JP2002336276A - Dental casting implant material - Google Patents
Dental casting implant materialInfo
- Publication number
- JP2002336276A JP2002336276A JP2001150923A JP2001150923A JP2002336276A JP 2002336276 A JP2002336276 A JP 2002336276A JP 2001150923 A JP2001150923 A JP 2001150923A JP 2001150923 A JP2001150923 A JP 2001150923A JP 2002336276 A JP2002336276 A JP 2002336276A
- Authority
- JP
- Japan
- Prior art keywords
- casting
- dental
- dental casting
- investment material
- investment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、歯科鋳造用貴金属
合金の鋳造物に用いられる埋没材に関する。より詳しく
は、歯科鋳造用貴金属合金を鋳造する際に用いた場合、
鋳造物表面の酸化黒変が大幅に低減される埋没材に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an investment material used for casting a noble metal alloy for dental casting. More specifically, when used when casting precious metal alloys for dental casting,
The present invention relates to an investment material in which oxidation blackening on the surface of a casting is significantly reduced.
【０００２】[0002]
【従来の技術】従来の歯科鋳造用貴金属合金、即ち、鋳
造用金合金あるいは鋳造用金・銀・パラジウム合金など
は、合金の硬度を改善し且つ熱処理効果を発現させるた
めに、銅が含有されている。これらの合金を従来の鋳造
用埋没材を用いて鋳造すると、含有される銅が酸化され
ることによって鋳造物の表面が黒色の酸化膜で覆われ
る。そのため、鋳造物の黒色酸化膜を硫酸、塩酸あるい
は他の処理剤により取り除いて、合金本来の色調、光沢
を発現させ、さらに研磨等を行うのが一般的に行われて
いる。2. Description of the Related Art A conventional noble metal alloy for dental casting, that is, a gold alloy for casting or a gold / silver / palladium alloy for casting contains copper in order to improve the hardness of the alloy and to exert a heat treatment effect. ing. When these alloys are cast using a conventional investment material for casting, the copper contained therein is oxidized and the surface of the casting is covered with a black oxide film. For this reason, it is common practice to remove the black oxide film of the casting with sulfuric acid, hydrochloric acid or another treating agent to express the original color tone and luster of the alloy, and further perform polishing and the like.
【０００３】しかし、黒色酸化膜を取り除くのに余分な
手間を必要とするのみならず、処理の際に酸類の蒸気に
よって歯科技工室あるいは診療室内の器物が腐食したり
汚損するなどの諸問題がある。[0003] However, not only is extra work required to remove the black oxide film, but also there are problems such as corrosive and fouling of the equipment in the dental lab or the clinic due to the vapor of acids during the treatment. is there.
【０００４】従って、このような黒色酸化膜の発生を防
止するために、歯科鋳造用埋没材に黒鉛粉末、金属銅
粉、ホウ酸、酸化アルミニウムあるいは酸化マグネシウ
ムなどを単独に加える試みがなされているが、何れも黒
色酸化膜の発生を防止するにはあまり効果がないので、
依然として鋳造物を酸処理しているのが実状である。[0004] Therefore, in order to prevent the formation of such a black oxide film, attempts have been made to add graphite powder, metallic copper powder, boric acid, aluminum oxide, magnesium oxide or the like alone to the investment material for dental casting. However, neither of them is very effective in preventing the formation of a black oxide film.
The fact is that the castings are still acid-treated.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、上記問題点
を解決するためになされたものであり、歯科鋳造用貴金
属合金を鋳造するために用いた場合、鋳造物表面の黒色
酸化膜の発生が防止される歯科鋳造用埋没材を提供する
ことを課題とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and when used for casting a noble metal alloy for dental casting, the formation of a black oxide film on the surface of the cast product. An object of the present invention is to provide an investment material for dental casting in which the investment is prevented.
【０００６】[0006]
【課題を解決するための手段】本発明者等は、歯科鋳造
用貴金属合金の鋳造に用いられ、耐火材と結合材とを少
なくとも含み、さらに酸化防止元素を加えることにより
得られる歯科鋳造用埋没材は、歯科鋳造用貴金属合金を
鋳造するために用いた場合、鋳造物表面の黒色酸化膜の
発生が抑制されることを見出し、本発明を完成するに至
った。Means for Solving the Problems The present inventors have found that a dental casting implant for use in the casting of a noble metal alloy for dental casting which contains at least a refractory material and a binder and is obtained by adding an antioxidant element. When the material was used to cast a noble metal alloy for dental casting, it was found that the formation of a black oxide film on the surface of the casting was suppressed, and the present invention was completed.
【０００７】即ち、本発明は以下の通りである。 （１）歯科鋳造用貴金属合金の鋳造に用いられ、耐火材
と結合材とを少なくとも含む歯科鋳造用埋没材におい
て、酸化防止元素を含むことを特徴とする歯科鋳造用埋
没材。 （２）前記耐火材がクリストバライトであり、前記結合
材が石膏である（１）の歯科鋳造用埋没材。 （３）前記酸化防止元素は、ホウ素、シリコン、アルミ
ニウム、クロム、スズ、ジルコニウム、バナジウム、セ
リウム及び亜鉛からなる群から選ばれる１つまたはそれ
以上の組み合わせである（１）又は（２）の歯科鋳造用
埋没材。 （４）歯科鋳造用埋没材全量に対する酸化防止元素の含
有量は、０．００１〜１５質量％である（１）〜（３）
のいずれかの歯科鋳造用埋没材。 （５）前記歯科鋳造用埋没材は、８００℃以上１２００
℃以下で鋳造に供されるためのものである（１）〜
（４）のいずれかの歯科鋳造用埋没材。That is, the present invention is as follows. (1) An investment material for dental casting, which is used for casting a precious metal alloy for dental casting and contains at least a refractory material and a binder, wherein the investment material contains an antioxidant element. (2) The investment material for dental casting according to (1), wherein the refractory material is cristobalite and the binder is gypsum. (3) The dental according to (1) or (2), wherein the antioxidant element is one or more combinations selected from the group consisting of boron, silicon, aluminum, chromium, tin, zirconium, vanadium, cerium, and zinc. Investment for casting. (4) The content of the antioxidant element with respect to the total amount of the investment material for dental casting is 0.001 to 15% by mass (1) to (3).
Any of the investment materials for dental casting. (5) The investment material for dental casting is 800 ° C. or more and 1200 ° C.
(1)-
The investment material for dental casting according to any of (4).
【０００８】[0008]
【発明の実施の形態】以下に本発明を詳細に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
【０００９】本発明の歯科鋳造用埋没材は、歯科鋳造用
貴金属合金の鋳造に用いられ、少なくとも耐火材、結合
材、酸化防止元素とを含む。[0009] The investment material for dental casting of the present invention is used for casting a noble metal alloy for dental casting, and contains at least a refractory material, a binder, and an antioxidant element.
【００１０】本発明において用いられる耐火材として
は、歯科鋳造用埋没材に通常用いられる耐火材でよく、
クリストバライト、石英、珪石等が挙げられ、好ましく
はクリストバライトが用いられる。The refractory material used in the present invention may be a refractory material usually used for an investment material for dental casting.
Cristobalite, quartz, quartzite, etc. are mentioned, and preferably, cristobalite is used.
【００１１】結合材としては、石膏が挙げられ、好まし
くはα型半水石膏が用いられる。[0011] Examples of the binder include gypsum, preferably α-type hemihydrate gypsum.
【００１２】本発明における酸化防止元素として、ホウ
素、シリコン、アルミニウム、クロム、スズ、ジルコニ
ウム、バナジウム、セリウム及び亜鉛等からなる群から
選ばれる１つまたはそれ以上の組み合わせを用いること
が出来る。この中でも特にホウ素が好ましい。[0012] As the antioxidant element in the present invention, one or more combinations selected from the group consisting of boron, silicon, aluminum, chromium, tin, zirconium, vanadium, cerium, zinc and the like can be used. Of these, boron is particularly preferred.
【００１３】用いられる形状としては、特に制限はない
が、粉末状で用いることが、製造上、操作上の点から好
ましい。The shape used is not particularly limited, but is preferably used in powder form from the viewpoint of production and operation.
【００１４】粉末の大きさとしては、特に制限はない
が、平均粒径５μｍ以下のものが好ましく用いられる。
平均粒径が５μｍを超えた酸化防止元素が添加された歯
科鋳造用埋没材を、歯科鋳造用貴金属合金の鋳造に用い
た場合、得られる鋳造物の表面平滑性が悪くなる傾向が
ある。The size of the powder is not particularly limited, but those having an average particle size of 5 μm or less are preferably used.
When an investment material for dental casting to which an antioxidant element having an average particle size of more than 5 μm is added is used for casting a precious metal alloy for dental casting, the surface smoothness of the obtained casting tends to deteriorate.
【００１５】歯科鋳造用埋没材全量に対する耐火材の含
有量としては３０〜９０質量％が好ましく、結合材の含
有量としては１０〜５０質量％が好ましい。The content of the refractory is preferably 30 to 90% by mass, and the content of the binder is preferably 10 to 50% by mass based on the total amount of the investment material for dental casting.
【００１６】また、歯科鋳造用埋没材全量に対する酸化
防止元素の含有量としては、０．００１〜１５質量％が
好ましく、さらには０．０５〜５質量％がより好まし
い。上記範囲で含有させることにより、本発明の歯科鋳
造用埋没材を鋳造物とした際に黒色酸化膜の発生を効果
的に防止することができる。含有量が０．００１質量％
未満では、黒色酸化膜の発生を防止できないことがあ
り、１５質量％を超えた場合、増加に伴った効果が得ら
れないだけでなく、埋没材の性質を劣化させることがあ
る。Further, the content of the antioxidant element relative to the total amount of the investment material for dental casting is preferably 0.001 to 15% by mass, and more preferably 0.05 to 5% by mass. By containing in the above range, it is possible to effectively prevent the formation of a black oxide film when the investment material for dental casting of the present invention is used as a casting. 0.001% by mass
If it is less than 15%, it may not be possible to prevent the generation of a black oxide film.
【００１７】本発明の歯科鋳造用埋没材は、前記耐火
材、結合材、酸化防止元素以外に、必要により、凝固調
整剤等を含有していてもよい。これらの含有量は、歯科
鋳造用埋没材全量に対して、０．１〜１質量％が好まし
い。The investment material for dental casting of the present invention may contain, if necessary, a coagulation regulator and the like in addition to the refractory material, the binder, and the antioxidant element. These contents are preferably 0.1 to 1% by mass based on the total amount of the investment material for dental casting.
【００１８】本発明の歯科鋳造用埋没材は、例えば、以
下のようにして製造する。The investment material for dental casting of the present invention is produced, for example, as follows.
【００１９】上記原料を、ボールミル等の混合機に加
え、十分混合して、細粉状とする。これをメッシュ篩等
で篩別して、歯科鋳造用埋没材を得る。この様にして得
られる本発明の歯科鋳造用埋没材の粒径は、特に制限は
ない。The above-mentioned raw materials are added to a mixer such as a ball mill and sufficiently mixed to form a fine powder. This is sieved with a mesh sieve or the like to obtain an investment material for dental casting. The particle size of the investment material for dental casting of the present invention thus obtained is not particularly limited.
【００２０】本発明の歯科鋳造用埋没材を用いて歯科用
金属修復物（歯科鋳造用貴金属合金の鋳造物）を作成す
る方法について以下説明するが、本発明はこれに限定さ
れない。A method for producing a dental metal restoration (a casting of a noble metal alloy for dental casting) using the investment material for dental casting of the present invention will be described below, but the present invention is not limited to this.
【００２１】歯科鋳造用貴金属合金としては、金、銀及
びパラジウムから選ばれる一つまたはそれ以上を主成分
として含み、硬度、熱処理効果を発現させるために銅が
含有された合金のことである。The noble metal alloy for dental casting is an alloy containing one or more selected from gold, silver and palladium as a main component, and containing copper for exhibiting hardness and a heat treatment effect.
【００２２】歯科用金属修復物を作成する方法として
は、一般的に用いられるロストワックス法が挙げられ
る。以下、具体例を示す。As a method for preparing a dental metal restoration, there is a commonly used lost wax method. Hereinafter, specific examples will be described.
【００２３】まず、本発明の歯科鋳造用埋没材１００質
量部に対して、３０〜４０質量部の水等を添加し練和さ
せる。予め修復物の形態をワックス材料で形成してお
き、それに溶融金属注入口を設けるためにスプルー線な
どを付し、練和した前記埋没材に埋没する。硬化した埋
没材を電気炉に入れワックス材料を焼却除去する。こう
して得られた鋳型に前記溶融金属注入口から溶融貴金属
合金を注入し、鋳造する。このとき、貴金属合金の溶融
温度は８００℃以上１２００℃以下の温度である。First, 30 to 40 parts by mass of water or the like is added to 100 parts by mass of the investment material for dental casting of the present invention, and the mixture is kneaded. The restoration is formed in advance in the form of a wax material, and a sprue wire or the like is attached thereto to provide a molten metal injection port, and the restoration is buried in the kneaded investment material. The cured investment material is placed in an electric furnace to burn off the wax material. A molten noble metal alloy is injected from the molten metal injection port into the thus obtained mold and cast. At this time, the melting temperature of the noble metal alloy is a temperature of 800 ° C. or more and 1200 ° C. or less.
【００２４】本発明の歯科鋳造用埋没材を用いて、歯科
鋳造用貴金属合金を鋳造することにより、黒色酸化膜が
生成されない歯科用鋳造物を得ることができる。By casting a noble metal alloy for dental casting using the investment material for dental casting of the present invention, a dental casting in which a black oxide film is not formed can be obtained.
【００２５】本発明の歯科鋳造用埋没材を用いて、上記
のようにして得られた鋳造物を図１と図２に示す。な
お、比較として従来の歯科鋳造用埋没材（酸化防止元素
が含有されていない埋没材）を用いて得られた鋳造物も
示す。FIGS. 1 and 2 show casts obtained as described above using the investment material for dental casting of the present invention. As a comparison, a casting obtained using a conventional investment material for dental casting (an investment material containing no antioxidant element) is also shown.
【００２６】図１は、鋳造用貴金属合金にＪＩＳで規定
されているタイプIV金合金を用いて鋳造物を作成した場
合であり、図２は鋳造用貴金属合金にＪＩＳで規定され
た金・銀・パラジウム合金を用いて鋳造物を作成した場
合の写真を示す。FIG. 1 shows a case where a casting is prepared by using a type IV gold alloy specified by JIS as a noble metal alloy for casting, and FIG. 2 shows gold / silver specified by JIS as a noble metal alloy for casting. -The photograph when a casting is created using a palladium alloy is shown.
【００２７】図１中（ａ）は本発明の歯科鋳造用埋没材
を用いて得られた鋳造物であり、（ｂ）は本発明の特徴
である酸化防止元素が添加されない歯科鋳造用埋没材を
用いて得られた鋳造物を示す。FIG. 1 (a) shows a casting obtained using the investment material for dental casting of the present invention, and FIG. 1 (b) shows an investment material for dental casting to which an antioxidant element which is a feature of the present invention is not added. 2 shows a casting obtained using
【００２８】同様に、図２中（ｃ）は本発明の歯科鋳造
用埋没材を用いて得られた鋳造物であり、（ｄ）は本発
明の特徴である酸化防止元素が添加されない歯科鋳造用
埋没材を用いて得られた鋳造物を示す。Similarly, FIG. 2 (c) shows a casting obtained using the investment material for dental casting of the present invention, and FIG. 2 (d) shows a dental casting which does not contain an antioxidant element which is a feature of the present invention. 1 shows a casting obtained using the investment investment material.
【００２９】本発明の歯科鋳造用埋没材は、歯科鋳造用
貴金属合金の鋳造に供したときに、得られた貴金属合金
鋳造物の黒色酸化膜の発生を防止するだけでなく、埋没
材の硬化時間、硬化膨張、熱膨張、圧縮強さに関しても
好ましい物性を有する。The investment material for dental casting of the present invention not only prevents the formation of a black oxide film on the obtained noble metal alloy casting but also hardens the investment material when used for casting a noble metal alloy for dental casting. It has favorable physical properties in terms of time, hardening expansion, thermal expansion, and compressive strength.
【００３０】[0030]
【実施例】以下に実施例により本発明をより具体的に説
明するが、本発明はこれらに限定されない。EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the present invention is limited thereto.
【００３１】[0031]
【実施例１】歯科用クリストバライト埋没材（珪石粉末
３０質量％、クリストバライト４０質量％、α型半水石
膏３０質量％）１０００ｇに、ホウ素１２．５ｇを正確
に秤量して添加した。これをボールミルに装入して、５
０回／分の回転速度で３０分間混合して細粉状とした。
これを３００メッシュ篩で篩別して、歯科鋳造用埋没材
Ａを得た。Example 1 12.5 g of boron was accurately weighed and added to 1000 g of dental cristobalite investment material (silica powder 30% by mass, cristobalite 40% by mass, α-type hemihydrate gypsum 30% by mass). This is charged into a ball mill and 5
The mixture was mixed at a rotation speed of 0 times / minute for 30 minutes to form a fine powder.
This was sieved with a 300 mesh sieve to obtain an investment material A for dental casting.
【００３２】次いで歯科鋳造用埋没材Ａ１００ｇに精製
水３４ｍｌを加え６０秒間よく練和して、予め作成して
おいたスプルーを有する橋義歯型ワックス材料及び金冠
型ワックス材料を埋没して３０分間硬化させた。該埋没
材を７００℃の電気炉に入れ、３０分間同じ温度を保持
してワックス材料を焼却除去して、ＪＩＳで規定されて
いるタイプIV金合金の溶融物（融点９４０℃）を注入し
冷却して、鋳造物を得た。Next, 34 ml of purified water is added to 100 g of the investment material A for dental casting, and the mixture is thoroughly kneaded for 60 seconds. The bridge denture-type wax material and the crown-shaped wax material having the sprue prepared in advance are embedded and cured for 30 minutes. I let it. The investment material is placed in an electric furnace at 700 ° C., and the same temperature is maintained for 30 minutes to burn off the wax material. Then, a melt of type IV gold alloy (melting point: 940 ° C.) specified by JIS is injected and cooled Then, a casting was obtained.
【００３３】鋳造物は、黒色酸化膜が全く認められず、
図３（ａ）に示すように地金の色に近い色を有する橋義
歯鋳造物及び金冠鋳造物であった。In the casting, no black oxide film was observed at all,
As shown in FIG. 3A, a bridge denture casting and a gold crown casting having a color close to the color of the ingot were obtained.
【００３４】歯科鋳造用埋没材Ａの硬化時間、硬化膨
張、熱膨張、圧縮強さを以下のように測定した。評価結
果を表１に示す。 ＜硬化時間の測定＞ＪＩＳ Ｔ６６０１に従って以下の
ように硬化時間の測定を行った。The curing time, curing expansion, thermal expansion, and compressive strength of the investment material A for dental casting were measured as follows. Table 1 shows the evaluation results. <Measurement of curing time> The curing time was measured in accordance with JIS T6601 as follows.
【００３５】耐腐食性で非吸水性の型に、埋没材１００
ｇに対し水３４ｍｌで練和したものを充填する。練和を
開始したときから、質量３００ｇのビカー針（針の直径
１ｍｍ）が型の底部５ｍｍ以内に対して最初に貫通でき
なくなるまでの時間を測定した。この試験を３回行い、
平均値を硬化時間とした。 ＜硬化膨張の測定＞硬化膨張は、埋没材の試験片（ＪＩ
Ｓで規格された、長さ５０±１ｍｍで円形の均一な横断
面を持つ試験片を用い、試験片の横断面は７８〜２７５
ｍｍ2の範囲とする）の長さ方向の線膨張率とし、硬化
時間２分後に零点を設定して、練和開始２０分後に測定
する。The investment material 100 is placed in a corrosion-resistant, non-water-absorbing mold.
A mixture kneaded with 34 ml of water per g is charged. The time from when kneading was started until the Vicat needle (needle diameter: 1 mm) weighing 300 g could not penetrate for the first time within 5 mm of the bottom of the mold was measured. Perform this test three times,
The average value was taken as the curing time. <Measurement of hardening expansion> Hardening expansion was measured using a test piece of investment material (JI
A test piece having a uniform cross section of 50 ± 1 mm in length and having a circular shape specified by S was used, and the cross section of the test piece was 78 to 275.
and mm and 2 range) in the longitudinal direction of the linear expansion coefficient, and set the zero point after 2 minutes curing time is measured after the start of mixing 20 minutes.
【００３６】試験中は、試験片に膨張を抑制する力が加
わらないようにし、試験片に加えられる計測圧力は、
２．４ｋＰａを超えてはならない。この試験を３回行
い、平均値を硬化膨張率とした。硬化膨張計として石膏
の硬化膨張を計測する膨張計を用いた。 ＜熱膨張の測定＞熱膨張の測定には、熱分析システム
（ＲＩＧＡＫＵ：先端研究センター）を用いた。試験片
は、耐腐食性で非吸水性の型に埋没材１００ｇに対し水
３４ｍｌで練和したものを充填して、寸法と形態は熱分
析システムに対応したもの（ＪＩＳで規格された、長さ
５０±１ｍｍで円形の均一な横断面を持つ試験片を用
い、試験片の横断面は７８〜２７５ｍｍ2の範囲とす
る）として作成した。硬化後は、試験片に膨張を抑制す
る力が加わらないようにする。During the test, a force for suppressing expansion was not applied to the test piece, and the measured pressure applied to the test piece was:
It must not exceed 2.4 kPa. This test was performed three times, and the average value was taken as the cure expansion coefficient. A dilatometer for measuring the setting expansion of gypsum was used as a setting dilatometer. <Measurement of Thermal Expansion> A thermal analysis system (RIGAKU: Advanced Research Center) was used for the measurement of thermal expansion. A test piece is filled with a corrosion-resistant, non-water-absorbing mold mixed with 100 g of investment material with 34 ml of water, and the size and form conform to the thermal analysis system (JIS standard, long length). A test piece having a uniform cross section of 50 ± 1 mm and a circular cross section was used, and the cross section of the test piece was in the range of 78 to 275 mm 2 . After curing, the test piece is prevented from being subjected to a force that suppresses expansion.
【００３７】練和開始２時間後に試験片を熱膨張測定装
置に入れて加熱し、７００℃における長さの変化を測定
して、元の長さに対する変化率を求めた。試験中に試験
片に加えられる計測圧力は、２．４ｋＰａを超えてはな
らない。この試験を３回行い、平均値を熱膨張率とし
た。 ＜圧縮強さ試験＞ガラス板上においた金属型（内径２０
ｍｍ、高さ３０ｍｍ）に、埋没材１００ｇに対し水３４
ｍｌで練和したものを充填し、金属型の上面にもガラス
板をかぶせる。取り扱いに耐える程度に硬化させてから
（硬化時間経過後）、金属型から試験片を抜き取って、
温度２３±２℃、相対湿度９５〜１００％に保管した。
練和開始２時間後に圧縮試験を行った。圧縮試験は、ク
ロスヘッドスピード１ｍｍ／ｍｉｎで行った。この試験
を３回行い、平均値を圧縮強さとした。Two hours after the start of kneading, the test piece was placed in a thermal expansion measuring apparatus and heated, and the change in length at 700 ° C. was measured to determine the rate of change with respect to the original length. The measured pressure applied to the specimen during the test shall not exceed 2.4 kPa. This test was performed three times, and the average value was defined as the coefficient of thermal expansion. <Compression strength test> A metal mold (inner diameter 20
mm, height 30 mm), water 34
Fill the mixture kneaded with ml and cover the top surface of the metal mold with a glass plate. After hardening enough to withstand handling (after the curing time has elapsed), remove the test piece from the metal mold,
Stored at a temperature of 23 ± 2 ° C. and a relative humidity of 95-100%.
A compression test was performed 2 hours after the start of kneading. The compression test was performed at a crosshead speed of 1 mm / min. This test was performed three times, and the average value was defined as the compressive strength.
【００３８】[0038]
【表１】 [Table 1]
【００３９】[0039]
【実施例２】ＪＩＳに定められた金・銀・パラジウム合
金を用いる以外は実施例１と同様にして、鋳造物を得
た。なお、金・銀・パラジウム合金の溶融温度は９６０
℃であった。Example 2 A casting was obtained in the same manner as in Example 1 except that a gold / silver / palladium alloy specified by JIS was used. The melting temperature of the gold / silver / palladium alloy is 960
° C.
【００４０】鋳造物は、黒色酸化膜が全く認められず、
図４（ｃ）に示すように白金色の金・銀・パラジウム合
金製の橋義歯鋳造体及び金冠鋳造体であった。In the casting, no black oxide film was observed.
As shown in FIG. 4 (c), it was a platinum-colored gold / silver / palladium alloy bridge denture casting and a gold crown casting.
【００４１】[0041]
【比較例１】市販の歯科鋳造用埋没材Ｂ（珪石粉末３０
質量％、クリストバライト４０質量％、α型半水石膏３
０質量％）１００ｇを精製水３４ｍｌを加え３０秒間よ
く練和して、蝋型に埋没して硬化させ、３０分後に７０
０℃の電気炉に入れ、３０分間同じ温度を保持してワッ
クス材料を焼却して、ＪＩＳで規定されているタイプIV
金合金を鋳造して、鋳造物を得た。図３（ｂ）に示すよ
うに、鋳造物は黒色酸化膜が全面に発生していた。Comparative Example 1 Commercially available investment material for dental casting B (silica powder 30
Mass%, cristobalite 40 mass%, α-type hemihydrate gypsum 3
(0% by mass), 100 ml of purified water was added to 34 ml of purified water, kneaded well for 30 seconds, buried in a wax mold and cured.
Place in an electric furnace at 0 ° C. and incinerate the wax material while maintaining the same temperature for 30 minutes. Type IV specified in JIS
A gold alloy was cast to obtain a casting. As shown in FIG. 3 (b), the casting had a black oxide film on the entire surface.
【００４２】歯科鋳造用埋没材Ｂの硬化時間、硬化膨
張、熱膨張、圧縮強さを実施例１と同様に測定した。評
価結果を表１に示す。The curing time, curing expansion, thermal expansion, and compressive strength of the investment material B for dental casting were measured in the same manner as in Example 1. Table 1 shows the evaluation results.
【００４３】[0043]
【比較例２】ＪＩＳに定められた金・銀・パラジウム合
金を用いる以外は比較例１と同様にして、鋳造物を得
た。図４（ｄ）に示すように、鋳造物は黒色酸化膜が全
面に発生していた。Comparative Example 2 A casting was obtained in the same manner as in Comparative Example 1 except that a gold / silver / palladium alloy specified by JIS was used. As shown in FIG. 4 (d), the casting had a black oxide film on the entire surface.
【００４４】[0044]
【発明の効果】本発明によれば、本発明の歯科鋳造物用
埋没材は酸化防止元素が含まれているため、金合金、金
・銀・パラジウム合金等の鋳造用貴金属合金を、歯科鋳
造用埋没材を用いて鋳造する際、得られた鋳造物の黒色
酸化膜の発生を防止することができる。そのため、鋳造
後の酸処理等をする必要がないことから、工業的価値は
大きい。According to the present invention, since the investment material for dental casting of the present invention contains an antioxidant element, a noble metal alloy for casting, such as a gold alloy, gold / silver / palladium alloy, is used for dental casting. When casting is performed using the investment investment material, the formation of a black oxide film on the obtained casting can be prevented. Therefore, there is no need to perform an acid treatment or the like after casting, so that the industrial value is great.
【図１】 本発明の歯科鋳造用埋没材を用いて製造した
金合金鋳造物（ａ）と従来の歯科鋳造用埋没材を用いて
製造した金合金鋳造物（ｂ）の写真を示す。FIG. 1 shows photographs of a gold alloy casting (a) manufactured using the investment material for dental casting of the present invention and a gold alloy casting (b) manufactured using the conventional investment material for dental casting.
【図２】 本発明の歯科鋳造用埋没材を用いて製造した
金・銀・パラジウム合金鋳造物（ｃ）と従来の歯科鋳造
用埋没材を用いて製造した金・銀・パラジウム合金鋳造
物（ｄ）の写真を示す。FIG. 2 shows a gold / silver / palladium alloy casting (c) produced using the investment material for dental casting of the present invention and a gold / silver / palladium alloy casting produced using the conventional investment material for dental casting ( The photograph of d) is shown.
【図３】 実施例１と比較例１で得られた金合金鋳造物
の写真を示す。FIG. 3 shows photographs of gold alloy castings obtained in Example 1 and Comparative Example 1.
【図４】 実施例２と比較例２で得られた金・銀・パラ
ジウム合金鋳造物の写真を示す。FIG. 4 shows photographs of gold / silver / palladium alloy castings obtained in Example 2 and Comparative Example 2.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 後藤 真一 新潟県新潟市浜浦町１−８ 日本歯科大学 新潟歯学部内 Ｆターム(参考） 4C059 HH43 4E092 AA02 AA04 AA08 AA09 BA13 CA03 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shinichi Goto 1-8 Hamauracho, Niigata City, Niigata Prefecture Nippon Dental University Niigata Dental School F-term (reference) 4C059 HH43 4E092 AA02 AA04 AA08 AA09 BA13 CA03
Claims (5)
れ、耐火材と結合材とを少なくとも含む歯科鋳造用埋没
材において、酸化防止元素を含むことを特徴とする歯科
鋳造用埋没材。1. An investment material for dental casting, which is used for casting a noble metal alloy for dental casting and contains at least a refractory material and a binder, wherein the investment material contains an antioxidant element.
前記結合材が石膏である請求項１記載の歯科鋳造用埋没
材。2. The refractory material is cristobalite,
The investment material for dental casting according to claim 1, wherein the bonding material is gypsum.
ン、アルミニウム、クロム、スズ、ジルコニウム、バナ
ジウム、セリウム及び亜鉛からなる群から選ばれる１つ
またはそれ以上の組み合わせである請求項１又は２に記
載の歯科鋳造用埋没材。3. The antioxidant element according to claim 1, wherein the antioxidant element is one or more selected from the group consisting of boron, silicon, aluminum, chromium, tin, zirconium, vanadium, cerium, and zinc. Investment for dental casting.
元素の含有量は、０．００１〜１５質量％である請求項
１〜３のいずれか一項に記載の歯科鋳造用埋没材。4. The investment material for dental casting according to claim 1, wherein the content of the antioxidant element relative to the total amount of the investment material for dental casting is 0.001 to 15% by mass.
１２００℃以下で鋳造に供されるためのものである請求
項１〜４のいずれか一項に記載の歯科鋳造用埋没材。5. The investment material for dental casting according to claim 1, wherein the investment material for dental casting is used for casting at a temperature of 800 ° C. or more and 1200 ° C. or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001150923A JP2002336276A (en) | 2001-05-21 | 2001-05-21 | Dental casting implant material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001150923A JP2002336276A (en) | 2001-05-21 | 2001-05-21 | Dental casting implant material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002336276A true JP2002336276A (en) | 2002-11-26 |
Family
ID=18995864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001150923A Pending JP2002336276A (en) | 2001-05-21 | 2001-05-21 | Dental casting implant material |
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| Country | Link |
|---|---|
| JP (1) | JP2002336276A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007029785A1 (en) | 2005-09-07 | 2007-03-15 | Ihi Corporation | Mold, method for manufacture of the mold, and molded article using the mold |
-
2001
- 2001-05-21 JP JP2001150923A patent/JP2002336276A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007029785A1 (en) | 2005-09-07 | 2007-03-15 | Ihi Corporation | Mold, method for manufacture of the mold, and molded article using the mold |
| EP1938918A1 (en) * | 2005-09-07 | 2008-07-02 | IHI Corporation | Mold, method for manufacture of the mold, and molded article using the mold |
| EP1938918A4 (en) * | 2005-09-07 | 2008-08-27 | Ihi Corp | Mold, method for manufacture of the mold, and molded article using the mold |
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