JPS63248739A - Crystallized glass for dental material - Google Patents
Crystallized glass for dental materialInfo
- Publication number
- JPS63248739A JPS63248739A JP62081248A JP8124887A JPS63248739A JP S63248739 A JPS63248739 A JP S63248739A JP 62081248 A JP62081248 A JP 62081248A JP 8124887 A JP8124887 A JP 8124887A JP S63248739 A JPS63248739 A JP S63248739A
- Authority
- JP
- Japan
- Prior art keywords
- crystallized glass
- glass
- oxide
- terms
- mgo
- 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
- 239000011521 glass Substances 0.000 title claims abstract description 42
- 239000005548 dental material Substances 0.000 title claims abstract description 13
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 15
- 239000000395 magnesium oxide Substances 0.000 claims description 10
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052684 Cerium Inorganic materials 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 229910052746 lanthanum Inorganic materials 0.000 claims description 2
- 229910001392 phosphorus oxide Inorganic materials 0.000 claims 2
- VSAISIQCTGDGPU-UHFFFAOYSA-N tetraphosphorus hexaoxide Chemical compound O1P(O2)OP3OP1OP2O3 VSAISIQCTGDGPU-UHFFFAOYSA-N 0.000 claims 2
- 239000002994 raw material Substances 0.000 abstract description 11
- 239000000203 mixture Substances 0.000 abstract description 9
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 5
- 235000011007 phosphoric acid Nutrition 0.000 abstract description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052749 magnesium Inorganic materials 0.000 abstract description 3
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 3
- 229910052697 platinum Inorganic materials 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 229910019142 PO4 Inorganic materials 0.000 abstract 1
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- 235000021317 phosphate Nutrition 0.000 abstract 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 abstract 1
- 239000000126 substance Substances 0.000 description 10
- 238000002425 crystallisation Methods 0.000 description 6
- 230000008025 crystallization Effects 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 4
- 150000004679 hydroxides Chemical class 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- -1 orthophosphoric acid Chemical class 0.000 description 3
- 150000003016 phosphoric acids Chemical class 0.000 description 3
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000001506 calcium phosphate Substances 0.000 description 2
- 229910000389 calcium phosphate Inorganic materials 0.000 description 2
- 235000011010 calcium phosphates Nutrition 0.000 description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- 150000004820 halides Chemical class 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 description 2
- 239000004137 magnesium phosphate Substances 0.000 description 2
- 229910000157 magnesium phosphate Inorganic materials 0.000 description 2
- 229960002261 magnesium phosphate Drugs 0.000 description 2
- 235000010994 magnesium phosphates Nutrition 0.000 description 2
- 150000002823 nitrates Chemical class 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000001993 wax Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 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
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004455 differential thermal analysis Methods 0.000 description 1
- MHJAJDCZWVHCPF-UHFFFAOYSA-L dimagnesium phosphate Chemical compound [Mg+2].OP([O-])([O-])=O MHJAJDCZWVHCPF-UHFFFAOYSA-L 0.000 description 1
- 229910000395 dimagnesium phosphate Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002241 glass-ceramic Substances 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- UEGPKNKPLBYCNK-UHFFFAOYSA-L magnesium acetate Chemical compound [Mg+2].CC([O-])=O.CC([O-])=O UEGPKNKPLBYCNK-UHFFFAOYSA-L 0.000 description 1
- 239000011654 magnesium acetate Substances 0.000 description 1
- 235000011285 magnesium acetate Nutrition 0.000 description 1
- 229940069446 magnesium acetate Drugs 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 150000002681 magnesium compounds Chemical class 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- UHNWOJJPXCYKCG-UHFFFAOYSA-L magnesium oxalate Chemical compound [Mg+2].[O-]C(=O)C([O-])=O UHNWOJJPXCYKCG-UHFFFAOYSA-L 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000006060 molten glass Substances 0.000 description 1
- 210000000214 mouth Anatomy 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 150000003018 phosphorus compounds Chemical class 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、歯科材料用結晶化ガラスに関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to crystallized glass for dental materials.
［従来の技術］
従来、リン酸カルシウム系結晶化ガラスからなる歯科材
料は知られている。[Prior Art] Dental materials made of calcium phosphate-based crystallized glass have been known.
歯科材料は、口腔中で長期間の使用に耐えるだけの機械
的強度と化学的耐久性を持つと同時に、外観的に天然歯
に酷似した高い透明感を持たなければならない。リン酸
カルシウムの二成分だけでは、特に耐久性に問題がある
ため、さらにＡＩＪｓなどを添加する試みがなされてい
る。Dental materials must have sufficient mechanical strength and chemical durability to withstand long-term use in the oral cavity, and at the same time, must have a high degree of transparency that closely resembles natural teeth in appearance. Since using only two components of calcium phosphate has problems in durability, attempts have been made to further add AIJs and the like.
［発明の解決しようとする問題点〕
しかしながら、リレ酸カルシウム系では、化学的耐久性
の高い結晶化ガラスが得られる組成では、結晶化ガラス
の強度が低く、外観が不透明になり、逆に強度が高く透
明感が高い結晶化ガラスが得られる組成では、化学的耐
久性が低（なる傾向があった。そのため歯科材料に要求
される条件を全部同時に満足させる組成は、きわめて限
られており、安定した物性の結晶化ガラスを得るには、
複雑な組成が要求された。[Problems to be Solved by the Invention] However, in the case of calcium lyleate-based compositions, the strength of the crystallized glass is low, the appearance becomes opaque, and the strength is low. Compositions that yield crystallized glass with high transparency and high transparency tend to have low chemical durability.Therefore, compositions that simultaneously satisfy all of the conditions required for dental materials are extremely limited. To obtain crystallized glass with stable physical properties,
A complex composition was required.
［問題点を解決するための手段］
本発明者は、機械的強度と耐久性に優れ、かつ歯科材料
として応用した時に充分な審美性を有する透明感の高い
結晶化ガラスを得ることを目的として種々研究、検討し
た結果、特定の組成を有するリン酸マグネシウム系ガラ
スを結晶化することにより前記目的を達成し得ることを
見出した。[Means for Solving the Problems] The present inventor aimed to obtain a highly transparent crystallized glass that has excellent mechanical strength and durability, and has sufficient aesthetics when applied as a dental material. As a result of various studies and examinations, it has been found that the above object can be achieved by crystallizing a magnesium phosphate glass having a specific composition.
かくして本発明はリンの酸化物なＰ、０．換算て４５〜
７０モル％およびマグネシウムの酸化物なＭｇＯ換算で
３０〜５５モル％からなる歯科材料用結晶化ガラスを提
供するにある。Thus, the present invention provides an oxide of phosphorus, P, 0. Converted to 45~
The object of the present invention is to provide a crystallized glass for dental materials comprising 70 mol % and 30 to 55 mol % of MgO, which is an oxide of magnesium.
本発明のＰ２Ｏ６の使用量は、４５〜７０モル％とする
必要がある。Ｐ２Ｏ５の使用量が４５モル％未満の場合
は、結晶化した時、結晶粒子間に微少なりラックが発生
して機械的強度が低くしかも透明性の低い結晶化ガラス
となり、逆にＰ２Ｏ，の使用量が７０モル％を超える場
合は、化学的耐久性の低い結晶化ガラスとなるため何れ
も不適当である。そしてこれら範囲のうち、Ｐ２Ｏ，が
５０〜６０モル％を採用する場合には、機械的強度、透
明性、化学的耐久性が共に最も効果的に向上し得るので
特に好ましい。The amount of P2O6 used in the present invention needs to be 45 to 70 mol%. If the amount of P2O5 used is less than 45 mol%, when crystallized, slight racks will occur between the crystal particles, resulting in a crystallized glass with low mechanical strength and low transparency, and conversely, the use of P2O, If the amount exceeds 70 mol%, the resulting crystallized glass will have low chemical durability, which is unsuitable. Among these ranges, it is particularly preferable to employ 50 to 60 mol% of P2O, since mechanical strength, transparency, and chemical durability can all be improved most effectively.
又、ＭｇＯの使用量は、３０〜５５−Ｅル％とする必要
がある。ＭｇＯの使用量が３０モル％未満の場合は、化
学的耐久性の低い結晶化ガラスとなり。Further, the amount of MgO used needs to be 30 to 55-Ele%. If the amount of MgO used is less than 30 mol%, the glass ceramic will have low chemical durability.
逆にＭｇＯの使用量が５５モル％を超える場合は、結晶
化した時、結晶粒子間に微少なりラックが発生して機械
的強度が低くしかも透明性の低い結晶化ガラスとなるの
で何れも不適当である。On the other hand, if the amount of MgO used exceeds 55 mol%, when crystallized, minute racks will be generated between the crystal particles, resulting in a crystallized glass with low mechanical strength and low transparency, which is undesirable. Appropriate.
そしてこれら範囲のうち、ＭｇＯが４０〜５０モル％を
採用する場合には、機械的強度、透明性、化学的耐久性
が共に最も効果的に向トし得るので特に好ましい。Among these ranges, it is particularly preferable to use MgO in an amount of 40 to 50 mol %, since mechanical strength, transparency, and chemical durability can all be most effectively achieved.
本発明の結晶化ガラスの製造に際し、用いられる原料と
しては次の物質が挙げられる。In producing the crystallized glass of the present invention, the following substances may be mentioned as raw materials used.
リン原料としては、例えば正リン酸等のリン酸類、ある
いはこれらリン酸類のアンモニウム塩等が用いられる。As the phosphorus raw material, for example, phosphoric acids such as orthophosphoric acid, or ammonium salts of these phosphoric acids are used.
また、リン酸マグネシウム、リン酸水素マグネシウム等
のリン酸類のマグネシウム塩も単独あるいは他のマグネ
シウム化合物やリン化合物と混合して用いることができ
る。Further, magnesium salts of phosphoric acids such as magnesium phosphate and magnesium hydrogen phosphate can also be used alone or in combination with other magnesium compounds or phosphorus compounds.
マグネシウム原料としては例えば酸化マグネシウム、炭
酸マグネシウムが代表的であるが、その池水酸イヒマグ
ネシウム、酢酸マグネシウム、シュウ酸マグネシウム等
の無機塩や有機塩を適宜用い得る。Typical magnesium raw materials include magnesium oxide and magnesium carbonate, but inorganic salts and organic salts thereof such as magnesium hydroxide, magnesium acetate, and magnesium oxalate may be used as appropriate.
本発明の結晶化ガラスの製造手段としては、例えば、諸
原料を所定量秤量して混合し、これを２００〜９００℃
で ｌＮ１０Ｎ１０時間酸せしめてガラス原料を用意す
る。As a means for producing the crystallized glass of the present invention, for example, various raw materials are weighed and mixed in a predetermined amount, and the mixture is heated at 200 to 900°C.
A raw material for glass is prepared by acidifying it for 10 hours at 1N10N.
次いでこのガラス原料を白金るつぼ中で９００〜１５０
０℃にて ５分〜ＩＯ時間加熱溶融し、均質にガラス化
する。Next, this glass raw material was heated to 900-150% in a platinum crucible.
Heat and melt at 0°C for 5 minutes to IO hours to homogeneously vitrify.
歯科材料を臨床的に応用するにあたっては、機械的強度
、耐久性、外観だけでなく、成形性の良さが重要である
。本発明の結晶化ガラスは、歯科用金属で使用されてい
るロストワックス法による精密鋳造技術を応用した成形
が可能である。すなわち、パラフィンワックス等で造っ
た型を、埋没材に埋め込み、その後ワックスを焼却除去
しその結果できた鋳型に、溶融したガラスを流し込んで
まず所望の形状のガラスを得る。その後、ガラスを５０
０〜９００℃で５分〜１００時間熱処理することにより
結晶化を行う。この処理は、ガラスを鋳型から取り出し
てから行うこともできるし、鋳型の中で行うこともでき
る。鋳型の中で行ったほうが寸法変化や変形が少なくな
るので好ましい。鋳型から取り出してから結晶化処理を
行う場合は、透明なガラス状態で鋳造欠陥の有無の確認
や、形状の修正を行った後に結晶化し得る利点がある。When applying dental materials clinically, not only mechanical strength, durability, and appearance but also good moldability are important. The crystallized glass of the present invention can be molded by applying precision casting technology using the lost wax method used for dental metals. That is, a mold made of paraffin wax or the like is embedded in an investment material, the wax is then incinerated and removed, and molten glass is poured into the resulting mold to obtain glass in a desired shape. Then add 50 glasses
Crystallization is performed by heat treatment at 0 to 900°C for 5 minutes to 100 hours. This treatment can be performed after the glass is removed from the mold, or it can be performed inside the mold. It is preferable to perform this in a mold because dimensional changes and deformation are reduced. When performing crystallization treatment after removing from the mold, there is an advantage that crystallization can be performed after checking for casting defects or correcting the shape in a transparent glass state.
また結晶化の時にアルミナ粉末や、前記の埋没材のよう
な結晶化温度でガラスと反応しない物質に埋め込むこと
によって変形をおさえることができる。Further, during crystallization, deformation can be suppressed by embedding the glass in a substance that does not react with glass at the crystallization temperature, such as alumina powder or the above-mentioned investment material.
更に、本発明においては％Ａｌ、 Ｃｅ、 Ｌａの酸化
物のうち少なくとも１種を、それぞれＡＩＪｉ。Furthermore, in the present invention, at least one of the oxides of Al, Ce, and La is used as AIJi, respectively.
Ｃｅｎｔｓ、 ＬａＪｓに換算して １〜１５モル％添
加することにより一層、化学的耐久性の向上、結晶化の
均質化１機械的強度の向上、透明感の向上をはかること
ができる。By adding 1 to 15 mol% in terms of Cents and LaJs, it is possible to further improve chemical durability, homogenize crystallization, improve mechanical strength, and improve transparency.
上記酸化物が１モル％に満たない場合は、添加剤の効果
が発現されず、逆に１５モル％を超える場合は、結晶化
ガラスの強度がかえって低下してしまう虞れがあるので
何れも好ましくない。If the content of the above oxide is less than 1 mol%, the effect of the additive will not be expressed, and if it exceeds 15 mol%, the strength of the crystallized glass may actually decrease. Undesirable.
Ａ１． Ｃｅｐ Ｌａの原料としては、酸化物の他に、
水酸化物や硫酸塩等の酸化物になり得る化合物も使用で
きる。A1. In addition to oxides, the raw materials for Cep La include:
Compounds that can form oxides such as hydroxides and sulfates can also be used.
更に、本発明においては、 Ｌｉ、 Ｎａ、 Ｋの酸化
物の１種あるいは混合物をＬｉｚ口、 Ｎａｇ口、に、
０に換算して０．０１〜１５モル％添加することができ
る。これにより、結晶化ガラスの機械的強度が向１−す
る。Furthermore, in the present invention, one type or a mixture of oxides of Li, Na, and K is added to the Liz port and the Nag port,
It can be added in an amount of 0.01 to 15 mol% in terms of 0. This improves the mechanical strength of the crystallized glass.
上記酸化物が０．旧モル％に満たない場合は、添加剤の
効果が発現されず、逆に１５モル％を超える場合は、結
晶化ガラスの耐水性が低下してしまう虞れがあるので好
ましくない。The above oxide is 0. If the content is less than 15% by mole, the effect of the additive will not be exhibited, and if it exceeds 15% by mole, the water resistance of the crystallized glass may deteriorate, which is not preferable.
Ｌｉ、 Ｎａ、 Ｋの原料としては、例えば単体、酸化
物、水酸化物、炭酸塩、硝酸塩、硫酸塩、ハロゲン化物
および有機酸塩等を用いることができる。As raw materials for Li, Na, and K, for example, simple substances, oxides, hydroxides, carbonates, nitrates, sulfates, halides, and organic acid salts can be used.
更に本発明においては、Ｎｉ、 Ｆｅ、 Ｒｈ、 Ｒｕ
、 Ｐｄの金属Ｑｊ体もしくは化合物から選ばれた一種
以」ユを金属元素に換算して合計０．００１〜１．０モ
ル％添加することによって結晶化ガラスを一層、天然歯
に酷似した色調にすることができる。これらの化合物と
しては酸化物およびガラス溶融時に酸化物になりつる化
合物、例えば水酸化物、硫化物、ハロゲン化物、炭酸塩
、硫酸塩、硝酸塩および有機酸塩等を使用することがで
きる。Furthermore, in the present invention, Ni, Fe, Rh, Ru
By adding a total of 0.001 to 1.0 mol% of one selected from the metal Qj form or compound of Pd in terms of metal element, the crystallized glass can be made to have a color tone that closely resembles that of natural teeth. can do. As these compounds, oxides and compounds that turn into oxides when glass is melted, such as hydroxides, sulfides, halides, carbonates, sulfates, nitrates, and organic acid salts, can be used.
［実施例］
実施例１〜ｌＯ
ガラス生成時に第１表の組成になるように、原料を計４
００ｇ秤量しよく混合した。これを、４００℃で５時間
焼成して、乾燥させた後白金るつぼに入れ１３００℃で
２時間溶融した。その後。[Example] Examples 1 to 1O A total of 4 raw materials were added so that the composition shown in Table 1 was obtained during glass production.
00g was weighed and mixed thoroughly. This was fired at 400°C for 5 hours, dried, and then placed in a platinum crucible and melted at 1300°C for 2 hours. after that.
ステンレス板１−に、融液を流し出してガラスを得た。Glass was obtained by pouring the melt onto a stainless steel plate 1-.
このガラスについて、示差熱分析を行いガラス転移点を
測定した。次にガラスを再溶融し通常の歯科用金属鋳造
法と同様な方法で２ｍｍφ×２５ｍｍの円柱状に成形し
た。その後鋳型中でガラス転移点より １５０℃高い温
度で２０時間熱処理を行い結晶化した。この結晶化ガラ
スを５本ずつ用いて、初期の曲げ強度と、８０℃のイオ
ン交換水に ３日間浸漬した後の曲げ強度を測定した結
果を外観とともに表１に示した。This glass was subjected to differential thermal analysis to measure the glass transition point. Next, the glass was remelted and molded into a cylindrical shape of 2 mmφ x 25 mm using a method similar to a normal dental metal casting method. Thereafter, heat treatment was performed in a mold at a temperature 150°C higher than the glass transition point for 20 hours to crystallize. Five crystallized glasses were used to measure the initial bending strength and the bending strength after being immersed in 80°C ion-exchanged water for 3 days. The results are shown in Table 1 along with the appearance.
第 １ 表Table 1
Claims (2)
ル％およびマグネシウムの酸化物をＭｇＯ換算で３０〜
５５モル％含有する歯科材料用結晶化ガラス。(1) Phosphorus oxide is 45 to 70 mol% in terms of P_2O_6 and magnesium oxide is 30 to 70 mol% in terms of MgO
Crystallized glass for dental materials containing 55 mol%.
ル％、マグネシウムの酸化物をＭｇＯ換算で１５〜５４
モル％およびＡｌ、Ｃｅ、Ｌａの酸化物のうち少なくと
も１種を、それぞれＡｌ＿２Ｏ＿３、Ｃｅ＿２Ｏ＿３、
Ｌａ＿２Ｏ＿３に換算して１〜１５モル％含有する歯科
材料用結晶化ガラス。(2) Phosphorus oxide is 45 to 70 mol% in terms of P_2O_6, magnesium oxide is 15 to 54 in terms of MgO
mol% and at least one of the oxides of Al, Ce, and La, Al_2O_3, Ce_2O_3,
Crystallized glass for dental materials containing 1 to 15 mol% in terms of La_2O_3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62081248A JPS63248739A (en) | 1987-04-03 | 1987-04-03 | Crystallized glass for dental material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62081248A JPS63248739A (en) | 1987-04-03 | 1987-04-03 | Crystallized glass for dental material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63248739A true JPS63248739A (en) | 1988-10-17 |
Family
ID=13741093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62081248A Pending JPS63248739A (en) | 1987-04-03 | 1987-04-03 | Crystallized glass for dental material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63248739A (en) |
-
1987
- 1987-04-03 JP JP62081248A patent/JPS63248739A/en active Pending
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