JPH07103006B2 - Dental investment material and dental investment mold - Google Patents
Dental investment material and dental investment moldInfo
- Publication number
- JPH07103006B2 JPH07103006B2 JP3128447A JP12844791A JPH07103006B2 JP H07103006 B2 JPH07103006 B2 JP H07103006B2 JP 3128447 A JP3128447 A JP 3128447A JP 12844791 A JP12844791 A JP 12844791A JP H07103006 B2 JPH07103006 B2 JP H07103006B2
- Authority
- JP
- Japan
- Prior art keywords
- powder
- dental investment
- quartz
- investment material
- mold
- 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.)
- Expired - Fee Related
Links
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- Dental Preparations (AREA)
- Mold Materials And Core Materials (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は急速焼成してもクラッ
ク、割れ、破壊等の発生がない歯科用埋没材鋳型を安価
に提供できる歯科用埋没材およびこの歯科用埋没材を用
いて成形した歯科用埋没材鋳型に関するものである。INDUSTRIAL APPLICABILITY The present invention relates to a dental investment material which can inexpensively provide a dental investment material mold which does not cause cracks, cracks, breakage or the like even if it is rapidly fired, and molding using this dental investment material. The present invention relates to a dental investment material mold.
【０００２】[0002]
【従来の技術】従来の歯科用埋没材鋳型を成形する歯科
用埋没材としては、焼石膏にクリストバライトを加配し
た石膏ークリストバライト系埋没材と、焼石膏に石英を
加配した石膏ー石英系埋没材とが広く使用されている。2. Description of the Related Art As a dental investment material for molding a conventional dental investment material mold, gypsum cristobalite investment material in which cristobalite is added to calcined gypsum and gypsum-quartz investment material in which quartz is added to calcined gypsum And are widely used.
【０００３】ところで、この種歯科用埋没材鋳型はワッ
クス歯型を用いて成形後加熱・脱ロウ処理して得られる
中空体であるが、これを用いて鋳造品を得るにはこれを
焼成温度700 ℃程度の指定焼成温度で焼成して中空部に
鋳造用合金材料を注入するので、この焼成工程で鋳型に
クラック、割れ、破壊等が発生しないように室温程度の
低温より徐々に指定焼成温度まで昇温させていた。この
ため、昇温に長時間を要するとともに次の鋳造をするに
は焼成炉の温度を常温近くまで降温する必要があり、ロ
スタイムが大きく作業効率が極めて悪いという問題点が
あった。また、急加熱ができないので急を要する場合に
は対応できないという問題点や、焼成炉の昇降温のサイ
クルが激しいので損傷が著しく焼成炉の寿命が短くなる
という問題点もあった。By the way, this type of dental investment material mold is a hollow body obtained by heating and dewaxing after molding using a wax tooth mold, and in order to obtain a cast product using this, the baking temperature is used. Since the casting alloy material is injected into the hollow part after firing at the specified firing temperature of about 700 ° C, the firing temperature is gradually set from the low temperature of about room temperature so that the mold does not crack, break, or break during this firing process. Had been heated up to. Therefore, there is a problem that it takes a long time to raise the temperature and the temperature of the firing furnace needs to be lowered to near room temperature for the next casting, resulting in a large loss time and extremely poor work efficiency. In addition, there is a problem that rapid heating cannot be performed because it cannot be dealt with in a case where it is urgent, and that the cycle of temperature raising and lowering of the firing furnace is violently damaged and the life of the firing furnace is shortened.
【０００４】[0004]
【発明が解決しようとする課題】本発明は上記のような
従来の問題点を解決して、急加熱による昇温を行っても
クラック、割れ、破壊等の発生がなくて鋳造時間の大巾
な短縮ができるうえに急を要する場合にも即座に対応し
て鋳型を成形することができ、更には一回の鋳造処理毎
に焼成炉を常温まで降温する必要もなく優れた作業効率
を付与することができる歯科用埋没材鋳型を簡単に提供
できる歯科用埋没材およびこの歯科用埋没材を用いて成
形した歯科用埋没材鋳型を提供することを目的として完
成されたものである。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and does not cause cracks, cracks, breakage or the like even when the temperature is raised by rapid heating, and the casting time is wide. The mold can be shortened and the mold can be immediately formed even when it is urgent. Furthermore, it is not necessary to cool the firing furnace to room temperature for each casting process, giving excellent work efficiency. The present invention has been completed for the purpose of providing a dental investment material that can easily provide a dental investment material mold that can be manufactured, and a dental investment material mold formed by using the dental investment material.
【０００５】[0005]
【課題を解決するための手段】上記の課題を解決するた
めになされた本発明は、焼石膏と、平均粒径が５〜１５
μm のクリストバライトおよび石英の各粉状物がいずれ
も２０重量％より多く配合されたものを主成分として、
これに無機塩類と前記クリストバライトおよび石英の平
均粒径よりも大きな粒径の耐火材料粉末からなる通気度
増大用成分を添加したことを特徴とする歯科用埋没材を
第１の発明とし、焼石膏と、平均粒径が５〜１５μm の
クリストバライトおよび石英の各粉状物がいずれも２０
重量％より多く配合されたものを主成分として、これに
無機塩類と前記クリストバライトおよび石英の平均粒径
よりも大きな粒径の耐火材料粉末からなる通気度増大用
成 分を添加した歯科用埋没材よりなり、通気度が0.04cm
／分以上であることを特徴とする歯科用埋没材鋳型を第
２の発明とするものである。DISCLOSURE OF THE INVENTION The present invention, which was made to solve the above-mentioned problems, comprises calcined gypsum and an average particle size of 5 to 15
μm cristobalite and quartz powder
Also, the main component is a mixture of more than 20% by weight,
In addition to this, inorganic salts and the above-mentioned cristobalite and quartz
Air permeability consisting of refractory material powder with a particle size larger than the average particle size
The dental investing material, characterized in that the addition of enhancing component to the first invention, a calcined gypsum, an average particle size of 5~15μm
20 for each cristobalite and quartz powder
The main component is a mixture of more than wt%
Average particle size of inorganic salts and cristobalite and quartz
For increasing air permeability consisting of refractory powder with a larger particle size
Ingredients made from dental investment material was added, the air permeability is 0.04cm
The second aspect of the present invention is a dental investment material mold characterized in that it is not less than 1 / min .
【０００６】本発明において主成分となる焼石膏、クリ
ストバライト、石英のうち焼石膏はバインダーとして用
いられ、クリストバライト、石英は耐火材料としてもち
いられるものであるが、バインダーとしての焼石膏に耐
火材料としてクリストバライトと石英を共に添加するこ
とによって初めて焼成時における熱膨脹が有効に分散さ
れるもので、これにより従来できなかった急加熱が可能
となる。なお、耐火材料であるクリストバライトおよび
石英はいずれも平均粒径が５〜１５μ程度の紛状物とし
て前記バインダーである焼石膏との混合が均一かつ容易
に行えるよう調整されている。また、焼石膏、クリスト
バライト、石英の各粉状物はいずれも２０重量％以上配
合されるものであり、いずれかが２０重量％に満たない
場合には熱膨脹の十分な分散が行われ難く、急加熱した
場合にクラック、割れ、破壊等を発生させるおそれが生
じる。Among the main components of calcined gypsum, cristobalite, and quartz in the present invention, calcined gypsum is used as a binder, and cristobalite and quartz are also used as refractory materials. However, calcined gypsum as a binder is used as a refractory material. The thermal expansion during firing is effectively dispersed for the first time by adding both and quartz together, which enables rapid heating, which was not possible in the past. The refractory materials cristobalite and quartz are both powders having an average particle size of about 5 to 15 μm, and are adjusted so that they can be uniformly and easily mixed with calcined gypsum as the binder. Further, each of the powdered substances of calcined gypsum, cristobalite, and quartz is mixed in an amount of 20% by weight or more. If either of them is less than 20% by weight, it is difficult to sufficiently disperse the thermal expansion. When heated, there is a risk that cracks, breaks, breakage, etc. may occur.
【０００７】また、主成分である焼石膏、クリストバラ
イト、石英の各粉状物に添加される通気度増大用成分
は、急加熱した場合の焼成時における未反応または遊離
してくる水分の蒸発に伴う水蒸気圧力を有効に透過させ
るよう鋳型に十分な通気度を付与するためのもので、こ
れにより急加熱した場合に前記水蒸気圧力によるクラッ
ク、割れ、破壊等の発生はさらに有効に防止される。通
気度増大用成分は無機塩類と耐火材料粉末の混合物が用
いられ、無機塩類としてはアクリル酸カルシウム、硫酸
カリウム、塩化ナトリウム等から選ばれた１種または２
種以上のものが用いられ、また耐火材料粉末としては熔
融石英粉末、ムライト粉末、アルミナ粉末等の耐火材料
粉末から選ばれた１種または２種以上のものが用いられ
る。そして、通気度増大用成分は前記主成分に対して例
えば１０重量％程度以下の割合で添加される。また、通
気度増大用成分として耐火材料粉末を用いる場合には、
クリストバライトおよび石英の平均粒径よりも大きな例
えば２０〜３０μ程度の平均粒径のものを用いる。 Further, the component for increasing air permeability added to each of the powdery substances of calcined gypsum, cristobalite and quartz, which are the main components, is used for evaporation of unreacted or liberated water during firing when rapidly heated. The purpose of this is to impart sufficient air permeability to the mold so as to effectively permeate the water vapor pressure that accompanies it, whereby cracking, cracking, breakage and the like due to the water vapor pressure can be more effectively prevented in the case of rapid heating. Communication
A mixture of inorganic salts and refractory powder is used as the component for increasing the temper.
Inorganic salts include calcium acrylate and sulfuric acid
1 or 2 selected from potassium, sodium chloride, etc.
More than one kind is used, and the refractory powder is melted.
Refractory materials such as fused silica powder, mullite powder, and alumina powder
One or more selected from powders are used
It And the component for increasing air permeability is
For example, it is added at a ratio of about 10% by weight or less. Also,
When using refractory material powder as a component for increasing the temper,
Examples larger than average grain size of cristobalite and quartz
For example, an average particle size of about 20 to 30 μm is used.
【０００８】しかして、歯科用埋没材を用いて歯科用埋
没材鋳型を製造するには、例えば、歯科用埋没材１００
重量部に対して水２０〜４０重量部を添加して十分に混
練し、これによりワックス歯型を埋没して得られるもの
であり、また、このようにして成形された歯科用埋没材
鋳型は脱ロウ処理により形成された中空部に鋳造用合金
材料の溶湯を鋳込んでクラウン、ブリッジ等の所定の鋳
造品を得ることは従来のものと変わることはないが、本
発明での歯科用埋没材鋳型は、焼成時において焼成開始
温度をいきなり350 ℃以上として指定焼成温度である例
えば700 ℃まで急速に昇温してもクラック、割れ、破壊
等の発生がない。その理由は歯科用埋没材がバインダー
としての焼石膏に加えて耐火材料としてのクリストバラ
イトおよび石英の両方を合わせ配合して主成分としてあ
るので、焼成時における熱膨張を有効に分散させること
ができ、更には、通気度増大用成分も添加されているの
で水分の蒸発に伴う水蒸気圧力を有効に透過させること
ができ、従って、例えば図１に示されるように焼成開始
温度をいきなり350 ℃（折線Ａで図示）として焼成を行
って折線Ｂで図示したように焼成開始温度を500 ℃とす
ることも、更には直線Ｃで図示したように焼成開始温度
を700 ℃としてよく、従来の常温から焼成を開始する曲
線Ｓに比べて飛躍的に焼成時間の短縮化を実現できるこ
ととなる。In order to manufacture a dental investment material mold using the dental investment material, for example, the dental investment material 100 is used.
20 to 40 parts by weight of water is added to parts by weight, and the mixture is sufficiently kneaded to obtain a wax tooth mold by burying it, and the dental investment material mold thus formed is Casting the melt of the casting alloy material into the hollow portion formed by the dewaxing treatment to obtain a predetermined cast product such as a crown or a bridge is no different from the conventional one, but it is a dental implant in the present invention. The material mold does not crack, break, or break even when the firing start temperature is suddenly raised to 350 ° C. or more during firing and the temperature is rapidly raised to a specified firing temperature, for example, 700 ° C. The reason for this is that the dental investment material is a main component by combining both cristobalite and quartz as a refractory material in addition to calcined gypsum as a binder, so that the thermal expansion during firing can be effectively dispersed, Furthermore, since the component for increasing the air permeability is also added, it is possible to effectively permeate the water vapor pressure associated with the evaporation of water, and therefore, for example, as shown in FIG. The firing start temperature may be set to 500 ° C. as shown by the polygonal line B, or the firing start temperature may be set to 700 ° C. as shown by the straight line C. Compared with the starting curve S, the firing time can be dramatically shortened.
【０００９】以上のようにして得られた歯科用埋没材鋳
型は、通気度が0.04cm／分以上であって焼成工程におけ
る水蒸気圧力を有効に透過することができ、焼成後にお
いてもクラック、割れ、破壊等の発生がなく、しかも、
鋳型の表面性状も極めて滑沢で優れたものである。な
お、前記の通気度はテストピースを載置した通気台の両
端に差圧計と水を貯めた容器とを連通させ、該容器から
の単位時間当たりの排出水量と差圧から次式、通気度
（cm／分）＝〔排出水量（cm3 ）×テストピース高さ
（cm）〕／〔テストピース断面積（cm2 ）×差圧（cm）
×時間（分）〕によって計算されるものである。The dental investment material mold obtained as described above has an air permeability of 0.04 cm / min or more and can effectively permeate the water vapor pressure in the firing step, and cracks and cracks even after firing. No damage, etc., and
The surface properties of the mold are also extremely smooth and excellent. In addition, the above-mentioned air permeability is obtained by connecting the differential pressure gauge and the container storing water to both ends of the aeration table on which the test piece is placed, and using the following formula, the air permeability from the discharged water amount per unit time from the container and the differential pressure. (Cm / min) = [Discharged water amount (cm 3 ) x test piece height (cm)] / [test piece cross-sectional area (cm 2 ) x differential pressure (cm)
X time (minutes)].
【００１０】[0010]
【実施例】表１に示されるように、焼石膏、クリストバ
ライト、石英を主成分とした基本配合の歯科用埋没材１
００重量部に対して、通気度増大用成分５重量部を添加
して混水量を３３％とした混練物で、ワックス歯型を埋
没して歯科用埋没材鋳型を成形した。その後、この歯科
用埋没材鋳型を焼成開始温度を500 ℃として700 ℃まで
急加熱し、ワックス歯型が流出して形成された中空部内
に鋳造用合金材料の溶湯を鋳込んで所定の鋳造品を得
た。得られた歯科用埋没材鋳型にはいずれもクラック、
割れ、破壊等がなく、しかも、型の表面性状も極めて滑
沢で優れたものであり、品質の高い鋳造品を成形するこ
とができた。[Examples] As shown in Table 1, a dental investment material 1 having a basic composition mainly composed of calcined gypsum, cristobalite, and quartz 1
5 parts by weight of the component for increasing air permeability was added to 00 parts by weight of the mixture, and the wax tooth mold was embedded in the kneaded product to form a dental investment material mold. After that, this dental investment material mold is rapidly heated to 700 ° C with the firing start temperature set to 500 ° C, and the molten metal of the casting alloy material is cast into the hollow portion formed by the wax tooth mold flowing out, and the predetermined casting product is obtained. Got All of the obtained dental investment material molds had cracks,
There was no cracking or breakage, and the surface properties of the mold were extremely smooth and excellent, and a high quality cast product could be formed.
【表１】 [Table 1]
【００１１】[0011]
【発明の効果】以上の説明からも明らかなように、第１
の発明においては、急加熱による昇温を行ってもクラッ
ク、割れ、破壊等の発生がない歯科用埋没材鋳型を常法
により簡単に成形できるものであり、また、第２の発明
は急加熱による昇温を行ってもクラック、割れ、破壊等
の発生がないので、急速に焼成することができて鋳造時
間の大巾な短縮ができるとともに急を要する場合にも即
座に対応でき、また、焼成開始温度が高温であるため一
回の鋳造処理毎に焼成炉を常温まで降温する必要もなく
て作業効率を高めるとともに省エネルギー上の効果もあ
り、また、第２の発明の歯科用埋没材鋳型による鋳造品
はクラック、割れ、破壊等の発生がないので表面性状が
滑沢で品質の優れたものとなるなど多くの利点がある。
よって、本発明は従来の問題点を一掃した歯科用埋没材
および歯科用埋没材鋳型として産業の発展に寄与すると
ころは極めて大である。As is apparent from the above description, the first
In the invention of claim 1, a dental investment material mold that does not cause cracks, cracks, breakage or the like even if the temperature is raised by rapid heating can be easily molded by a conventional method, and the second invention is rapid heating. Since there is no cracking, cracking, breakage, etc. even when the temperature is raised by, it is possible to rapidly sinter and greatly reduce the casting time and to immediately respond even when there is an urgent need. Since the firing start temperature is high, there is no need to cool the firing furnace to room temperature for each casting process, which not only improves work efficiency but also has an energy saving effect. Further, the dental investment material mold of the second invention Since there is no crack, breakage, breakage or the like in the cast product, there are many advantages such as smooth surface quality and excellent quality.
Therefore, the present invention greatly contributes to the industrial development as a dental investment material and a dental investment material mold that have eliminated the conventional problems.
【図１】焼成工程における昇温カーブを示すグラフであ
る。FIG. 1 is a graph showing a temperature rise curve in a firing process.
Claims (3)
リストバライトおよび石英の各粉状物がいずれも２０重
量％より多く配合されたものを主成分として、これに無
機塩類と前記クリストバライトおよび石英の平均粒径よ
りも大きな粒径の耐火材料粉末からなる通気度増大用成
分を添加したことを特徴とする歯科用埋没材。 1. A calcined gypsum and a black powder having an average particle size of 5 to 15 μm.
20 layers of each powder of ristobalite and quartz
The main component is a mixture of more than 100%,
It depends on the average grain size of machine salt and cristobalite and quartz.
A composition that increases the air permeability of refractory material powder with a very large particle size.
The dental investment material is characterized by the addition of a component.
ム、硫酸カリウム、塩化ナトリウム等の無機塩類から選
ばれた１種または２種以上のものと、熔融石英粉末、ム
ライト粉末、アルミナ粉末等の耐火材料粉末から選ばれ
た１種または２種以上のものからなる請求項１に記載の
歯科用埋没材。2. A component for increasing air permeability, which is one or more selected from inorganic salts such as calcium acrylate, potassium sulfate and sodium chloride, and a fire resistant material such as fused quartz powder, mullite powder and alumina powder. The dental investment material according to claim 1, comprising one or more selected from material powders.
リストバライトおよび石英の各粉状物がいずれも２０重
量％より多く配合されたものを主成分として、これに無
機塩類と前記クリストバライトおよび石英の平均粒径よ
りも大きな粒径の耐火材料粉末からなる通気度増大用成
分を添加した歯科用埋没材よりなり、通気度が0.04cm／
分以上であることを特徴とする歯科用埋没材鋳型。 3. A calcined gypsum and a black powder having an average particle size of 5 to 15 μm.
20 layers of each powder of ristobalite and quartz
The main component is a mixture of more than 100%,
It depends on the average grain size of machine salt and cristobalite and quartz.
A composition that increases the air permeability of refractory material powder with a very large particle size.
Made of dental investment material with added content, with air permeability of 0.04 cm /
The dental investment material mold is characterized by being more than a minute.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3128447A JPH07103006B2 (en) | 1991-04-30 | 1991-04-30 | Dental investment material and dental investment mold |
| US07/866,901 US5373891A (en) | 1991-04-30 | 1992-04-06 | Investment material and mold for dental use and burnout thereof |
| DE69212059T DE69212059T2 (en) | 1991-04-30 | 1992-04-14 | Dental investment and casting mold and method for firing the same |
| EP92106431A EP0511546B1 (en) | 1991-04-30 | 1992-04-14 | Investment material and mold for dental use and burnout thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3128447A JPH07103006B2 (en) | 1991-04-30 | 1991-04-30 | Dental investment material and dental investment mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04330006A JPH04330006A (en) | 1992-11-18 |
| JPH07103006B2 true JPH07103006B2 (en) | 1995-11-08 |
Family
ID=14984946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3128447A Expired - Fee Related JPH07103006B2 (en) | 1991-04-30 | 1991-04-30 | Dental investment material and dental investment mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07103006B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9834480B2 (en) | 2012-04-27 | 2017-12-05 | Yoshino Gypsum Co., Ltd. | Gypsum-based embedding material composition for casting |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040020621A (en) * | 2002-08-31 | 2004-03-09 | 김경남 | Gypsum-bonded investment using alpha type gypsum |
| KR100864717B1 (en) * | 2007-04-18 | 2008-10-23 | 주식회사 삼우 | Plastery Investment used for Investment casting |
| KR101632543B1 (en) | 2012-06-18 | 2016-06-21 | 요시노 셋고 가부시키가이샤 | Casting investment composition and casting process using same |
| EP3693099A4 (en) * | 2017-10-05 | 2021-02-17 | Yoshino Gypsum Co., Ltd. | Gypsum-based investment material composition for casting, and method for manufacturing gypsum-based investment material composition for casting |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6031786B2 (en) * | 1982-08-13 | 1985-07-24 | 而至歯科工業株式会社 | Setsukou composition for denture implantation |
| JPS61193741A (en) * | 1985-02-22 | 1986-08-28 | Haidentaru Service Kk | Investment casting material for dental purpose |
| JPS63141906A (en) * | 1986-12-03 | 1988-06-14 | G C Dental Ind Corp | Embedding material for dental molding |
| JP2515161B2 (en) * | 1988-11-24 | 1996-07-10 | 株式会社ジーシーデンタルプロダクツ | Dental gypsum composition |
-
1991
- 1991-04-30 JP JP3128447A patent/JPH07103006B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9834480B2 (en) | 2012-04-27 | 2017-12-05 | Yoshino Gypsum Co., Ltd. | Gypsum-based embedding material composition for casting |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04330006A (en) | 1992-11-18 |
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