JPH0437435A - Investment for dentistry casting - Google Patents
Investment for dentistry castingInfo
- Publication number
- JPH0437435A JPH0437435A JP2141889A JP14188990A JPH0437435A JP H0437435 A JPH0437435 A JP H0437435A JP 2141889 A JP2141889 A JP 2141889A JP 14188990 A JP14188990 A JP 14188990A JP H0437435 A JPH0437435 A JP H0437435A
- Authority
- JP
- Japan
- Prior art keywords
- investment
- fused silica
- thermal expansion
- coefficient
- cristobalite
- 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
- 238000005266 casting Methods 0.000 title claims abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 59
- 239000000463 material Substances 0.000 claims abstract description 51
- 239000005350 fused silica glass Substances 0.000 claims abstract description 23
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 15
- 239000011230 binding agent Substances 0.000 claims abstract description 8
- 239000011819 refractory material Substances 0.000 claims description 16
- 239000010453 quartz Substances 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 abstract description 17
- 239000002184 metal Substances 0.000 abstract description 17
- 239000000203 mixture Substances 0.000 abstract description 4
- 150000002739 metals Chemical class 0.000 description 5
- 239000003015 dental casting investment Substances 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 239000008119 colloidal silica Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 235000002639 sodium chloride Nutrition 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 229910000599 Cr alloy Inorganic materials 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229940124024 weight reducing agent Drugs 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- 229910001020 Au alloy Inorganic materials 0.000 description 1
- 229910001252 Pd alloy Inorganic materials 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- -1 crowns Chemical class 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003353 gold alloy Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
本発明は、鋳造する金属の凝固と冷却に伴う収縮を補償
するための熱膨張を正確に制御可能にした歯科鋳造用埋
没材に関するものである。[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a dental casting investment material that allows accurate control of thermal expansion to compensate for shrinkage caused by solidification and cooling of the metal to be cast. be.
［従来の技術］
クラウン、ブリッジ、インレイなどの歯科用金属は、一
般に印象採取した模型によって成形したワックス型を埋
没材に埋没した後、加熱し、ワックス型の溶出で形成さ
れた埋没材中の空所に溶融金属を注入し、鋳造成形され
る。その材質は、金合金、パラジウム合金、銀合金、Ｎ
ｉ−Ｃｒ合金、Ｃｏ−Ｃｒ合金などである。[Prior Art] Dental metals such as crowns, bridges, and inlays are generally made by immersing a wax mold formed from an impression model into the investment material and then heating it to dissolve the wax mold into the investment material. Molten metal is injected into the void and cast. The materials are gold alloy, palladium alloy, silver alloy, N
These include i-Cr alloy, Co-Cr alloy, etc.
歯科鋳造用の金属は、凝固と冷却によって約１４〜２．
３％の熱収縮を生じる。そこで、埋没材の空所はあらか
じめ金属の収縮を補償するように膨張させておく必要が
ある。この補償は主に、埋没材の硬化時の凝固膨張と加
熱時の熱膨弓長とで行われる。Metals for dental castings are solidified and cooled to about 14-2.
3% heat shrinkage occurs. Therefore, it is necessary to expand the void space in the investment material in advance to compensate for the contraction of the metal. This compensation is mainly performed by the solidification expansion during hardening of the investment material and the thermal expansion bow length during heating.
歯科鋳造用埋没材の一般的な耐火材として、石英系、ク
リストバライト系などが知られている。結合剤としては
りん酸塩、エチルシリケートおよび半水石膏などが使用
される。例えば特開昭６１−２０５４７号、特開昭６２
−２１２２５４号に見られるとおりである。Quartz-based and cristobalite-based materials are known as general fireproof materials for dental casting investment materials. Phosphate, ethyl silicate, gypsum hemihydrate, etc. are used as binders. For example, JP-A-61-20547, JP-A-62
As seen in No.-212254.
［発明が解決しようとする課題］
従来の石英系またはクリストバライト系の埋没材の組成
は、一般に耐火材が約７０ｗｔ％、結合材が約３０ｗｔ
％よりなる。充填時にはさらに、これに水分を外掛けで
３０〜３５ｗｔ％程度添加する。[Problems to be Solved by the Invention] The composition of conventional quartz-based or cristobalite-based investment materials is generally about 70 wt% of fireproof material and about 30 wt% of binder.
It consists of %. At the time of filling, approximately 30 to 35 wt% of water is added to the mixture.
結合剤としての例えばα半水石膏は、吸水硬化時の凝固
膨張率が約０．３〜０．７％である。For example, alpha hemihydrate gypsum as a binder has a solidification expansion coefficient of about 0.3 to 0.7% upon hardening by water absorption.
方、石英またはクリストバライトのシルカ系耐火材の加
熱時の熱膨張率は約１，３〜１．６％である。この凝固
膨張率と熱膨張率との和である約１．６〜２．３％の膨
張率によって鋳造金属の硬化収縮率約１．３〜２．３％
を補償している。On the other hand, the coefficient of thermal expansion of a silica-based refractory material such as quartz or cristobalite when heated is about 1.3 to 1.6%. Due to the expansion coefficient of approximately 1.6 to 2.3%, which is the sum of the solidification expansion coefficient and thermal expansion coefficient, the hardening shrinkage of the cast metal is approximately 1.3 to 2.3%.
are compensated for.
最近、歯科用金属の多様化が著しく、この各金属の収縮
を補償する膨張率を備えた埋没材が切望されている。そ
こで、石英系またはクリストバライト系の埋没材におい
て、膨張率を制御する材質が提案されている。例えば、
特開昭５９−９２１４４号は分散液としてコロイダルシ
リカ、特開昭６１−１９３７４１号は食塩、特開昭６０
−１６６１４０号では溶融カルシウムまたはカルシアク
リンカ−をそれぞれ添加している。Recently, there has been a remarkable diversification of dental metals, and there is a strong need for investment materials having an expansion coefficient that compensates for the shrinkage of each metal. Therefore, materials that control the expansion coefficient have been proposed for quartz-based or cristobalite-based investment materials. for example,
JP-A No. 59-92144 uses colloidal silica as a dispersion, JP-A No. 61-193741 uses salt, and JP-A No. 61-1937 uses salt.
In No. 166140, molten calcium or calcia clinker is added.
しかし、上記従来の膨張率制御材質は膨張率の変化が直
線的でなく、金属の収縮を補償するための膨張率を金属
の種類に合わせて正確に制御することは困難であった。However, the above-mentioned conventional expansion rate control materials do not have a linear change in expansion rate, and it is difficult to accurately control the expansion rate to compensate for the contraction of the metal in accordance with the type of metal.
本発明は最近の歯科用金属の多様化に対応させるため、
膨張率を正確かつ容易に制御できる埋没材を提供するこ
とを目的としている。In order to respond to the recent diversification of dental metals, the present invention
The purpose is to provide an investment material whose expansion rate can be controlled accurately and easily.
［課題を解決するための手段］
第１の本発明は、溶融シリカ１〜１３．５ｗｔ％、残部
がクリストバライトを主材として耐火材および結合剤か
らなる歯科鋳造用埋没材である。[Means for Solving the Problems] The first aspect of the present invention is a dental casting investment material consisting of 1 to 13.5 wt% fused silica, the balance being cristobalite as a main material, a refractory material, and a binder.
第２の発明は、溶融シリカ１〜８．５ ｗｔ％、残部が
石英を主材とした耐火材および結合剤からなる歯科鋳造
用埋没材である。The second invention is a dental casting investment material consisting of a refractory material mainly containing 1 to 8.5 wt% of fused silica and the remainder being quartz, and a binder.
以下、本発明の埋没材の組成について、さらに詳しく説
明する。Hereinafter, the composition of the investment material of the present invention will be explained in more detail.
溶融シリカは、高純度のけい石を溶融して製造される。Fused silica is produced by melting high-purity silica.
この溶融シリカは膨張率が２０〜１０００℃の範囲内に
おいて約０．５％と非常に小さく、しかも熱膨張曲線が
ほぼ直線的である。本発明では溶融シリカがもつこの性
質を利用し、埋没材の膨張率を制御させたものである。This fused silica has a very small expansion coefficient of about 0.5% in the range of 20 to 1000°C, and has a nearly linear thermal expansion curve. The present invention utilizes this property of fused silica to control the expansion rate of the investment material.
後述の実施例の結果を示したグラフのとおり、クリスト
バライト系および石英系の埋没材において、耐火材の一
部を溶融シリカが置換したものは、従来の例えばコロイ
ダルシリカ、食塩、溶融カルシウムまたはカルシアクリ
ンカ−などを添加したものと異なり、その割合に対する
熱膨張率の変化が直線的であり、埋没材の膨張率を正確
に制御することが可能となる。As shown in the graph showing the results of the examples described below, cristobalite-based and quartz-based investment materials in which part of the refractory material is replaced with fused silica are different from conventional ones such as colloidal silica, common salt, molten calcium, or calcia clinker. Unlike the case where - or the like is added, the coefficient of thermal expansion changes linearly with respect to the ratio, making it possible to accurately control the coefficient of expansion of the investment material.
熱膨張率は溶融シリカの割合の増加に比例して小さくな
る。埋没材の熱膨張率は少なくとも１．２％以上でない
と実用的でないため、クリストバライト系の埋没材では
耐火材中の溶融シリカの割合を１３．５ｗｔ％以下、石
英系の埋没材ではδ、５ ｗｔ％以下とする。溶融シリ
カの割合の下限は、クリストバライト系、石英系のいず
れの埋没材においても１ｗｔ％以上とする。１ｗｔ％未
満では溶融シリカがもつ熱膨張率制御の効果がない。The coefficient of thermal expansion decreases in proportion to the increase in the proportion of fused silica. Since it is not practical unless the thermal expansion coefficient of the investment material is at least 1.2%, the proportion of fused silica in the refractory material should be 13.5 wt% or less for cristobalite-based investment materials, and δ, 5 for quartz-based investment materials. It should be less than wt%. The lower limit of the proportion of fused silica is 1 wt% or more in both cristobalite-based and quartz-based investment materials. If it is less than 1 wt%, there is no effect of controlling the coefficient of thermal expansion that fused silica has.
歯科金属の収縮率は一般的には約１．９％であるが、金
属の材質によって約１．４〜２．３％変化する。溶融シ
リカの割合を本発明で限定した範囲内で調整し、各金属
の収縮に合わせて埋没材の熱膨張を制御させる。The shrinkage rate of dental metal is generally about 1.9%, but it varies by about 1.4 to 2.3% depending on the material of the metal. The proportion of fused silica is adjusted within the range defined by the present invention, and the thermal expansion of the investment material is controlled in accordance with the contraction of each metal.
耐火材において、溶融シリカの残部を第１の発明ではク
リストバライトを主材にする。溶融シリカの残部を第２
の発明では石英を主材にする。本発明の効果を阻害しな
い範囲であれば、これにマグネシア、アルミナ、ジルコ
ニアなどの耐火材を組み合わすことができる。また、第
１の発明においてクリストバライトの一部を石英に、第
２の発明では石英の一部をクリスバライトにそれぞれ置
換することもできる。In the refractory material, the balance of fused silica is mainly made of cristobalite. The remainder of the fused silica is added to the second
The invention uses quartz as the main material. A refractory material such as magnesia, alumina, or zirconia may be combined with this material as long as it does not impede the effects of the present invention. Further, in the first invention, part of the cristobalite can be replaced with quartz, and in the second invention, part of the quartz can be replaced with cristobalite.
耐火材の粒度は、ＪＩＳ Ｔ−６６０１ニよッテ７４ｐ
ｍが８５ｗｔ％以上、１４９μｍが９５ｗｔ％以上、５
００μｍは １００ｗｔ％通過することが規定されてい
る。The particle size of the refractory material is JIS T-6601 Niyotte 74p.
m is 85 wt% or more, 149 μm is 95 wt% or more, 5
It is specified that 100 wt % of 00 μm passes through.
本発明は、この規定に基づいた粒度構成にすることがで
きる。The present invention can have a particle size configuration based on this regulation.
結合材の材質は限定されるものではなく、石膏のほか、
りん酸塩、コロイダルシリカ、エチルシリケートなどが
使用できる。The material of the binding material is not limited, and in addition to plaster,
Phosphate, colloidal silica, ethyl silicate, etc. can be used.
以上の他にも、界面活性剤、湿潤剤、着色剤、軽量化材
、硬化促進剤、硬化遅延剤および還元剤などの副次成分
を添加してもよいことは、従来材質と同様である。In addition to the above, subcomponents such as surfactants, wetting agents, coloring agents, weight reducing agents, curing accelerators, curing retarders, and reducing agents may be added, as with conventional materials. .
［実 施 例］ 以下に本発明の実施例を比較例と共に示す。[Example] Examples of the present invention are shown below along with comparative examples.
各側の熱膨張率は、何れもＪＩＳ Ｔ−８６０１に準じ
て粒度を調整した埋没材に水分を外掛けで３０ｗｔ％添
加して練和した後、内径１０ｍｍ高さ５０ｍａ＋の円筒
形型枠に充填して作成した円柱形の試験片をもって測定
した。測定温度は７００℃とした。The coefficient of thermal expansion on each side is determined by adding 30 wt% of moisture to the investment material whose particle size was adjusted according to JIS T-8601 and kneading it. Measurements were made using a cylindrical test piece prepared by filling. The measurement temperature was 700°C.
実施例１
耐火材がクリスバライト系の埋没材について、第１表の
とおり耐火材の一部を溶融シリカで置換し、その置換の
割合と埋没材の熱膨張率を測定し、その結果を第１図の
グラフに示した。Example 1 For an investment material whose refractory material is cristalite, a part of the refractory material was replaced with fused silica as shown in Table 1, and the replacement ratio and coefficient of thermal expansion of the investment material were measured, and the results were reported in Table 1. This is shown in the graph of Figure 1.
実施例２
耐火材が石英系の埋没材について、第２表のとおり耐火
材の一部を第２表のとおり溶融シリカで置換し、その置
換の割合と埋没材の熱膨張率を測定し、その結果を′ｓ
２図のグラフに示した。Example 2 For an investment material whose refractory material is quartz-based, part of the refractory material was replaced with fused silica as shown in Table 2, and the replacement ratio and the coefficient of thermal expansion of the investment material were measured, The result is
This is shown in the graph of Figure 2.
［効 果］
第１．２図のグラフのとおり、耐火材がクリストバライ
ト系および石英系の埋没材において、耐火材に対する溶
融シリカの割合と埋没材の熱膨張率とが正確に比例して
いる。したがって、溶融シリカの割合を調整することで
、鋳造金属の収縮を補償するための熱膨張を正確、かつ
容易に制御することが可能となる。[Effects] As shown in the graph in Figure 1.2, in investment materials whose refractory materials are cristobalite-based and quartz-based, the ratio of fused silica to the refractory material and the coefficient of thermal expansion of the investment material are accurately proportional. Therefore, by adjusting the proportion of fused silica, it is possible to precisely and easily control the thermal expansion to compensate for shrinkage of the cast metal.
最近の歯科用金属の多様化は著しく、各金属材質の収縮
を正確かつ容易に補償する埋没材として、本発明の効果
はきわめて大きい。Dental metals have become increasingly diverse in recent years, and the present invention is extremely effective as an investment material that accurately and easily compensates for the shrinkage of each metal material.
第１図は本発明実施例１および比較例の埋没材の溶融シ
リカの割合と熱膨張率の関係を示す図である。
第２図は本発明実施例２および比較例の埋没材の溶融シ
リカの割合と熱膨張率の関係を示す図である。
他４名
第１図
熱膨張率（クリストバライト系埋設材）溶融ノリ力の割
合（ｗｔ％）
＋３１４ １５
溶融ノリ力の割合（ｗｔ％）FIG. 1 is a diagram showing the relationship between the proportion of fused silica and the coefficient of thermal expansion of the investment materials of Example 1 and Comparative Example of the present invention. FIG. 2 is a diagram showing the relationship between the proportion of fused silica and the coefficient of thermal expansion of the investment materials of Example 2 of the present invention and Comparative Example. Other 4 people Figure 1 Coefficient of thermal expansion (cristobalite buried material) Ratio of melting glue force (wt%) +314 15 Ratio of melting glue force (wt%)
Claims (1)
ライトを主材とした耐火材および結合剤からなる歯科鋳
造用埋没材。 ２ 溶融シリカ１〜６．５ｗｔ％、残部が石英を主材と
した耐火材および結合剤からなる歯科鋳造用埋没材。[Scope of Claims] 1. An investment material for dental casting comprising 1 to 13.5 wt% of fused silica, the balance being cristobalite as the main material, and a refractory material and a binder. 2. An investment material for dental casting consisting of 1 to 6.5 wt% of fused silica, the balance being quartz as the main material, and a refractory material and a binder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2141889A JPH0437435A (en) | 1990-05-31 | 1990-05-31 | Investment for dentistry casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2141889A JPH0437435A (en) | 1990-05-31 | 1990-05-31 | Investment for dentistry casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0437435A true JPH0437435A (en) | 1992-02-07 |
Family
ID=15302523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2141889A Pending JPH0437435A (en) | 1990-05-31 | 1990-05-31 | Investment for dentistry casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0437435A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013161643A1 (en) * | 2012-04-27 | 2013-10-31 | 吉野石膏株式会社 | Gypsum-based embedding material composition for casting |
| KR20150018888A (en) * | 2012-06-18 | 2015-02-24 | 요시노 셋고 가부시키가이샤 | Casting investment composition and casting process using same |
-
1990
- 1990-05-31 JP JP2141889A patent/JPH0437435A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013161643A1 (en) * | 2012-04-27 | 2013-10-31 | 吉野石膏株式会社 | Gypsum-based embedding material composition for casting |
| CN104245184A (en) * | 2012-04-27 | 2014-12-24 | 吉野石膏株式会社 | Gypsum-based embedding material composition for casting |
| JPWO2013161643A1 (en) * | 2012-04-27 | 2015-12-24 | 吉野石膏株式会社 | Investment composition for gypsum casting |
| TWI594822B (en) * | 2012-04-27 | 2017-08-11 | Yoshino Gypsum Co | Gypsum Casting envelope material composition |
| US9834480B2 (en) | 2012-04-27 | 2017-12-05 | Yoshino Gypsum Co., Ltd. | Gypsum-based embedding material composition for casting |
| KR20150018888A (en) * | 2012-06-18 | 2015-02-24 | 요시노 셋고 가부시키가이샤 | Casting investment composition and casting process using same |
| CN104395013A (en) * | 2012-06-18 | 2015-03-04 | 吉野石膏株式会社 | Casting investment composition and casting process using same |
| CN104395013B (en) * | 2012-06-18 | 2016-05-04 | 吉野石膏株式会社 | Casting is used embedded material composition and is used the casting method of its mo(u)lding |
| US9718121B2 (en) | 2012-06-18 | 2017-08-01 | Yoshino Gypsum Co., Ltd. | Casting investment composition and casting process using same |
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