properties will be adversely affected. The ratio was determined to be 0.1-5%.

Most importantly, iridium is added to increase the mechanical properties and to make the crystals finer.
According to experiments, it has been confirmed that the expected effect is insufficient when the weight ratio of iridium is less than 0.01%, and that the alloy becomes brittle when the weight ratio of iridium is added to 1% or more. The optimum range is 0.01 to 1%.

<Examples> Next, Examples of the present invention are shown in Table 1 below, and are shown together with known alloys for baking porcelain.

Sample numbers 1 to 10 6 of the comparative example in Table 1,
For the known alloys of sample numbers 11 and 12, each material element was melted in a well-known high frequency heating melting furnace at a melting temperature of 1400°C for 30 minutes, and t 10X w 50X
It was machined into a shape of 100 mm and then rolled into a predetermined shape using a well-known rolling roll.

Each of the samples of the example, which had been cast as described above, and the processed material of the known alloy were cast by the centrifugal casting method. A desired number of plate-shaped specimens of Oxw 10X 15 mm were formed and a hardness test was conducted.

Also, φ2. Oxl 50m+
A rod-shaped test piece was prepared and subjected to a tensile test and an elongation measurement test.゛The contents of each test are as follows.

1) Hardness Test The micro Vickers hardness test was carried out under the conditions of a load of 200 g and a load application time of 30 seconds.

2) Tensile strength test A tensile test piece with a gauge length of 20 mm was measured using a Tensilon tensile tester at a tensile speed of +Omm/min.

3) Elongation measurement test This test was conducted in the same manner as the above tensile strength test.

4) Discoloration observation test For each test piece, JIS-R 6253 current 400
After polishing with abrasive paper, one type of specimen was heated to 37±2℃.
After being completely immersed in a 0.1% sodium sulfide solution for 3 days, a discoloration of 11!2 was observed.

For other types of test pieces, 0.1% at 37±2℃
1% sodium sulfide, 1% lactic acid, etc. in the heated solution
The state of discoloration was observed after being completely immersed for a day.

5) Porcelain discoloration observation test The presence or absence of porcelain discoloration after baking the porcelain on each test piece was determined by l[
I guessed it.

The results of each of the above-mentioned tests are shown in Table 2. In Table 2, 0 indicates no change at all during the discoloration test.

As shown in Table 2 above and seen from the test data, the palladium-gold alloy for porcelain baking of the present invention has significantly superior tensile strength compared to conventional known alloys. There is no inferiority in terms of elongation, and there is data that fully satisfies the special conditions compared to porcelain.

It goes without saying that the embodiments of the present invention are not limited to the above-mentioned embodiments. Various embodiments can be adopted, such as that equivalent elements can be used instead.

<Effects of the Invention> As described above, according to the present invention, basically, in an alloy for baking dental materials, the composition of the base alloy and the trace elements added thereto are adjusted to meet the constituent requirements described in the scope of the claims. As a result of this limitation, the physical, volumetric, chemical properties, hygiene, and aesthetics required for oral healing treatment such as dentures are almost completely satisfied; The 11-karat gold alloy that is added to the bacteria can provide a pickled effect.

Therefore, even when it is placed in the oral cavity, the bonding state with the porcelain material is maintained sufficiently, and moreover, it is able to withstand mechanically repeated applied forces during occlusion caused by light 1 during feeding. It maintains a sufficient elastic modulus and prevents the porcelain from peeling,
Also, lingual circumference)! The excellent effect of reproducing and maintaining the esthetically healthy color of the gingival part of the exposed metal part has been demonstrated.
Furthermore, an effect that satisfies practicality is achieved.

In addition, it has the characteristics of a denture (not just a denture), but also the technique when setting it in the oral cavity, such as good VI construction and good deoxidizing effect, and in addition, it has good workability. It provides an optimal denture that is easy to soak and operate, and the effect of soaking is achieved by 1q.

Furthermore, since the gold content can be lower than palladium, it is cheaper and easier to obtain (the benefits for T4 treatment and the benefits for users and patients).
It also has the excellent effect of being connected to -.

Therefore, the elements added in trace amounts to the base alloy can also promote the specific properties of the base alloy and promote energization.
Ranoni series Ryu II (to add L-, teeth!,
t as a palladium-gold alloy for J cli firing! ! The effect of t9 is that the characteristics can be made more +i1+-1 ni.

Claims (1)

[Claims] In a palladium-gold alloy for dental porcelain baking, in which other elements are added to a base alloy consisting of palladium, gold, antimony, and indium, the weight mixing ratio of the base material is 30 to 75% palladium and 10 to 60% gold. , antimony 1-2
5%, indium 0.5-15%, and the other additive elements mentioned above and their blended weight ratios are gallium 0.01-10%.
%, tin 0.01-10%, iron 0.1-5%, iridium 0.01-1%, and at least one of these additive elements is added to the above base alloy. A palladium-gold alloy for dental porcelain baking.