JPS58107438A - Low-carat baking alloy for dental use - Google Patents

Abstract

PURPOSE:To obtain the inexpensive titled alloy excellent in a mechanical property as use for baking ceramics, by adding limited amounts of In, Sn, Ir, Ru, Ag, Mo, Al, Ge, etc. to a base alloy having specified composition comprising Pd, Au, Ni and Pt. CONSTITUTION:The composition of a base alloy is made at 30-70wt% Pd, 5-30% Au, 5-30% Ni and 1-20% Pt to obtain an inexpensive alloy excellent in a high-temperature characteristic, the modulus of elasticity, a thermal expansion coefficient, castability, affinity to ceramics, etc. To said base alloy, one or more of 0.5-5% In, 0.5-5% Sn, 0.01-3% Ir, 0.01-3% Ru, 0.1-5% Ag, 0.1- 5% Mo, 0.1-1% Al and 0.1-1% Ge is added to enable to selectively improve said various properties.

Description

DETAILED DESCRIPTION OF THE INVENTION The disclosed technology belongs to the technical field of improving the bond between porcelain baking alloys and porcelain used in dental treatment.

Therefore, this invention relates to a dental low-karat baking alloy that improves porcelain baking by further containing additional elements in a predetermined blending ratio to a base alloy consisting of multiple metals including gold, in a predetermined blending ratio. In particular, the base alloys are palladium, gold, nickel, and platinum, each with a weight ratio of 30 to 70%.
5-30%.

5-3C1, 1-20 to have the basic characteristics of a porcelain baking alloy, and furthermore, the weight blending ratio of the additive alloy to this base alloy is 0.5-5% indium.

Tin 0.5-5%, iridium 0.01-3%, ruthenium 0.01-6%, silver 0.1-5%, molybdenum 0.
1-5%, Altanium 0.1-1%, Germanium O
, 1-jls, and at least one of the above-mentioned alloys is added thereto to selectively promote the above-mentioned characteristics.

As is well known, various techniques are used in dental treatment, and one of the widely used techniques is to remove the necessary amount of the affected part of the tooth to be treated and replace the defective part with an artificial denture. There is.

In this case, the general form of the denture to be worn is what is called a porcelain-baked alloy, which is a porcelain baked integrally on the metal surface. In order to fully function as a denture by combining different types of porcelain materials, one of the conditions is how to compensate for the disadvantages of porcelain baking alloys, such as the inherent hardness and brittleness of porcelain materials. It is necessary to satisfy two conditions, the other being how to maintain the bond with the metal.

As an alloy for porcelain baking that satisfies both of these conditions, first of all, the alloy has a high elastic modulus, which provides a cushioning effect and can absorb the brittleness of the porcelain.
A strong bond is ensured by having a thermal expansion V coefficient that matches the thermal expansion coefficient of the porcelain, and in order to be stable as an alloy, it is necessary to assume that the melting point of the alloy is higher than the firing temperature of the porcelain. It is.

Traditionally, porcelain baking alloys that meet these complex conditions and assumptions can be divided into noble metal-based alloys whose main component is gold, and non-precious metal-based alloys whose main components are nickel, chromium, and cobalt. However, there was a problem that it did not match the actual needs.

In other words, the former precious metal type has many advantages such as easy casting operation, excellent compatibility with the other material, and high seizure strength, but on the other hand, it has the disadvantage that its functional strength is not necessarily sufficient. This has the disadvantage of high costs, and in addition, it is difficult to secure materials because market prices are difficult to stabilize.

In addition, the latter non-metallic materials are inexpensive and can reduce costs, and have excellent mechanical properties and corrosion resistance, but on the other hand, they have a high melting point and are easily oxidized at high temperatures, and they also have the disadvantage of being difficult to cast. It has the disadvantage that it is difficult to distinguish between the two, and it also has the disadvantage of large solidification shrinkage.

Due to these circumstances, in reality, the technique of porcelain baking alloy as close to perfection as possible could not be carried out except in a systemized large-scale laboratory.

The purpose of this invention is to solve the technical problems of porcelain baked alloys based on the above-mentioned prior art, and to solve the problems of noble metal alloys with excellent castability and compatibility, and with non-noble metal alloys that are inexpensive and functional. The purpose of the present invention is to provide an excellent dental low-karat baking alloy that can be useful in the field of use of porcelain baking alloys in the dental treatment industry by skillfully polymerizing the porcelain baking alloys, which have excellent physical properties.

The structure of the present invention in accordance with the above-mentioned object is to solve the above-mentioned problems by setting the weight ratio of palladium, gold, nickel, and platinum to 60 to 70%, respectively.

5 to 30aIb, 5 to 30T, and 1 to 20% to ensure low cost, and furthermore, a base alloy with excellent high temperature properties, elastic modulus, thermal expansion, castability melting point, compatibility with porcelain, etc.
In contrast, indium and tin.

At least one of iridium, ruthenium, silver, molyzodene, aluminum, and germanium each from 0.5 to
5%, 0.5-5chi, 0.01-3%.

0.01-5 inches, 0.1-5 inches, 0.1-5 inches, 0.1
The gist of this paper is to take technical measures to selectively promote the above characteristics by adding as an additive compound metal in the range of ~1% and 0.1~1%.

The reasons for limiting the base alloy, additive elements, and their compounding ratios in this invention are as follows.

First, regarding the base alloy, palladium has corrosion resistance: it does not cause dissolution and discoloration under the conditions in which it is placed in the oral cavity as a 4-teeth, and its melting point as a porcelain baking alloy is higher than the firing temperature of porcelain. It is essential to maintain these functions, and it has been experimentally shown that it does not work effectively below 30%, and that when it exceeds 70%, the melting point increases and castability deteriorates. Therefore, the optimum weight ratio was determined to be 60-70%.

Next, gold is necessary to strengthen the bonding force with the porcelain material, and it is also known that it is useful for improving mechanical strength. On the other hand, if it exceeds 30%, the seizure strength becomes unstable and the cost increases, so it is set at 5 to 50%.

Nickel is completely dissolved in solid solution with the palladium mentioned above, and its melting point is approximately 1240°C in a 40% Wt nickel-palladium alloy, and its thermal expansion is similar to that of porcelain, so it is effective to maintain a strong bond with porcelain. It is necessary to satisfy the characteristics of be.

Finally, platinum is effective in reducing the thermal expansion of the alloy as much as possible to strengthen the alloy, and it has been experimentally found that a range of 1 to 20 inches is most effective.

Regarding the additive elements to the above-mentioned base alloys, experiments have shown that both indium and tin can form oxide films on the alloy surface to improve the physicochemical bond with the porcelain (and also have a deoxidizing effect on the material). The above has been confirmed, and the combination ratio of electric switches that achieves the optimum action and effect is 0.5 to 5% each.
It has been experimentally confirmed that ζ is within the range of .

Next, regarding iridium, the addition of iridium significantly promotes the refinement of alloy crystals, and if the amount added is less than 0.01%, the effect is extremely weak. If it exceeds 0.0, it tends to become brittle.
A range of 1 to 6% has been set as the most preferable range. It is known that it is effective for dogs, and if the amount added is less than 0.01%, the effect is weak, and on the other hand, if it exceeds 3%, it becomes brittle, so experimental data shows that 0.0%.
The optimum addition amount is 1 to 3 inches.

Next, regarding the addition of silver, it improves castability, and although the amount added is small, it has an excellent effect of controlling changes in thermal expansion.If the amount added is less than 0.1 inch, it has no effect. On the other hand, if it exceeds 5%, a reaction with the porcelain occurs when silver is oxidized, so the optimal effective range is 0.1 to 5%.
%.

The addition of molybdenum does not only improve mechanical properties, but also has the advantage of forming a moderately hardened film on the metal surface and deoxidizing the material.
This oxide is white and has the effect of suppressing the formation of nickel black oxide that occurs during the baking process, making it preferable for intracavity set internal dentures.
Experimentally, it was determined that the most effective additive weight ratio was 0.1 to 5 inches (11.0 x W10
A necessary number of plate-shaped test pieces of X115 were prepared, and the following hardness tests, color tone observations, and discoloration tests were conducted.

Also, by the same centrifugal casting method, φ2. OXl 50mi
+ rod-shaped test pieces were prepared and subjected to a tensile test, an elongation measurement test, and a thermal expansion coefficient measurement test.

Contents of each test (1) Hardness test Using a micro Vickers hardness meter, measurements were made under conditions of a load of 200 g and a loading time of 30 seconds.

(2) Structure observation test The sample surface polished with emery paper and diamond paste was corroded with aqua regia, and the structure was observed using an optical microscope.

(3) Surface color observation test The test piece was subjected to all the heat treatment processes used in porcelain baking, and the color at the final stage was JIS.

JIS-Z・872 using the standard color chart specified by Z・8721
Observe the surface color tone using the specified surface color comparison method.

(4) Discolored deafness observation test After thoroughly polishing the test piece with JIS-R 6253 regulation (7) No. 400 test paper, one type of test piece is 37
For other types of specimens, they were fully immersed and partially immersed in a 0.1% sodium sulfide and 1% lactic acid mixed solution at 67±2°C in a 0.1 l-IJium sulfide solution at ±2°C. Observe the state of discoloration.

(5) Tensile strength test A tensile test piece (20 mm) was pulled at a tensile speed of 1
Measurement was performed using a Tensilon tensile tester at 0 mm/m.

(6) Elongation measurement test Same as above (force thermal expansion coefficient test Compression load determined) Measurement was carried out using a mechanical analyzer at a load of 5 g and a heating rate of 10°C/.

The results of each of the above tests are shown in Table H below.

Note that the ○ marks in the above discoloration test indicate that there was no change at all, and the test material A in Table 1 [
Regarding D and G, A: #Made material (cast material) D = Daygassing treated material (softened and detreated material) G:
Regarding the glazed material (those that have passed the final porcelain baking process) and the results of the discoloration test: 0.1% sodium sulfide solution 0: A mixture of 0.1% sodium sulfide solution and 1% lactic acid. 7/' Table ■ Test dates shown in Table 2 above As shown, the baked alloy of the present invention not only has much superior mechanical properties such as hardness and tensile strength, but also has a higher elongation. It has also been demonstrated that it has much better cushioning properties at porcelain firing temperatures (in contrast, it has a higher melting point than conventional alloys).

Furthermore, the coefficient of thermal expansion is not significantly different from that of conventional alloys, indicating that the bonding state with the porcelain material can be maintained well.

It goes without saying that various embodiments of the present invention are possible in combinations other than those shown in Table 1 above.

As described above, according to the present invention, the base alloy used as the denture metal in the dental low-karat baking alloy is made to have the composition and blending ratio as claimed in the claims, thereby achieving low cost while improving mechanical properties and high-temperature properties. Excellent properties, good elastic modulus and thermal expansion coefficient,
It has good castability, a high melting point, and good compatibility with the porcelain.Furthermore, by combining this with additional elements in the above-mentioned combination ratio to form an alloy, the properties of the base alloy for the porcelain can be improved. It is possible to selectively encourage and energize the porcelain material, thereby achieving an excellent effect of fully satisfying the special conditions required for porcelain baking.

As a result, the denture technique is further improved technically, and there is an advantage that the dentures used can reduce the disadvantages as dentures.

Since the total amount used in the alloy of this invention is extremely small, it can be manufactured at low cost, and since the silver content is low, there is almost no discoloration reaction with porcelain. As an oral cavity filling material, it has excellent effects such as not deteriorating aesthetics.

Procedural amendment (voluntary) dated 1822, 1985 Haruki Shimada, Commissioner of the Japan Patent Office1, Indication of the case 1983 Patent Application No. 2034662, Title of the invention Low Karat Baking Alloy for Dental Use3, Person making the amendment Related Patent Applicant 4, Agent 105 Name Patent Attorney (7585) Yuki Tomi 1)
Spring 8. Contents of the amendment As shown in the attached sheet 1, the specification has been amended as follows:
Corrected.

(2) On page 6, line 15, ``E total rate'' was revised to ``total rate.'' iE.

(3) “1450℃” in the 6th line from the bottom of page 10 is r140
Corrected to 0°C.

(4) Delete "Wind dust: 1400℃" from the bottom three lines and "Time: 30 minutes" from the bottom two lines from the same page.

(5) Change [Tensile strength K9t/Tomo2] in the "Mechanical properties" column of Table 1 of No. 1400 to [Tensile strength 9f/R12J]
Corrected.

f6) Corrected “hatondo” to “completely” on page 16, lines 9 and 10 0

Claims (1)

[Scope of Claims] A dental low-karat baking alloy made by adding and blending other elements to a base alloy containing gold, wherein the base alloy is composed of palladium, gold, nickel, and platinum, each having a weight ratio of 60 to 70.
%, 5-301%, 5-30chi. 1 to 20 cm, and the additive metal is indium. Tin, iridium, ruthenium, silver, molybdenum. at least one of aluminum and germanium, and the weight ratio of each is 0.5 to 5%. 0.5~5%, 0.01~3%, 0.01~
3%, 0.1-5%, 0.1-5%, 0.1-1
%, 0.1 to 1%.