JP6288917B2 - Dental casting alloy and method for producing the same - Google Patents
Dental casting alloy and method for producing the same Download PDFInfo
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- 239000000956 alloy Substances 0.000 title claims description 50
- 238000005266 casting Methods 0.000 title claims description 31
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 238000009749 continuous casting Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 10
- 229910052725 zinc Inorganic materials 0.000 claims description 10
- 229910052738 indium Inorganic materials 0.000 claims description 8
- 229910052763 palladium Inorganic materials 0.000 claims description 8
- 238000005482 strain hardening Methods 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 238000011156 evaluation Methods 0.000 description 11
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 10
- 229910052709 silver Inorganic materials 0.000 description 7
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- 238000004140 cleaning Methods 0.000 description 6
- 229910052737 gold Inorganic materials 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 238000005495 investment casting Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 229910052741 iridium Inorganic materials 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052733 gallium Inorganic materials 0.000 description 2
- 239000010970 precious metal Substances 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 229910001252 Pd alloy Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000003483 aging Methods 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
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Description
本発明は、歯科治療に使用される鋳造用合金およびその製造方法に関するものである。 The present invention relates to a casting alloy used for dental treatment and a method for producing the same.
歯科治療において修復物作製に用いられる鋳造用合金は、精密鋳造によって所望の形状を与えることができ、適合性に優れる。また、熱処理によって機械的性質を適度に調整することが可能であるため、用途は、インレー、クラウン、ブリッジ、クラスプそしてデンチャーなど多岐にわたる。 A casting alloy used for restoration preparation in dental treatment can give a desired shape by precision casting and has excellent compatibility. In addition, since the mechanical properties can be appropriately adjusted by heat treatment, the applications are diverse such as inlays, crowns, bridges, clasps and dentures.
歯科治療に用いられる鋳造用合金は、Au、Ag、Pd及びCuのほか、種々の微量添加元素により構成されるが、歯科鋳造用合金は多様な元素が添加されるため、加工硬化が起こりやすく、機械加工が困難である。 Casting alloys used for dental treatment are composed of various trace additive elements in addition to Au, Ag, Pd and Cu, but dental casting alloys are subject to work hardening because various elements are added. Machining is difficult.
また、歯科鋳造用合金は、鋳造や熱処理によってCuや微量添加元素であるZn、In、Gaが酸化し、表面が黒色化する。鋳造や熱処理で生成する酸化膜は、技工工程において通常は酸又は専用のクリーナーなどの薬品によって洗浄・除去されるが、酸化膜と金属が強固に密着しているため、その除去は容易ではない。 Further, the alloy for dental casting is oxidized by Cu and heat treatments such as Cu and trace additive elements Zn, In, and Ga, and the surface becomes black. The oxide film produced by casting or heat treatment is usually washed and removed by chemicals such as acids or special cleaners in the engineering process, but it is not easy to remove because the oxide film and the metal are in close contact with each other. .
さらに、鋳造性を高めるために添加されるZn、In、Gaなどの元素は、合金の融点を下げるものの、それら元素が酸化しやすいため、薬品洗浄のしやすさと、鋳造性を両立させることは困難である。 In addition, elements such as Zn, In, and Ga that are added to improve castability lower the melting point of the alloy, but since these elements are easily oxidized, it is possible to achieve both ease of chemical cleaning and castability at the same time. Have difficulty.
特許文献1は、Au5〜15%、Pd20〜30%、Ag35〜69%、Cu5〜20%、Zn1〜3%、Ir50〜1000ppmの組成を有し、Irを含むことによって結晶粒を微細化することを特徴とする鋳造用合金である。当該発明の合金は、結晶粒の微細化により粘靱性が向上するものの、加工性の向上には十分とは言えず、加工中の割れ発生を抑えるために、加工率を低くして加工と熱処理を繰り返すため、加工工程が長くならざるを得ない。 Patent Document 1 has a composition of Au 5 to 15%, Pd 20 to 30%, Ag 35 to 69%, Cu 5 to 20%, Zn 1 to 3%, Ir 50 to 1000 ppm, and refines crystal grains by containing Ir This is an alloy for casting. Although the alloy of the present invention has improved toughness due to the refinement of crystal grains, it cannot be said that it is sufficient for improving workability, and in order to suppress cracking during processing, the processing rate is lowered and processing and heat treatment are performed. Since the process is repeated, the machining process must be lengthened.
特許文献2は、AuとAgを合計40mass％以上含有する歯科鋳造用合金であって、Znを含有せず、Gaを10mass％以下（0mass％以下を含まない）含有することを特徴とする歯科鋳造用合金である。当該発明の合金が必須元素として多量に含むGaは、低融点元素であるため合金の融点は低くなるが、薬品洗浄で酸化膜が除去しにくく、加工性についても悪化させる。 Patent Document 2 is a dental casting alloy containing a total of 40 mass% or more of Au and Ag, does not contain Zn, and contains 10 mass% or less (not including 0 mass% or less) of Ga. Alloy for casting. Ga contained in a large amount as an essential element in the alloy of the present invention is a low melting point element, so the melting point of the alloy is lowered, but the oxide film is difficult to remove by chemical cleaning, and the workability is also deteriorated.
本発明の目的は、従来の歯科鋳造用合金に見られた課題を解決し、加工性が良く、薬品洗浄による酸化膜の除去しやすさと、優れた鋳造性を兼ね備えた歯科鋳造用合金を提供することにある。 The object of the present invention is to provide a dental casting alloy that solves the problems found in conventional dental casting alloys, has good workability, and is easy to remove oxide film by chemical cleaning, and has excellent castability. There is to do.
本発明の第二の目的は、歯科鋳造用合金の加工時において割れ等発生させることなく、加工工程を短縮し、高い製品歩留を得るための製造方法を提供することにある。 The second object of the present invention is to provide a production method for shortening the machining process and obtaining a high product yield without causing cracks or the like during machining of the dental casting alloy.
本発明者らは、上記の目的を達成すべく鋭意検討した結果、鋳造用合金の組成とその製造方法を次のようにすることにより、発明を完成にするに至った。 As a result of intensive studies to achieve the above object, the present inventors have completed the invention by making the composition of the casting alloy and the production method thereof as follows.
本発明の合金は、Au：11〜15mass％、Pd：15mass％以上、Cu：14〜20mass％、Zn及びIn：3mass％以下、Ir：0.01〜0.5mass％、P：0.01〜1.0mass％、残部がAg：40mass％以上からなり、Au、Ag及びPdの貴金属含有量の合計が72mass％以上であることを特長とする。 The alloy of the present invention is Au: 11-15 mass% , Pd: 15 mass% or more, Cu: 14-20 mass%, Zn and In: 3 mass% or less, Ir: 0.01-0.5 mass%, P: 0.01-1.0 mass%, The balance is Ag : 40 mass% or more , and the total precious metal content of Au, Ag and Pd is 72 mass% or more.
また、本発明の合金は、Au：11〜15mass％、Pd：15〜25mass％、Cu：14〜20mass％、Zn及びIn：3mass％以下、Ir：0.01〜0.5mass％、P：0.01〜1.0mass％、残部がAg：40mass％以上からなる。 Further, the alloy of the present invention, Au: 11 ~15mass%, Pd : 15~25mass%, Cu: 14~20mass%, Zn and an In: 3 mass% or less, Ir: 0.01~0.5mass%, P: 0.01~1.0 Mass %, balance is Ag : 40mass% or more .
また、本発明の歯科鋳造用合金は、連続鋳造法により鋳造され、50％以上の加工率で加工することが可能である。 Further, the dental casting alloy of the present invention is cast by a continuous casting method and can be processed at a processing rate of 50% or more.
また、上記の合金の製造方法は、連続鋳造法により鋳造する工程と、鋳放しの状態で冷間加工を施す工程とを含むことを特長とする。 The alloy manufacturing method includes a step of casting by a continuous casting method and a step of cold working in an as-cast state.
本発明によれば、従来の鋳造用合金よりも加工性が良く、薬品洗浄による酸化膜の除去が容易であり、更に鋳造性に優れた歯科鋳造用合金を提供できる。 According to the present invention, it is possible to provide a dental casting alloy which has better processability than conventional casting alloys, can easily remove an oxide film by chemical cleaning, and has excellent castability.
また、本発明は大規模製造に有効であり、更に、本発明の合金とすることで、連続鋳造後に作製したスラブを焼鈍することなく圧延加工を行うことが可能であるため、製造工程の短縮を図ることが出来る。また、本発明の合金は加工性に優れるため、割れ等なく製品形状にすることができ、その結果、歩留を向上させることが出来る。 In addition, the present invention is effective for large-scale production, and further, by using the alloy of the present invention, it is possible to perform rolling without annealing a slab produced after continuous casting, thereby shortening the production process. Can be planned. Further, since the alloy of the present invention is excellent in workability, it can be formed into a product shape without cracks and the like, and as a result, the yield can be improved.
以下に、本発明における鋳造用合金の成分限定の理由と本合金の製造方法に関する各要件を具体的に説明する。 The reasons for limiting the components of the casting alloy in the present invention and the requirements relating to the method for producing the alloy will be specifically described below.
本発明の歯科鋳造用合金の第一の形態は、Au：9mass％以上、Pd：15mass％以上、Cu：14〜20mass％、Zn及びIn：3mass％以下、Ir：0.01〜0.5mass％、P：0.01〜1.0mass％、残部がAgからなり、Au、Ag及びPdの貴金属含有量の合計が72mass％以上であることを特長とする。 The first form of the dental casting alloy of the present invention is Au: 9 mass% or more, Pd: 15 mass% or more, Cu: 14 to 20 mass%, Zn and In: 3 mass% or less, Ir: 0.01 to 0.5 mass%, P : 0.01 to 1.0 mass%, the balance is made of Ag, and the total precious metal content of Au, Ag and Pd is 72 mass% or more.
Auの含有量は、9mass％以上であって、11〜15mass％であることが好ましく、12〜13mass％がより好ましい。 The Au content is 9 mass% or more, preferably 11 to 15 mass%, and more preferably 12 to 13 mass%.
Pdの含有量は、15mass%以上であって、18〜25mass％であることが好ましく、20〜23mass％がより好ましい。 The content of Pd is 15 mass% or more, preferably 18 to 25 mass%, and more preferably 20 to 23 mass%.
Agの含有量は、40mass％以上であることが好ましい。 The content of Ag is preferably 40 mass% or more.
Au、Pd、Agをこの様な範囲とするとともに、Au、Ag及びPdの貴金属含有量の合計を72％以上とすることで、耐食性に優れた安価な歯科鋳造用合金とすることができる。例えば、Auの含有量が12mass％以上、Pdの含有量が20mass％以上、Agの含有量が40mass％以上を満足するJIS T 6106の歯科鋳造用金銀パラジウム合金等にも適用できる。 By setting Au, Pd, and Ag in such a range, and making the total content of noble metals of Au, Ag, and Pd 72% or more, an inexpensive dental casting alloy having excellent corrosion resistance can be obtained. For example, the present invention can be applied to a gold-silver-palladium alloy for dental casting according to JIS T 6106 that satisfies a Au content of 12 mass% or more, a Pd content of 20 mass% or more, and an Ag content of 40 mass% or more.
Cuは、含有量を14〜20mass％とすることで、合金としたときの時効硬化能を発現させる。ただし、20mass%を超えて添加すると固相点が低下し、耐食性も悪化するため、15〜18mass％とすることがより好ましい。 Cu makes it age-hardening ability when it is set as an alloy by making content into 14-20 mass%. However, since addition of more than 20 mass% lowers the solid phase point and deteriorates the corrosion resistance, it is more preferably 15 to 18 mass%.
Zn及びInは、溶解・鋳造時の脱酸剤の効果と強度に効果がある。ZnとInの両方を添加する場合には、3mass%を超えて添加すると合金を脆化させるとともに、固相点低下が著しく、ろう付けを困難にすることから、その含有量を合計で3mass％以下とする。更に好ましくは、Zn及びInの合計量を0.4〜1.5mass％とすることで、酸化膜除去後の合金の色調を明るくすることが可能である。 Zn and In are effective in the effect and strength of the deoxidizer during melting and casting. When both Zn and In are added, adding more than 3 mass% causes the alloy to become brittle and the solidus point is markedly lowered, making brazing difficult. Therefore, the total content is 3 mass%. The following. More preferably, when the total amount of Zn and In is 0.4 to 1.5 mass%, the color tone of the alloy after the oxide film is removed can be brightened.
Irの添加は、合金の結晶粒を微細化できる。ただし、0.5mass%を超えて添加すると、合金中で偏析する恐れがあるため、好ましくは0.01〜0.2mass%とするのがよい。 The addition of Ir can refine the crystal grains of the alloy. However, if added over 0.5 mass%, segregation may occur in the alloy, so 0.01 to 0.2 mass% is preferable.
Pの添加は、Irの添加を上回る合金の結晶粒を微細化する効果があり、これによって加工性を向上させている。また、溶解・鋳造時において流動性を高め、鋳造性が向上し、更に薬品洗浄による酸化膜の除去しやすさに寄与する。その含有量は、0.01〜1.0mass％であることが好ましく、 0.01〜0.5mass％がより好ましい。 The addition of P has the effect of making the alloy crystal grains finer than the addition of Ir, thereby improving the workability. It also improves fluidity during melting and casting, improves castability, and contributes to easy removal of the oxide film by chemical cleaning. The content is preferably 0.01 to 1.0 mass%, more preferably 0.01 to 0.5 mass%.
また、本発明の歯科鋳造用合金は、実際の製造工程では、例えば連続鋳造法により鋳造されることを想定している。本発明の合金を用いた場合に本合金特有の超微細組織が得られるため、連続鋳造時の引出速度が向上する。 Further, it is assumed that the dental casting alloy of the present invention is cast by, for example, a continuous casting method in an actual manufacturing process. When the alloy of the present invention is used, an ultrafine structure peculiar to the present alloy is obtained, so that the drawing speed during continuous casting is improved.
このように連続鋳造法により鋳造された本発明の歯科鋳造用合金は、鋳放し状態で50％以上の加工率で冷間加工が可能という特徴を具備している。また、小規模での製造の場合は、型流しで単回で製造することもあるが、連続鋳造と同じように加工することが出来る。本発明の合金を連続鋳造後に焼鈍することも可能であり、その際には50％を上回る加工率の圧延加工も可能である。 Thus, the dental casting alloy of the present invention cast by the continuous casting method has a feature that it can be cold worked at a working rate of 50% or more in an as-cast state. In addition, in the case of small-scale production, although it may be produced by a single casting, it can be processed in the same manner as continuous casting. It is also possible to anneal the alloy of the present invention after continuous casting, in which case rolling with a processing rate exceeding 50% is possible.
冷間加工には、通常金属の塑性加工に用いる加工設備を組み合わせて使用することが可能である。 In cold working, it is possible to use a combination of processing equipment usually used for plastic working of metals.
（鋳造用合金の作製）
本発明の実施例、参考例及び比較例の組成を表1に示す。実施例、参考例及び比較例の評価結果を表2に示す。
(Manufacture of casting alloys)
Table 1 shows the compositions of Examples, Reference Examples and Comparative Examples of the present invention. Table 2 shows the evaluation results of Examples, Reference Examples and Comparative Examples.
合計50gとなるように各成分の原材料を秤量し、ガス溶解にて溶製した。このインゴットを、概ね60％の加工率で圧延し、700℃、30分で熱処理して焼鈍した。同様の圧延、焼鈍を繰返し、厚さ1mmの圧延板を作製した。 The raw materials of each component were weighed so that the total amount was 50 g, and melted by gas dissolution. The ingot was rolled at a processing rate of approximately 60% and annealed by heat treatment at 700 ° C. for 30 minutes. Similar rolling and annealing were repeated to produce a 1 mm thick rolled sheet.
各サンプルの溶融範囲（固相点-液相点）は、圧延版より試験片を切り出し、示差熱分析装置にて測定した。
硬さは、圧延板を歯科精密鋳造により厚さ1.2×幅15×長さ10mmに鋳造し、軟化熱処理及び硬化熱処理した。その後、樹脂に埋め込み、粗研磨、バフ研磨を経て鏡面研磨の試験片とし、マイクロビッカース硬さ試験機を用いて荷重200gf、10秒の条件で測定した。
引張強さ及び伸びは、前記と同様の鋳造方法で直径2×長さ50mmの丸棒を鋳造し、軟化熱処理及び硬化熱処理した。その後、引張試験機にて引張強さ及び伸びを測定した。
The melting range (solid phase point-liquid phase point) of each sample was measured with a differential thermal analyzer after cutting out a test piece from the rolled plate.
As for the hardness, a rolled plate was cast into a thickness of 1.2 × width of 15 × length of 10 mm by dental precision casting, followed by softening heat treatment and hardening heat treatment. Thereafter, it was embedded in a resin, subjected to rough polishing and buffing to obtain a mirror-polished test piece, and measured using a micro Vickers hardness tester under a load of 200 gf for 10 seconds.
For tensile strength and elongation, a round bar having a diameter of 2 × 50 mm in length was cast by the same casting method as described above, followed by softening heat treatment and hardening heat treatment. Thereafter, the tensile strength and elongation were measured with a tensile tester.
(加工性の評価)
加工性の評価では、上記圧延板を歯科精密鋳造にてφ6mmに鋳造し、溝圧延機にて加工率50％以上まで冷間加工した際の、割れの有無を評価した。加工率50％以上になっても割れが発生しなかったサンプルを〇とし、加工途中で割れが発生したサンプルを×とした。結果を表2に示す。
(Processability evaluation)
In the evaluation of workability, the presence or absence of cracks was evaluated when the rolled plate was cast to φ6 mm by dental precision casting and cold worked to a processing rate of 50% or more with a grooving mill. A sample in which cracking did not occur even when the processing rate reached 50% or more was marked with ◯, and a sample in which cracking occurred during processing was marked with ×. The results are shown in Table 2.
(洗浄性の評価)
洗浄性の評価では、薬品洗浄による酸化膜の除去しやすさを確認した。上記圧延板を歯科精密鋳造にて厚さ1.2×幅15×長さ15mmに鋳造し、表面を研磨して800番の耐水研磨紙で仕上げた。次に、軟化処理として750℃、10分間熱処理して表面を酸化させた後、洗浄剤（石福金属興業、キンパラクリーナー）中で超音波洗浄した後に取出し、酸化膜の落ち具合を目視により評価した。5分間の洗浄の後に酸化膜がほぼ完全に除去されているものを○、酸化膜がまだら状に残っているものを×とした。結果を表2に示す。
(Evaluation of cleanability)
In the evaluation of cleanability, the ease of removal of the oxide film by chemical cleaning was confirmed. The rolled plate was cast into a thickness of 1.2 x width 15 x length 15 mm by dental precision casting, and the surface was polished and finished with No. 800 water-resistant abrasive paper. Next, after softening treatment, heat treatment was performed at 750 ° C for 10 minutes to oxidize the surface, and after ultrasonic cleaning in a cleaning agent (Ishifuku Metal Industry Co., Ltd., Kinpara Cleaner), it was taken out and visually evaluated for the degree of oxide film dropping. did. A sample in which the oxide film was almost completely removed after washing for 5 minutes was marked with ◯, and a sample in which the oxide film remained mottled was marked with x. The results are shown in Table 2.
(鋳造性の評価)
鋳造性の評価では、上記圧延板を歯科精密鋳造にて2.5mm四方の格子状のワックスパターンを用いて鋳造し、鋳造体の鋳込み面積を画像解析ソフトで算出して評価した。ワックスパターンの面積に対し鋳造体の面積が90％以上だったものを○、90％に満たなかったものを×とした。結果を表2に示す。また、実施例3の鋳造体外観（評価〇）を図1に示し、比較例3の鋳造体外観（評価×）を図2に示す。
(Castability evaluation)
In the evaluation of castability, the rolled plate was cast using a precision 2.5 mm square wax pattern by dental precision casting, and the cast area of the cast body was calculated and evaluated with image analysis software. The case where the area of the cast body was 90% or more with respect to the area of the wax pattern was rated as ○, and the case where it was less than 90% was rated as x. The results are shown in Table 2. Further, the appearance of the cast body of Example 3 (evaluation O) is shown in FIG. 1, and the appearance of the cast body of Comparative Example 3 (evaluation ×) is shown in FIG.
(連続鋳造後の限界加工率の評価)
実施例3と比較例3の組成の合金について、合計80kgとなるように各成分を秤量し、連続鋳造機による鋳造、冷間圧延加工を行い製造工程における評価を行った。連続鋳造後、鋳放し状態における製品サンプルの限界加工率を確認したところ、比較例3のサンプルでは限界加工率10％程度だったのに対し、実施例3のサンプルでは加工率が50％を超えても割れが発生しなかった。
(Evaluation of critical processing rate after continuous casting)
With respect to the alloys having the compositions of Example 3 and Comparative Example 3, each component was weighed so that the total amount would be 80 kg, and cast in a continuous casting machine and cold rolling were performed for evaluation in the manufacturing process. After continuous casting, the critical processing rate of the product sample in the as-cast state was confirmed. The sample of Comparative Example 3 had a critical processing rate of about 10%, whereas the sample of Example 3 had a processing rate of over 50%. However, no cracks occurred.
（実験結果まとめ）
実施例及び参考例の合金は、表2に示す特性データの結果からも分かるように、硬さ、0.2％耐力及び伸びについて比較例に示す従来の合金と劣らず、十分な特性を備えていた。また、比較例の合金に比べて、加工性、洗浄性及び鋳造性に優れていた。
実施例3と比較例3の組成の合金を実施予定の方法（連続鋳造法）で製造したところ、連続鋳造後の鋳放し状態における材料の限界加工率は、比較例の合金では50％未満に対し、実施例及び参考例の合金では50％以上に増加しており、連続鋳造後にそのまま冷間加工する製造方法に適することが明らかとなった。
(Summary of experimental results)
As can be seen from the results of the characteristic data shown in Table 2, the alloys of the examples and the reference examples had sufficient characteristics as compared with the conventional alloys shown in the comparative examples in terms of hardness, 0.2% proof stress and elongation. . Moreover, it was excellent in workability, washability, and castability compared with the alloy of the comparative example.
When the alloys having the compositions of Example 3 and Comparative Example 3 were produced by the planned method (continuous casting method), the critical processing rate of the material in the as-cast state after continuous casting was less than 50% in the comparative alloy. On the other hand, in the alloys of Examples and Reference Examples, it increased to 50% or more, and it became clear that it was suitable for a manufacturing method in which cold working was performed after continuous casting.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4389370A (en) * | 1981-05-06 | 1983-06-21 | Skalabrin Nicholas J | Low gold content dental alloy |
| JP2641536B2 (en) * | 1988-11-25 | 1997-08-13 | 株式会社徳力本店 | Dental composite metal material |
| JP2641538B2 (en) * | 1988-11-25 | 1997-08-13 | 株式会社徳力本店 | Dental composite metal material |
| JP2751102B2 (en) * | 1988-11-25 | 1998-05-18 | 株式会社徳力本店 | Dental metal material |
| JP2788280B2 (en) * | 1989-04-07 | 1998-08-20 | シチズン時計株式会社 | Shape memory gold alloy |
| JP2691085B2 (en) * | 1991-05-11 | 1997-12-17 | 株式会社アイズ・インターナショナル | Dental casting material |
| EP0729740B1 (en) * | 1995-02-25 | 2004-03-24 | DeguDent GmbH | Use of gold alloys for making construction elements in dentistry |
| JP2008214748A (en) * | 2007-02-08 | 2008-09-18 | Asahi Pretec Corp | Dental casting alloy |
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