JP2001220629A - Silver-indium series alloy for dental casting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an improving technique for a corrosion resistant and discoloring resistant silver-indium series alloy for dental treatment, particularly, for casting for the repair of crowns, hooks, bars and metal denture base having high proof stress, high ductility or the like and excellent in aesthetic properties. SOLUTION: In this silver-indium series alloy for dental casting which can also be applied for decoration and tableware, to an alloy composed of, by weight, 1 to 30% indium, 0.01 to 20% zinc, 0.01 to 15% tin, 60 to 90% silver and <=20% platinum group elements, any of 0.01 to 4% nickel, 0.01 to 3% molybdenum, 0.01 to 1% tungsten, 0.01 to 2% yttrium, 0.01 to 2% silicon, 0.01 to 5% copper, 0.01 to 3% chromium, 0.001 to 5% gold and 0.01 to 4% cobalt of suitable quantity is individually or jointly added to improve its mechanical properties, particularly, in elongation, tensile strength and proof stress, so that its discoloring resistance in the mouth is made higher than that of the conventional silver-indium series alloy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is for dental applications, in particular for crown restorations and castings for hooks, bars and metal floors, and
Corrosion resistance excellent in high proof stress, high ductility, etc. and aesthetics, relates to the improvement technology of discoloration resistant silver-indium alloy, specifically nickel, molybdenum, tungsten, yttrium, silicon, cobalt, copper, chromium,
By adding an appropriate amount of two or more elements of gold together, the mechanical properties such as tensile strength, proof stress, and elongation of the alloy are improved, and the corrosion resistance and discoloration resistance are also improved. The present invention relates to a technology characterized by enhanced characteristics.

[0002]

2. Description of the Related Art Dental alloys, particularly hooks and bridge alloys, have so-called physical and chemical properties such as physical, chemical and mechanical properties necessary for the purpose of use, and have virtually no effect on the human body. That is, it is necessary to have no harmfulness, and furthermore, it is generally necessary that the material is generally excellent in so-called aesthetics, such as being beautiful. It is greatly demanded that it be excellent in operability such as easy operation.

Due to the above-mentioned required characteristics, high-carat gold-based alloys have been awarded since ancient times. However, gold is an international speculative product, is very expensive, and its price fluctuation is extremely remarkable. In addition, various drawbacks have been pointed out, such as the required mechanical strength and hardness, etc., which are somewhat lacking in terms of characteristics, and which are heavy and have a poor fit.

On the other hand, non-precious metal alloys such as cobalt and nickel-chromium alloys are extremely inexpensive, have high strength and are excellent, but conversely have a high melting point, and have poor castability and workability.
Many of them have difficulty in operability, and furthermore, nickel-chromium-based alloys have been pointed out to be disadvantageous in view of harmfulness.

[0005] In contrast to the above-mentioned alloys, silver alloys, which are also noble metals, have no harm, are reasonably beautiful, and are not as expensive as gold alloys. Recently, various silver alloys have been developed that have been improved in mechanical strength, discoloration resistance, corrosion resistance, etc., and some of them have been developed in JIST6.
Currently, it is also used as a silver alloy for dental casting of No. 108 and is also an alloy applicable to health insurance. One of the present inventors has previously proposed a silver / indium alloy for dental crown restoration casting in Japanese Patent Publication No. 6-65730.

[0006]

In order to be able to use a silver-based alloy as an alloy for crown restorations and hooks, essential problems of the base alloy, namely, poor corrosion resistance, especially discoloration resistance, and poor mechanical properties. The biggest challenge is to overcome the two points of low strength. One method for this purpose is a silver-palladium alloy, but it is difficult to achieve a balance between reasonable science and engineering properties and operability, discoloration resistance, and economic efficiency, and no satisfactory results have yet been obtained.

[0007] In this regard, the silver-indium alloy is an alloy in which economy, operability, science and engineering properties, etc. are appropriately balanced, and the alloy of Japanese Patent Publication No. 6-65730 belongs to this alloy. And there are currently several alloys on the market that are considered this system.

[0008] However, even with this silver-indium alloy, it is considered that the properties are still insufficient, because the elongation value is not sufficient, and the elongation of this alloy currently on the market is less than 4%. Most of the alloys are brittle alloys. And if it tries to improve this extensibility, proof stress, corrosion resistance, discoloration resistance will be reduced, or operability will be poor, and eventually it will be a gold alloy or an alloy containing a considerable amount of gold. This is the actual situation.

As is apparent from the above, the most desired silver-indium alloy for dental casting which is more useful as it is used as a material for health insurance is the current silver / indium alloy. While maintaining excellent operability, corrosion resistance, discoloration resistance, innocuousness, and economic efficiency of indium-based alloys, mechanical strength, especially proof stress and elongation, are further improved, and if possible, more excellent aesthetics Alloy.

[0010]

SUMMARY OF THE INVENTION The alloy of the present invention has been developed to meet the above-mentioned requirements, and the constituent components thereof are as follows. Indium 1 to 30% by weight Zinc 0.01 to 20% Tin 0.01 to 15% Silver 60 to 90% Platinum group element 5% or less Nickel 0.01 to 4% Copper 0.01 to 5% Molybdenum 0.01 to 3% Chromium 0.01-3% Tungsten 0.01-1% Gold 0.001-5% Yttrium 0.01-2% Cobalt 0.01-4% Silicon 0.01-2% is added to improve mechanical properties, especially tensile strength, proof stress and discoloration resistance A silver / indium alloy for dental casting, characterized in that it is made to be used.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The liquidus point of these alloys is 700
℃, and the operability such as melt casting, cutting, and polishing is not much different from that of the conventional silver / indium alloy, and the tensile strength is 460 MPa and the proof stress is 380.
An alloy with an MPa higher than that of the current product was obtained, and the discoloration resistance in the oral cavity was further improved as compared with the current product.

The components of the alloy of the present invention and the reasons for limiting the components are as follows. A silver-indium alloy which is the basis of the present invention has recently been known for restoration of a crown. This is because the lack of tensile strength, proof stress and discoloration resistance, which are the most frequent problems with silver-based alloys, is due to the high tensile strength, high proof stress and discoloration resistance only by adding an appropriate amount of indium, that is, 1 to 30% by weight. Therefore, nickel, molybdenum, tungsten, yttrium, silicon, cobalt, copper, chromium, gold and the like were further added.
However, if the amount of nickel, molybdenum, tungsten, yttrium, zirconium, cobalt, iridium, platinum, ruthenium, palladium, osmium, rhenium, etc. is small in addition to indium, the required strength and discoloration resistance cannot be obtained, and sodium sulfide / lactic acid Other test solutions and discoloration and corrosion in the oral cavity, while on the other hand, if the amount of indium is large, the mechanical properties, especially the proof stress, are reduced, and the material becomes brittle. (Molten flow) is also deteriorated and castability is impaired. Therefore, it is customary to set the upper limit to 30% by weight and limit the range of indium to 1 to 30% by weight.

[0013] Zinc is added as an effective element for deoxidizing this kind of alloy. However, if the addition is too small, the effect of deoxidation cannot be obtained, and if it is too much, the flow of the alloy becomes poor. As a result, the castability is reduced and the toughness and color tone of the alloy are impaired. or,
Tin was set to 0.01 to 15% in order to improve operability.

Nickel, molybdenum, tungsten, yttrium, silicon, cobalt, copper, chromium, and gold added to the silver-based alloy improve the mechanical strength of the alloy, particularly, the flexibility, spring property, and elongation. Remarkably improved, and also contributed to the improvement of corrosion resistance such as sulfidation resistance and discoloration resistance,
And help maintain the color of the alloy silver in the oral cavity for a long period of time, nickel, molybdenum, tungsten, yttrium, silicon, cobalt, copper, chromium,
It was recognized that the effect was clarified by adding an appropriate amount of any two or more elements of gold together.

However, their addition is limited, and when the addition amount is too small, the effect of the addition is not recognized. On the other hand, when the addition amount exceeds a certain level, the properties are deteriorated, that is, the bending property, spring property, As an effective addition range, nickel elongation decreases, brittleness develops, melting point rises, etc.
0.01-4 wt%, molybdenum 0.01-3 wt%, tungsten 0.01-3 wt%, yttrium 0.01-2 wt%, silicon 0.01-2 wt%, cobalt 0.01-4 wt%, copper 0.01- 5% by weight, chromium 0.01-3% by weight,
Gold was 0.001 to 5% by weight.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail.

[0017]

[Table 1]

[0018]

[Table 2]

High purity silver, indium, zinc, tin, platinum, osmium, nickel, molybdenum, tungsten, yttrium, silicon, cobalt, copper, chromium,
Gold was prepared as a raw material, and the alloy having the composition shown in Table 1 was melted using a crypt furnace. Among these alloys, No. 1 to
No. 6 is an alloy of the present invention. 7 is a current representative alloy.

The measurement results of various properties of these alloys are also shown in Table 2. As is clear from the above, the alloy of the present invention is harder than the current silver-indium alloy, has significantly higher tensile strength, proof stress, and elongation, and a remarkable improvement in the spring property required for casting hooks is recognized. .

Although no significant difference was found in the discoloration resistance and corrosion resistance by the JIS method, hooks and crowns were prepared and tried to be worn in the oral cavity. 1-6
The alloy has a silver color that is clearly recognized, and the currently used No. It had a more pleasant, glossy and bright color tone than the alloy No. 7, and was well received by the testees, and did not show any signs of corrosion. In addition,
The workability and operability of the prosthesis preparation were no different from the current silver alloy, and were recognized as good by the workers.

From these results, it has been clarified that the alloy of the present invention sufficiently achieves the above objects and effects, and is preferable as an alloy for dental casting.

[0023]

As described above, the alloy according to the present invention has:
Among the characteristics of silver and indium alloys, corrosion and discoloration resistance, mechanical properties, especially proof stress and spring properties, are improved, and the color of white gold alloy is highly aesthetic. It is possible to provide a useful silver / indium alloy which can be applied to a casting alloy for a hook or a coupling device and has high economic efficiency.

[Procedure amendment]

[Submission date] February 7, 2000 (2000.2.7)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction contents]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for dental use, particularly for restoration of crowns and casting for hooks, bars, and metal floors, and is excellent in corrosion resistance and corrosion resistance excellent in high yield strength, high ductility, etc. and aesthetics. Discolorable silver
It is related to the improvement technology of indium alloy, and in detail, nickel, molybdenum, tungsten,
By adding an appropriate amount of yttrium, silicon, cobalt, copper, chromium, or gold alone or together, the mechanical properties such as tensile strength, proof stress and elongation of the alloy are improved, and furthermore, corrosion resistance and resistance The present invention relates to a technique characterized by improving discoloration and improving aesthetics.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

Nickel, molybdenum, tungsten, yttrium, silicon, cobalt, copper, chromium, and gold added to the silver-based alloy improve the mechanical strength of the alloy, particularly, the flexibility, spring property, and elongation. Remarkably improved, and also contributed to the improvement of corrosion resistance such as sulfidation resistance and discoloration resistance,
And help maintain the color of the alloy silver in the oral cavity for a long period of time, nickel, molybdenum, tungsten, yttrium, silicon, cobalt, copper, chromium,
It was observed that the effect was clarified by adding any appropriate amount of gold alone or together. ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] March 22, 2000 (200.3.2)
2)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Silver / Indium alloy for dental casting

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is for dental applications, in particular for crown restorations and castings for hooks, bars and metal floors, and
Corrosion resistance excellent in high proof stress, high ductility, etc. and aesthetics, relates to improvement technology of discoloration-resistant silver-indium alloy, specifically nickel, molybdenum, tungsten, yttrium, silicon, cobalt, copper, chromium,
By adding any appropriate amount of gold alone or together, the mechanical properties such as tensile strength, proof stress and elongation of the alloy are improved, and the corrosion resistance and discoloration resistance are further improved, resulting in aesthetics. To a technology characterized in that the

[0002]

2. Description of the Related Art Dental alloys, particularly hooks and bridge alloys, have so-called physical and chemical properties such as physical, chemical and mechanical properties necessary for the purpose of use, and have virtually no effect on the human body. That is, it is necessary to have no harmfulness, and furthermore, it is generally necessary that the material is generally excellent in so-called aesthetics, such as being beautiful. It is greatly demanded that it be excellent in operability such as easy operation.

Due to the above-mentioned required characteristics, high-carat gold-based alloys have been awarded since ancient times. However, gold is an international speculative product, is very expensive, and its price fluctuation is extremely remarkable. In addition, various drawbacks have been pointed out, such as the required mechanical strength and hardness, etc., which are somewhat lacking in terms of characteristics, and which are heavy and have a poor fit.

On the other hand, non-precious metal alloys such as cobalt and nickel-chromium alloys are extremely inexpensive, have high strength and are excellent, but conversely have a high melting point, and have poor castability and workability.
Many of them have difficulty in operability, and furthermore, nickel-chromium-based alloys have been pointed out to be disadvantageous in view of harmfulness.

[0005] In contrast to the above-mentioned alloys, silver alloys, which are also noble metals, have no harm, are reasonably beautiful, and are not as expensive as gold alloys. Various silver-based alloys have recently been developed that have been improved in mechanical strength, discoloration resistance, corrosion resistance, etc., and have recently been attracting attention as alloys for fixed dentures for crown restorations.
Currently, it is also used as a silver alloy for dental casting of No. 108 and is also an alloy applicable to health insurance. One of the present inventors has previously proposed a silver / indium alloy for dental crown restoration casting in Japanese Patent Publication No. 6-65730.

[0006]

In order to be able to use a silver-based alloy as an alloy for crown restorations and hooks, essential problems of the base alloy, namely, poor corrosion resistance, especially discoloration resistance, and poor mechanical properties. The biggest challenge is to overcome the two points of low strength. One method for this purpose is a silver-palladium alloy, but it is difficult to achieve a balance between reasonable science and engineering properties and operability, discoloration resistance, and economic efficiency, and no satisfactory results have yet been obtained.

[0007] In this regard, the silver-indium alloy is an alloy in which economy, operability, science and engineering properties, etc. are appropriately balanced, and the alloy of Japanese Patent Publication No. 6-65730 belongs to this alloy. And there are currently several alloys on the market that are considered this system.

[0008] However, even with this silver-indium alloy, it is considered that the properties are still insufficient, because the elongation value is not sufficient, and the elongation of this alloy currently on the market is less than 4%. Most of the alloys are brittle alloys. And if it tries to improve this extensibility, proof stress, corrosion resistance, discoloration resistance will be reduced, or operability will be poor, and eventually it will be a gold alloy or an alloy containing a considerable amount of gold. This is the actual situation.

As is apparent from the above, the most desired silver-indium alloy for dental casting which is more useful as it is used as a material for health insurance is the current silver / indium alloy. While maintaining excellent operability, corrosion resistance, discoloration resistance, innocuousness, and economic efficiency of indium-based alloys, mechanical strength, especially proof stress and elongation, are further improved, and if possible, more excellent aesthetics Alloy.

[0010]

SUMMARY OF THE INVENTION The alloy of the present invention has been developed to meet the above-mentioned requirements, and the constituent components thereof are as follows. Indium by weight: 1-30% Zinc: 0.01-20% Tin: 0.01-15% Silver: 60-90% Platinum group element: 20% or less Nickel: 0.01-4% Copper: 0.01-5% Molybdenum: 0.01-3% Chromium 0.01-3% Tungsten 0.01-1% Gold 0.001-5% Yttrium 0.01-2% Cobalt 0.01-4% Silicon 0.01-2% is added to improve mechanical properties, especially tensile strength, proof stress and discoloration resistance A silver / indium alloy for dental casting, characterized in that it is made to be used.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The liquidus point of these alloys is 700
℃, and the operability such as melt casting, cutting, and polishing is not much different from that of the conventional silver / indium alloy, and the tensile strength is 460 MPa and the proof stress is 380.
An alloy with an MPa higher than that of the current product was obtained, and the discoloration resistance in the oral cavity was further improved as compared with the current product.

The components of the alloy of the present invention and the reasons for limiting the components are as follows. A silver-indium alloy which is the basis of the present invention has recently been known for restoration of a crown. This is because the lack of tensile strength, proof stress and discoloration resistance, which are the most frequent problems with silver-based alloys, is due to the high tensile strength, high proof stress and discoloration resistance only by adding an appropriate amount of indium, that is, 1 to 30% by weight. Therefore, nickel, molybdenum, tungsten, yttrium, silicon, cobalt, copper, chromium, gold and the like were further added.
However, if the amount of nickel, molybdenum, tungsten, yttrium, zirconium, cobalt, iridium, platinum, ruthenium, palladium, osmium, rhenium, etc. is small in addition to indium, the required strength and discoloration resistance cannot be obtained, and sodium sulfide / lactic acid Other test solutions and discoloration and corrosion in the oral cavity. On the other hand, when the amount of indium is large, the mechanical properties, particularly the proof stress, are reduced, and the material becomes brittle. (Molten flow) is also deteriorated and castability is impaired. Therefore, it is customary to set the upper limit to 30% by weight and limit the range of indium to 1 to 30% by weight.

[0013] Zinc is added as an effective element for deoxidizing this kind of alloy. However, if the addition is too small, the effect of deoxidation cannot be obtained, and if it is too much, the flow of the alloy becomes poor. As a result, the castability is reduced and the toughness and color tone of the alloy are impaired. or,
Tin was set to 0.01 to 15% in order to improve operability.

Nickel, molybdenum, tungsten, yttrium, silicon, cobalt, copper, chromium, and gold added to the silver-based alloy improve the mechanical strength of the alloy, particularly, the flexibility, spring property, and elongation. Remarkably improved, and also contributed to the improvement of corrosion resistance such as sulfidation resistance and discoloration resistance,
And help maintain the color of the alloy silver in the oral cavity for a long period of time, nickel, molybdenum, tungsten, yttrium, silicon, cobalt, copper, chromium,
It was observed that the effect was clarified by adding any appropriate amount of gold alone or together.

However, their addition is limited, and when the addition amount is too small, the effect of the addition is not recognized. On the other hand, when the addition amount exceeds a certain level, the properties are deteriorated, that is, the bending property, spring property, As an effective addition range, nickel elongation decreases, brittleness develops, melting point rises, etc.
0.01-4 wt%, molybdenum 0.01-3 wt%, tungsten 0.01-3 wt%, yttrium 0.01-2 wt%, silicon 0.01-2 wt%, cobalt 0.01-4 wt%, copper 0.01- 5% by weight, chromium 0.01-3% by weight,
Gold was 0.001 to 5% by weight.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail.

[0017]

[Table 1]

[0018]

[Table 2]

High purity silver, indium, zinc, tin, platinum, osmium, nickel, molybdenum, tungsten, yttrium, silicon, cobalt, copper, chromium,
Gold was prepared as a raw material, and the alloy having the composition shown in Table 1 was melted using a crypt furnace. Among these alloys, No. 1 to
No. 6 is an alloy of the present invention. 7 is a current representative alloy.

The measurement results of various properties of these alloys are also shown in Table 2. As is clear from the above, the alloy of the present invention is harder than the current silver-indium alloy, has significantly higher tensile strength, proof stress, and elongation, and a remarkable improvement in the spring property required for casting hooks is recognized. .

No significant difference was found in the discoloration resistance and corrosion resistance by the JIS method. However, as a result of preparing hooks and crowns and fitting them in the oral cavity, the results were as follows in about one month. 1-6
The alloy has a silver color that is clearly recognized, and the currently used No. It had a more pleasant, glossy and bright color tone than the alloy No. 7, and was well received by the testees, and did not show any signs of corrosion. In addition,
The workability and operability of the prosthesis preparation were no different from the current silver alloy, and were recognized as good by the workers.

From these results, it has been clarified that the alloy of the present invention sufficiently achieves the above objects and effects, and is preferable as an alloy for dental casting.

[0023]

As described above, the alloy according to the present invention has:
Among the characteristics of silver and indium alloys, corrosion and discoloration resistance, mechanical properties, especially proof stress and spring properties, are improved, and the color of white gold alloy is highly aesthetic. It is possible to provide a useful silver / indium alloy which can be applied to a casting alloy for a hook or a coupling device and has high economic efficiency. ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] June 2, 2000 (2006.2)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0023

[Correction method] Change

[Correction contents]

[0023]

As described above, the alloy according to the present invention has:
Among the characteristics of silver and indium alloys, corrosion and discoloration resistance, mechanical properties, especially proof stress and spring properties, are improved, and the color of white gold alloy is highly aesthetic. It can be applied to products that come into contact with the human body, such as casting alloys for hooks and connecting devices, ornaments, tableware, etc., and can provide useful silver-indium alloys that are also highly economical. is there.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Osamu Tsujimoto 4-6-13 Chuo, Warabi-shi, Saitama F-term (reference) 4C089 AA09 BB06 CA06

Claims (1)

[Claims] 1. Indium by weight 1-30% Zinc 0.01-20% Tin 0.01-15% Silver 60-90% Platinum group element 5% or less Nickel 0.01-4% Copper 0.01-5% Molybdenum 0.01 to 3% Chromium 0.01 to 3% Tungsten 0.01 to 1% Gold 0.001 to 5% Yttrium 0.01 to 2% Cobalt 0.01 to 4% Silicon 0.01 to 2% is added to add mechanical properties, especially elongation and tensile strength. A silver / indium alloy for dental casting, characterized by improved proof stress and higher discoloration resistance in the mouth than conventional silver / indium alloys.