JPS6131174B2 - - Google Patents

Description

[Detailed description of the invention]

<Industrial Application Field> The disclosed technology belongs to the technical field of improving the bond between porcelain baking alloys used in dentistry and porcelain materials. <Summary of the gist> The invention of this application is a dental porcelain porcelain porcelain ware that has a base alloy containing multiple metals including gold and has a predetermined blending ratio, and further contains additional elements in a predetermined blending ratio. This invention relates to low carat baking alloys,
In particular, the base alloys are palladium, gold, nickel, and platinum, and the weight ratios are 30 to 70% and 5 to 30%, respectively.
%, 5 to 30%, and 1 to 20% to have the basic characteristics of a porcelain baking alloy, and furthermore, the weight ratio of the additive element to this base alloy is set to 0.5 to 5%.
%, tin 0.5-5%, iridium 0.01-3%, ruthenium 0.01-3%, silver 0.1-5%, molybdenum
0.1 to 5% of aluminum, 0.1 to 1% of germanium, and 0.1 to 1% of germanium are selectively added to the base alloy, or all of them are added to the above base alloy to selectively promote the above characteristics. This is such an invention. <Prior art> As is well known, various technical methods are used in dental treatment, among which is a technique in which an artificial denture is attached to replace the defective part created by removing the necessary amount of the affected part of the tooth to be treated. The technology is widely used. In this case, the general form of the denture that is worn is what is called a porcelain-baked alloy, which is made by baking porcelain on a metal surface and integrating it. Therefore, in order to fully perform the function of dentures by bonding and integrating different types of porcelain to metal, it is important to consider how to compensate for the inherent hardness and brittleness of porcelain as a porcelain baking alloy. It is necessary to satisfy two conditions: one condition and the other condition of how to maintain the bond between the porcelain and the metal. As a porcelain baking alloy 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 guaranteed by matching the coefficient of thermal expansion of the alloy as much as possible, and in order to stabilize the alloy, it is necessary to assume that the melting point of the alloy is higher than the firing temperature of the porcelain. . <Problems to be solved by the invention> Conventionally, porcelain baking alloys that satisfy these complex conditions and assumptions include those based on noble metals as the main components, and non-noble metals based on nickel, chromium, and cobalt. However, there were problems that did not meet actual needs. In other words, while the former precious metal type has many advantages such as easy casting operation, excellent compatibility with the other material, and high seizure strength, it also has the disadvantage that its functional strength is not necessarily sufficient, resulting in high cost. In addition, there was the disadvantage that it was difficult to secure materials because the market price was unstable. In addition, the latter type of non-precious metals is inexpensive and can reduce costs, and has excellent mechanical properties and corrosion resistance, but on the other hand, it has a high melting point and is easily oxidized at high temperatures, and furthermore, it is difficult to determine the timing of casting. There are some disadvantages, such as large coagulation shrinkage. Due to these circumstances, in reality, there was a problem in that almost perfect technical techniques for porcelain baking alloys could not be carried out except in systematized large-scale laboratories. The purpose of the invention of this application is to solve the problems of porcelain baked alloys based on the above-mentioned prior art. The purpose of this invention is to provide an excellent dental low-karat baking alloy that can benefit the field of use of porcelain baking alloys that occupies the dental treatment industry by skillfully polymerizing the porcelain baking alloys' excellent physical properties. . <Means/effects for solving the problems> In accordance with the above-mentioned purpose, the structure of the invention of this application, which is summarized in the above-mentioned claims, uses palladium, gold, nickel, and platinum in order to solve the above-mentioned problems. The weight ratio of the set blending ratio is 30 to 70% and 5 to 30, respectively.
%, 5 to 30%, and 1 to 20%, making it a low-cost base alloy with excellent high-temperature properties, modulus of elasticity, thermal expansion, castability, melting point, and compatibility with porcelain. 0.5 to 5% and 0.5% respectively of indium, tin, iridium, ruthenium, silver, molybdenum, aluminum, and germanium.
~5%, 0.01~3%, 0.01~3%, 0.1~5%,
It is added as a compound metal in the range of 0.1 to 5%, 0.1 to 1%, and 0.1 to 1%.
In the second term, at least one of indium and tin is added, in the second term, in addition to indium and tin, iridium is added, and in the third term, indium, tin, iridium, ruthenium, silver, molybdenum, aluminum, and germanium are added. By doing so, technical means have been taken to selectively promote the above characteristics. In the invention of this application, the reasons for limiting the base alloy, additive elements, and their blending ratios are as follows. First, regarding the base alloy, palladium is a metal that has corrosion resistance so that it will not melt and discolor under the conditions in which it is installed in the oral cavity as a denture. Essentially effective in maintaining temperatures above
In order to satisfy these functions, it has been experimentally found that less than 30% does not work effectively, and more than 70% increases the melting point and deteriorates castability.
The optimum weight ratio is 30 to 70%. Next, regarding gold, it is a necessary metal to strengthen the bonding force with porcelain, and it is also known that it is useful for improving mechanical strength, so if the mixing ratio is less than 5%, no effect can be expected. On the other hand, if it exceeds 30%, the seizure strength will become unstable and the cost will increase, so
%. Nickel is completely dissolved in solid solution with the palladium mentioned above, and its melting point is 40%wt nickel-palladium alloy at 1240℃, and its thermal expansion is similar to that of porcelain, so it is necessary to maintain a strong bond with porcelain. It is a metal necessary to meet the characteristics, and if it is less than 5%, the effect will be weak, and if it exceeds 30%, the scorching property between the porcelain and the alloy will be weakened, so the optimal range is 5 to 30%. It is. Finally, platinum is an effective metal in reducing the thermal expansion of alloys and making them stronger.
Experiments have shown that a range of 1 to 20% is most effective. Regarding the additive elements to the above-mentioned base alloy, both indium and tin can form an oxide film on the alloy surface to improve the physicochemical bond with the porcelain material, and also have the effect of deoxidizing the material. It has been experimentally confirmed that the polymerization blending ratio at which the optimum effects are achieved is in the range of 0.5 to 5%. Next, regarding iridium, it is a metal that helps significantly promote the refinement of alloy crystals by adding it, but if the amount added is less than 0.01%, the effect is extremely weak, while if it exceeds 3%, it will become brittle. Therefore, a range of 0.01 to 3% is set as the most preferable range. Furthermore, it has been found that the addition of ruthenium is not only extremely effective in refining crystals like iridium, but also very effective in improving mechanical strength, and the amount of ruthenium added is 0.01%.
If it is less than 3%, the effect is weak, and if it exceeds 3%, it becomes brittle, so based on experimental data, the optimum addition amount is set at 0.01 to 3%. Next, regarding the addition of silver, it has the excellent function of improving castability and controlling thermal expansion even if the amount added is less than 0.1%. has no effect,
On the other hand, if it exceeds 5%, a reaction with the porcelain will occur when silver is oxidized, so the optimal effective range is 0.1 to 5%.
This is what was said. The addition of molybdenum not only improves mechanical properties, but also has the advantage of forming a moderately hardened film on the metal surface and deoxidizing the material.Moreover, its oxide is white and It has the effect of suppressing the formation of nickel black oxide that occurs during the baking process, making it preferable for dentures to be placed in the oral cavity, and the most effective addition weight ratio is The range is 0.1
It has been experimentally determined that it is ~5%, and 0.1%
If it is less than 5%, the effect will be weak, and if it exceeds 5%, the melting point will rise, the castability will deteriorate, and embrittlement will progress, which is not preferable. The addition of aluminum is extremely effective because it increases the baking bond strength with the porcelain and also promotes the deoxidizing effect of the material.If the amount added is less than 0.1%, the effect will be weakened, and if it exceeds 1%, the effect will be weakened. Since it was found that this would cause embrittlement, the optimum range was set at 0.1% to 1%. Finally, with regard to germanium, the addition of germanium significantly improves castability, and the addition of a small amount of germanium can arbitrarily change the thermal expansion. The optimum range is % to 1%. Next, examples of the invention of this application are shown in Table 1 below along with known examples in terms of chemical component blending ratio (wt%). In addition, Example numbers 1 to 5 in the table are sample numbers of Examples.

[Table] For each sample No. 1 to No. 5 of the above examples and known samples, each material was melted for 30 minutes at a melting temperature of 1400°C in a well-known high frequency heating melting furnace, and t10× After casting into a shape of w50 x 100 mm, it was possible to press it into a predetermined shape using a cold pressing roll. Size: Length 100 mm, Width 50 mm, Thickness 10 mm Next, the processed materials of each example sample obtained as described above and the known sample were cast to t1.0× by centrifugal casting.
The required number of plate-shaped test pieces measuring 10 mm (w) x 15 mm (l) were prepared, and the following hardness tests, color tone observations, and discoloration tests were conducted. In addition, rod-shaped test pieces of φ2.0 x l50 mm were made using the same centrifugal casting method, and were subjected to tensile tests, elongation measurement tests,
A thermal expansion coefficient measurement test was conducted. Contents of each test (1) Hardness test Using a Micro Bitkers hardness tester, a load of 200
g, and the load time was 30 seconds. (2) Structure observation test The test 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 tone at the final stage was
Using the standard color chart specified by JIS・Z・8721, JIS・
Observe the surface color tone using the surface color comparison method specified in Z.8723. (4) Discoloration state observation test After thoroughly polishing the test piece with No. 400 test paper specified by JIS R 6253, one type of test piece has a 37±
The test specimens of other types were fully immersed and partially immersed in a mixed solution of 0.1% sodium sulfide and 1% lactic acid at 37±2°C for 3 days in a 0.1% sodium sulfide solution at 2°C. Observe the state of discoloration (5) Tensile strength test A tensile test piece (gauge length 20 mm) was measured using a Tensilon tensile tester at a tensile speed of 10 mm/min. (6) Elongation measurement test Same as above (7) Coefficient of thermal expansion test Using a compressive load method thermomechanical analyzer, a load of 5 g,
Measurement was performed at a heating rate of 10°C/min. The results of each of the above tests are shown in the table below. In addition, the ○ mark in the above discoloration test indicates that there was no change at all, and for test materials A, D, and G in the table, A: Cast material (as cast) D : Day gearing treated material (softened and degassed...1050℃×10min) G: Glaze treated material (passed the final process of porcelain baking) And regarding the results of the discoloration test, A: 0.1% sodium sulfide solution B: 0.1 % sodium sulfide solution and 1% lactic acid in equal amounts.

[Table] As shown in the test data in the table above, the baked alloy of the invention of this application is not only far superior in mechanical properties such as hardness and tensile strength, but also far superior in elongation compared to known samples. It has been found to have excellent properties and cushioning properties, and it has also been demonstrated that it has a higher melting point than conventional alloys at the firing temperature of porcelain. In addition, the coefficient of thermal expansion is not much different from that of conventional alloys,
It can be seen that the bonding state with the porcelain material can be maintained well. It goes without saying that the invention of this application may be implemented in various combinations other than those shown in the above table. <Effects of the Invention> As described above, according to the invention of this application, in a dental low-carat baking alloy, the base alloy that becomes the denture metal has the composition and blending ratio within the scope of the claims, thereby achieving low cost and , excellent mechanical properties and high temperature properties, good modulus of elasticity, good coefficient of thermal expansion, good castability, high melting point, and good compatibility with porcelain. By forming an alloy with the additive elements, it is possible to selectively promote and enhance the properties of the above-mentioned base alloy for porcelain, thereby fully satisfying the special conditions required for porcelain baking. The excellent effect of being able to do this is achieved. In particular, in the first invention, the porcelain baking properties are improved, in the second invention, crystal refinement is promoted, and in the third invention, castability is improved, and the surface An excellent effect is achieved in that black oxides are suppressed. This has the advantage that the denture technique is further improved technically and the disadvantages of the dentures used can be reduced. Since the alloy of the invention of this application uses significantly less gold, it can be manufactured at low cost.Also, because the silver content is small, there is no discoloration reaction with porcelain, and it is easy to use. As a vaginal filler, it has excellent effects such as not deteriorating aesthetics.

Claims (1)

[Scope of Claims] 1. A dental low-karat baking alloy made by adding and blending other elements to a base alloy containing gold, in which the base alloy consists of palladium, gold, nickel, and platinum, each in a weight ratio of 30 to 70. %, 5-30%, 5-30%, 1
~20% and ~0.5 indium relative to the base alloy
5%, tin with a weight ratio of 0.5 to 5% at least 1
A dental low carat sintering alloy characterized by the addition of seeds. 2. In a dental low-karat baking alloy made by adding and blending other elements to a base alloy containing gold, the base alloy consists of palladium, gold, nickel, and platinum, and the weight ratio is 30 to 70% and 5 to 30%, respectively. , 5-30%, 1
~20% and 0.5 indium to base alloy
~5%, tin 0.5-5%, and iridium 0.01
A dental low carat baking alloy characterized by adding ~3%. 3. In a dental low-karat baking alloy made by adding and blending other elements to a base alloy containing gold, the base alloy consists of palladium, gold, nickel, and platinum, and the weight ratio is 30 to 70% and 5 to 30%, respectively. , 5-30%, 1
~20% and ~0.5 indium relative to the base alloy
5%, tin 0.5-5%, iridium 0.01-3%,
A dental low-karat baking alloy, characterized in that it contains 0.01-3% ruthenium, 0.1-5% silver, 0.1-5% molybdenum, 0.1-1% aluminum, and 0.1-1% germanium.