JPS6256544A - Palladium alloy for baking dental ceramic material - Google Patents

Abstract

PURPOSE:To obtain the titled inexpensive alloy excellent in elastic modulus, coefficient of thermal expansion, strength, high-temp. characteristics, castability, melting point, etc., and having superior property of bonding to ceramic materials by providing a specific composition by adding Ga, In, Sn, Au, etc., to a base alloy consisting of Pd and Sb. CONSTITUTION:A Pd alloy for baking dental ceramic material can be obtained by further adding, by weight, one or more kinds among 0.01-10% Ga, 0.5-15% In, 0.5-15% Sn and 0.01-10% Au to the base alloy consisting of 50-90% Pd and 1-25% Sb. The above alloy combines various superior mechanical and chemical properties with sanitary and aesthetic advantages and moreover it is inexpensive and easy to obtain as it is reduced in Au content.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The disclosed technology belongs to the technical field of the composition of dental porcelain baking alloys for baking porcelains in dental healing treatments.

<Summary of the gist> This invention provides a dental porcelain baking method in which a base alloy consisting of palladium and antimony contains trace amounts of other additive elements in a blended weight ratio to improve porcelain baking. This invention relates to a palladium alloy for use in metals, and in particular, the weight ratio of the base alloy is 50 to 90% palladium and 1 to 2% antimony.
The alloy has a composition of 5% gallium, and trace amounts of elements added to this base alloy and their blended weight ratios range from 0.01 to gallium.
10%, indium 0.5-15%, tin 0.5-15
%, gold 0.01 to 10%, at least one of these trace elements is added to the base alloy to selectively promote the porcelain baking properties. This is such an invention.

<Prior art> As is well known, various treatment methods and means have been developed in dental treatment, but there is a technology that replaces the defective part of the tooth, such as the crease, so that it can perform its original function. Various techniques for wearing dentures have been used since ancient times.

Therefore, dentures have physical aspects that allow them to fulfill their functions, chemical aspects that deal with changes in properties during use, hygiene during use, and aesthetic aspects that greatly affect psychological aspects. These three points are no longer ignored as constraints on healing and technique, and these three conditions are basically @
To achieve this, a technology has been adopted that involves baking porcelain on the surface of a metal body, mainly made of C alloy, to integrate it. Among them, the alloy is known as a so-called porcelain baking alloy.

Therefore, as a matter of course, the basic conditions for the important porcelain baking alloy that restrict the basic functions of such dentures include the mechanical properties of the porcelain to match the properties of the alloy to be bonded. Although it is hard, there are two conditions: to compensate for the brittle Meibs surface as much as possible with alloys and metals, and there are conditions for strong chemical integration to bond the two in the first place.

Therefore, the elastic modulus of the alloy is high against the pressure applied during repeated occlusal chewing in the oral cavity, and the coefficient of thermal expansion of the porcelain and alloy during baking is also low. Furthermore, the chemical properties of both during firing are higher than the merging point or the firing temperature of the porcelain, and the mutual bonding strength between the metal molecules of the porcelain and the alloy after firing. It is necessary to have a large amount of power.

The US-based dental porcelain baking alloys that have been developed so far can be roughly divided into noble metal alloys containing gold as a main component, palladium and silver alloys containing silver as a main component, and nickel, nickel, and silver alloys. It is classified as a non-precious metal alloy mainly composed of chromium and cobalt.

<Problems to be solved by the invention> Therefore, among conventional dental porcelain baking alloys, noble metal alloys mainly composed of gold are naturally expensive due to the fact that gold constitutes the main component. It has the disadvantage of being expensive, and since it is mainly made of gold, it has a low hardness value, so it is soft as an alloy for baking dental porcelain and cannot withstand the force applied during occlusion during chewing. There is a disadvantage that the porcelain bonded by repeating fibers may peel off, and its strength against high temperatures is weak, causing the alloy to deform during the porcelain firing process and meet basic requirements. There was a rare problem that the product did not match.

In addition, palladium-silver alloys, which have silver as their main component, have the advantage of being cheaper in terms of cost and having a higher hardness value than the above-mentioned noble metal alloys because they do not contain gold, but they are still difficult to eat. In addition, the hardness is not ideal enough to withstand the occlusal pressure during porcelain firing. There is the disadvantage that the aesthetics, which is an excellent feature, is lost.

Non-noble metal alloys are the cheapest in terms of cost, and have excellent hardness and high-temperature strength, but due to dental treatment techniques, they have poor castability, and the main content of the elements Oxides of the ingredients are likely to form, and therefore, the porcelain becomes discolored during firing, resulting in poor aesthetics as an oral cavity material.Furthermore, the bonding strength with the porcelain is insufficient.

The purpose of this invention is to solve the problems of dental porcelain baking alloys based on the above-mentioned prior art. It also has excellent chemical properties such as castability, melting point, etc., and has a history of producing dental porcelain baking alloys that have excellent bonding properties with porcelain materials, and has been used in the health and hygiene industry to utilize dental healing treatment technology. The purpose of this invention is to provide an excellent palladium alloy for baking dental porcelain materials that will benefit the field.

<Means/effects for solving the problems> In accordance with the above-mentioned purpose, the structure of the present invention, which is summarized in the claims of the above patents, is to solve the problem of durability. As a palladium alloy for industrial use, it basically matches the thermal expansion coefficient with porcelain, and when fired with porcelain, its melting point is higher than the firing temperature of porcelain, improving the bond and compatibility between the two, and making history. In order to prevent intraoral C discoloration and corrosion, the weight ratio of Balan 1 cum as the base alloy is 50 to 50.
90%, and added to anti-tin (not only to improve compatibility with the porcelain material, but also to improve castability, it does not cause coloring to the porcelain material, and provides an aesthetically healthy color). The weight ratio should be 1 to 5% so as not to reduce the weight.
In order to selectively and selectively improve the properties of the base alloy with this composition, the bonding force with the porcelain is increased, and an aesthetically healthy color is reproduced in the gingival area in the oral cavity. Other trace elements added to provide a deoxidizing effect, improve mechanical properties, improve castability, and prevent alloy embrittlement, and their weight ratios range from 0.01 to potassium. 1
0%, indium 0.5-15%, tin 0.5-15%
, 0.01 to 10% gold, and at least one of these trace elements is added as a blended metal, thereby taking technical measures to improve and promote the above-mentioned properties.

<Theoretical Composition Background> Next, we will discuss the qualitative composition of each component and its weight ratio in the palladium alloy for dental porcelain baking, which constitutes the gist of this invention, and the theoretical background of quantitative limitations and experimental limitations of conditions. Let me explain the background.

That is, regarding the base alloy, first, palladium is used as a material for dental healing treatment to ensure sufficient bonding and compatibility with porcelain, and therefore, it has the same coefficient of thermal expansion as that of porcelain. However, it is necessary to make the melting point of the alloy higher than the firing temperature of the porcelain, and as mentioned above,
It is a basic metal that is necessary to ensure sufficient corrosion resistance without discoloring or dissolving in the oral cavity after being worn.
This weight ratio was is limited to 50-90%.

Next, antimony is added to improve castability and IJJ compatibility, so when a denture is worn in the mouth, exposed metal parts generally appear around the tongue. However, it is necessary to aesthetically reproduce a healthy color in the gum area of the relevant area, to ensure that the design is not bad, and to prevent coloring or discoloration of the porcelain. It has been experimentally confirmed that if the weight ratio of antimony is less than 1%, the effect cannot be expected, and if the weight ratio of antimony is 25% or more, the good function will be lost. is 1 to 25 in weight ratio
% is defined as the optimum addition range.

Regarding the additive elements to the above alloy, gallium has the function of deoxidizing the alloy, and also forms a moderate oxide film on the alloy surface to strengthen the bond with the porcelain. When the denture is worn in the oral cavity, it effectively reproduces a healthy color that does not impair the aesthetics of the gingival area of the exposed metal area around the tongue, and also causes discoloration of the porcelain material, which improves the aesthetics. It is necessary to prevent the deterioration, and these excellent effects can be expected when the weight ratio is o, oi
The weight ratio is limited to 0.01 to 10%, and if it is less than 0.01%, no effect can be expected, and if it exceeds 10%, the castability and compatibility will deteriorate, so the weight ratio is limited to 0.01 to 10%. This is what I did.

Next, indium is used in the oral cavity (to improve elasticity against the force applied during occlusion during chewing) and to improve mechanical properties, while it also improves mechanical properties when bonded to porcelain. Forms a moderately thin oxide film, and also improves castability and
It acts to improve compatibility and to fully exhibit these properties, it is necessary to add at least 0.5% by weight; on the other hand, if it is added in excess of 15%, the high temperature properties deteriorate. It has been experimentally confirmed that the alloy deteriorates and the alloy becomes brittle.
Therefore, the IT ratio of indium must be within a limited range of 0.5-15%.

Like indium, tin is added to improve the mechanical properties against the applied force during chewing and chewing, and like palladium, it is added to strengthen the bonding force with porcelain. For example, if the weight ratio is less than 0.5%, the effect is weak, and if it exceeds 15o3, it becomes brittle and undesirable, so the weight ratio is limited to 0.5 to 15%.

Regarding gold, it has the function of matching the coefficient of thermal expansion with porcelain, improving the bonding property with porcelain, and improving casting resistance, and according to experiments, the weight ratio is 0.01
If it is less than 10%, no effect can be expected, while if it exceeds 10%, the hardness value will be low and there will be a disadvantage that the cost will be high.

Therefore, for gold, the weight ratio is 0.01 to 10
%.

<Examples> Next, Examples of the present invention are shown in Table 1 below in terms of composition/blending ratio (wt%) together with known alloy examples.

Table 1: Comparative examples of the relevant Table 1, sample numbers @1 to 17,
For the known alloy with sample number @18.19, 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 t10 x w50 Xi) 1
It was cast into a shape of 00m, and then rolled into a predetermined shape using a well-known rolling roll.

The processed materials of each of the samples obtained as described above and the known samples were then cast using a centrifugal casting method to obtain t 1.0XW.
A desired number of plate-shaped specimens of 10×115 mm were formed and a hardness test was conducted.

Also, φ2. A rod-shaped test piece with a length of 50 m was prepared and subjected to a tensile test and an elongation measurement test.

The content of each test is as follows.

1) Hardness Test The hardness was measured using a micro Vickers hardness tester 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 gage length of 20 mrn was measured using a Tensilon tensile tester at a tensile speed of 10 m/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, 400 as specified in JIS-R 6253.
After polishing with sandpaper, one type of specimen was 37±2
The state of discoloration was observed after being completely immersed for 3 days in a 0.1% sodium sulfide solution at °C.

For other types of test pieces, 0.1% at 37±2℃
The state of discoloration was observed after being completely immersed for 3 days in a mixed solution containing sodium sulfide and 1% lactic acid.

5) Porcelain discoloration observation test After porcelain was baked on each test piece, the presence or absence of discoloration of the porcelain was observed.

The results of each of the above tests are shown in Table 2 below.
In the discoloration test results shown in the table, the ○ mark indicates that there was no change at all.

As can be seen from the test data shown in Table 2 above, the palladium alloy for dental porcelain firing of the present invention is significantly superior in hardness and tensile strength compared to conventional known alloys. There is no inferiority in elongation, and there is data that fully satisfies the special conditions for porcelain.
It is being questioned.

It goes without saying that the embodiments of this invention are not limited to the above-mentioned embodiments. For example, equivalent elements having the same functions and effects as the constituent elements of the preceding claims may be used. Various aspects can be adopted, such as those that can be used instead.

<Effects of the Invention> As described above, according to the present invention, basically, in an alloy for firing M-grade porcelain, the composition of the base alloy and the trace elements added thereto is first described in (e) the scope of the claims. By limiting the constituent requirements of
The excellent effect of being able to provide an alloy that is almost completely satisfactory in terms of aesthetics is achieved.

Therefore, even when set in the oral cavity,
The state of bonding with the porcelain material is sufficiently maintained over time, and
It maintains sufficient elasticity even against the mechanically repeated applied force of occlusion due to stress, prevents peeling of the porcelain, and protects the exposed metal part of the lingual periphery. It has the excellent effect of being able to reproduce and maintain an aesthetically pleasing gingival color.

In addition, the instep not only has excellent characteristics as a denture, but also has good casting properties when placed in the oral cavity, has a good deoxidizing effect, and provides an optimal denture that is easy to operate and has excellent workability. The excellent effect that can be achieved is Qin.

In addition, since it contains less gold, it has excellent effects in that it is inexpensive and easy to obtain, which is advantageous for dental treatment.

Since trace amounts of elements added to the base alloy can also promote the properties of the base alloy and promote its energization, the baking of dental porcelain can be improved by at least selectively adding these elements. This results in an excellent effect that can further improve the excellent properties of a palladium alloy for use.

Claims (1)

[Claims] In palladium alloys for dental porcelain baking, in which other elements are added to an alloy consisting of palladium and antimony,
The base alloy has a weight ratio of 50 to 90% palladium and 1 to 25% antimony, and 0% gallium to the base alloy.
．． 01-10%, indium 0.5-15%, tin 0.
A palladium alloy for baking dental porcelain, characterized in that at least one element is added in a weight ratio of 5 to 15% gold and 0.01 to 10% gold.