JPH04126141A - Artificial crown - Google Patents
Artificial crownInfo
- Publication number
- JPH04126141A JPH04126141A JP2247796A JP24779690A JPH04126141A JP H04126141 A JPH04126141 A JP H04126141A JP 2247796 A JP2247796 A JP 2247796A JP 24779690 A JP24779690 A JP 24779690A JP H04126141 A JPH04126141 A JP H04126141A
- Authority
- JP
- Japan
- Prior art keywords
- crystallized glass
- glass
- core
- color tone
- artificial tooth
- 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 claims abstract description 53
- 239000001506 calcium phosphate Substances 0.000 claims abstract description 4
- 229910000389 calcium phosphate Inorganic materials 0.000 claims abstract description 4
- 235000011010 calcium phosphates Nutrition 0.000 claims abstract description 4
- 239000010445 mica Substances 0.000 claims abstract description 4
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 4
- 210000000332 tooth crown Anatomy 0.000 claims description 32
- 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 claims description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 17
- 239000002184 metal Substances 0.000 abstract description 17
- 239000000463 material Substances 0.000 abstract description 14
- 239000003479 dental cement Substances 0.000 abstract description 7
- 239000000919 ceramic Substances 0.000 abstract description 6
- 239000002131 composite material Substances 0.000 abstract description 5
- 239000013078 crystal Substances 0.000 abstract description 5
- -1 calcium phosphate compound Chemical class 0.000 abstract 1
- 150000001875 compounds Chemical class 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 238000009434 installation Methods 0.000 abstract 1
- 239000011162 core material Substances 0.000 description 29
- 210000000214 mouth Anatomy 0.000 description 11
- 238000005266 casting Methods 0.000 description 7
- 229910052573 porcelain Inorganic materials 0.000 description 5
- 239000002670 dental porcelain Substances 0.000 description 4
- 239000011888 foil Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000001993 wax Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910000510 noble metal Inorganic materials 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 229910001020 Au alloy Inorganic materials 0.000 description 2
- 229910000599 Cr alloy Inorganic materials 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910052586 apatite Inorganic materials 0.000 description 2
- 238000009750 centrifugal casting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000156 glass melt Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 description 2
- 239000011505 plaster Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- 235000010919 Copernicia prunifera Nutrition 0.000 description 1
- 244000180278 Copernicia prunifera Species 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229910001252 Pd alloy Inorganic materials 0.000 description 1
- 229910001260 Pt alloy Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 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
- 238000010276 construction Methods 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 210000004195 gingiva Anatomy 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 239000003353 gold alloy Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 210000004283 incisor Anatomy 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000000699 topical effect Effects 0.000 description 1
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 1
- 239000002672 zinc phosphate cement Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、人工歯冠に関し、より具体的には結晶化ガラ
スを使用した人工歯冠に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an artificial tooth crown, and more specifically to an artificial tooth crown using crystallized glass.
［従来技術とその問題点］
従来より一般に使用されている人工歯冠の材質としでは
、大きく分けて金属、樹脂、陶材がある。[Prior art and its problems] Materials for artificial dental crowns that have been commonly used in the past can be broadly classified into metal, resin, and porcelain.
金属としては、金合金、銀合金、金銀パラジウム合金等
の貴金属やＮ１−Ｃｒ合金、Ｃｏ−Ｃｒ合金等の非貴金
属が使用される。これらの材料は、いづれも鋳造によっ
て容易に作製することが可能であるが、色調が天然歯牙
と大幅に異なるという欠点を有している。また特に非貴
金属の場合は、口腔内で長期に亙って使用すると金属中
の有害イオンが溶出し、生体に悪影響を及ぼすことが知
られている。As the metal, noble metals such as gold alloy, silver alloy, gold-silver-palladium alloy, and non-noble metals such as N1-Cr alloy and Co-Cr alloy are used. All of these materials can be easily produced by casting, but they have the disadvantage that the color tone is significantly different from that of natural teeth. In addition, especially in the case of non-noble metals, it is known that if they are used in the oral cavity for a long period of time, harmful ions in the metals will elute and have an adverse effect on living organisms.
また樹脂としては、メチルメタクリレート系やジメタク
リレート系の高分子あるいはこれらと無機フィラーとの
複合物が使用され、これらの材料からなる人工歯冠は、
色調が天然歯牙に近似しているが、長期に亙って使用す
ると摩耗や変色が生じるなど、口腔内における耐久性が
悪いという問題がある。In addition, as the resin, methyl methacrylate-based or dimethacrylate-based polymers or composites of these and inorganic fillers are used, and artificial tooth crowns made of these materials are
Although the color tone is similar to that of natural teeth, there are problems with poor durability in the oral cavity, such as wear and discoloration when used over a long period of time.
さらに陶材からなる人工歯冠としては、全て陶材からで
きているオールポーセレン系やキャップ形状を有する金
属コアーを使用した金属・ボーセレン複合系のものが存
在する。これらの歯科用陶材からなる人工歯冠も色調が
天然歯牙に近似し、口腔内における耐久性も良好である
が、陶材粉末を築盛した後、焼結させて作製するため、
製造時における作業が煩雑であり、またその製造物も緻
密性が悪く、金属コアーを使用したとしても高い強度が
得られ難いという欠点を有している。Furthermore, as artificial tooth crowns made of porcelain, there are all-porcelain crowns made entirely of porcelain, and metal-beaucelain composite crowns that use a metal core with a cap shape. Artificial tooth crowns made of these dental porcelains also have a color tone similar to that of natural teeth and have good durability in the oral cavity, but because they are made by building up porcelain powder and then sintering it,
The manufacturing process is complicated, the product has poor density, and even if a metal core is used, it is difficult to obtain high strength.
近年上記事情に鑑み、色調が天然歯牙に近似し、長期に
亙って口腔内で安定であり、しかも生体親和性に優れた
結晶化ガラスが各種開発され、これらの結晶化ガラスを
鋳造法によって作製した人工歯冠が注目を集めている。In recent years, in view of the above circumstances, various types of crystallized glass have been developed that have a color tone similar to that of natural teeth, are stable in the oral cavity for a long period of time, and have excellent biocompatibility. The manufactured artificial tooth crowns are attracting attention.
結晶化ガラスの鋳造体からなる人工歯冠は、樹脂や歯科
用陶材からなる人工歯冠に比べて緻密性に優れているた
めに高い強度を有しているが、口腔内で長期に亙って使
用する部材としてより高い強度が要求されているのが実
情である。Artificial tooth crowns made of cast crystallized glass have greater density and strength than artificial tooth crowns made of resin or dental porcelain, but they do not remain in the oral cavity for long periods of time. The reality is that higher strength is required for the members used in the construction.
ところで元肥したように結晶化ガラスからなる人工歯冠
は、色調が天然歯牙のそれと近似しているものの、実際
の使用に当たっては他の人工歯冠と同様にその色調を被
装着者（患者）の歯色に合わせて一本一本オーダーメイ
ドで作製される。この際、患者の天然歯牙の色調は、シ
ェードガイドと呼ばれる歯科用歯色色見本を用いて歯科
医師（チェアーサイド）から技工士（ラボサイド）にそ
の色調が伝達され、歯科医師から伝達された色調に合致
するように技工士によって上薬を用いて最終的に色調が
調整される。しかし人工歯冠として使用される結晶化ガ
ラスは、通常色調が半透明であるため一旦上薬を用いて
その色調を天然歯牙のそれに近似するように整えても口
腔内に装着した際に支台や人工歯冠と支台とを接着する
ための歯科用セメントの色調が反映してしまい、その結
果人工歯冠の色調が製作時と装着時とでは異なってしま
うという問題を存している。By the way, as mentioned earlier, artificial tooth crowns made of crystallized glass have a color tone similar to that of natural teeth. Each one is custom-made to match the color of your teeth. At this time, the color tone of the patient's natural teeth is transmitted from the dentist (chair side) to the technician (lab side) using a dental tooth color sample called a shade guide. The color tone is finally adjusted by the technician using a topical medicine to match. However, the crystallized glass used as an artificial tooth crown is usually translucent in color, so even if the color tone is adjusted to approximate that of a natural tooth using an overcoat, the abutment will not hold when placed in the oral cavity. There is a problem in that the color tone of the dental cement for bonding the artificial tooth crown and the abutment is reflected, and as a result, the color tone of the artificial tooth crown differs between when it is manufactured and when it is installed.
［発明の目的コ
本発明の目的は、色調が天然歯牙に近似しており、長期
に亙って口腔内で安定であり、生体親和性に優れ、機械
的強度が高く、さらに装着時の色調が支台や歯科用セメ
ントの色調の影響を受けない人工歯冠を提供することで
ある。[Objective of the Invention] The object of the present invention is to have a color tone similar to that of natural teeth, to be stable in the oral cavity for a long period of time, to have excellent biocompatibility, high mechanical strength, and to have a color tone when worn. The purpose of the present invention is to provide an artificial tooth crown that is not affected by the color tone of the abutment or dental cement.
［発明の構成コ
本発明の人工歯冠は、キャップ形状を有するコアーの外
表面に、結晶化ガラス層が形成されてなることを特徴と
する。[Structure of the Invention] The artificial tooth crown of the present invention is characterized in that a crystallized glass layer is formed on the outer surface of a core having a cap shape.
本発明におけるコアーは、内腔所が存在するキャップ形
状を有しており、その材料としては金属、セラミックス
、結晶化ガラス、ガラス、セラミックスとガラスとの複
合物が適している。金属、ガラスあるいは結晶化ガラス
を使用する場合は、鋳造によって作製するが、薄い金属
箔を使用する場合は、圧接によって作製する。またセラ
ミック、結晶化ガラス、ガラスあるいはガラスとセラミ
ックとの複合物を使用する場合は、それらの材料の粉末
を水やグリセリン等の液と混合し、スラリー状に練和し
た後、築盛し、焼成することによって作製することがで
きる。コアーは、人工歯冠の強度を向上させると共に支
台や歯科用セメントの色調が人工歯冠の色調に反映する
のを防止する作用を有している。その色調としては、金
属の場合は黄金色が好ましく、それ以外の材料の場合は
白色や黄色が好ましい。またその肉厚は部位によって異
なるが、金属の場合は０．０２〜０．８ｗ＋ｍ 、それ
以外の材料の場合は０．２〜Ｇ、［ｉｍｍである。肉厚
が薄くなりすぎるとコアーとしての強度が低下して高強
度の人工歯冠が得られ難くなり、一方厚くなりすぎると
結晶化ガラス層の厚みを薄くする必要があるため、ガラ
スの成形が困難となると共にコアーの色調が結晶化ガラ
ス層に反映しやすくなるために好ましくない。The core in the present invention has a cap shape with a cavity, and suitable materials for the core include metals, ceramics, crystallized glass, glass, and composites of ceramics and glass. When metal, glass, or crystallized glass is used, it is produced by casting, but when a thin metal foil is used, it is produced by pressure welding. In addition, when using ceramic, crystallized glass, glass, or a composite of glass and ceramic, the powder of those materials is mixed with a liquid such as water or glycerin, kneaded into a slurry, then piled up and fired. It can be produced by The core has the function of improving the strength of the artificial tooth crown and preventing the color tone of the abutment or dental cement from being reflected in the color tone of the artificial tooth crown. The color tone is preferably golden in the case of metal, and white or yellow in the case of other materials. The thickness varies depending on the part, but in the case of metal, it is 0.02 to 0.8 W+m, and in the case of other materials, it is 0.2 to G, [imm]. If the wall thickness becomes too thin, the strength of the core will decrease, making it difficult to obtain a high-strength artificial tooth crown.On the other hand, if the wall thickness becomes too thin, the crystallized glass layer will need to be thinned, making it difficult to form the glass. This is not preferable because it becomes difficult and the color tone of the core tends to be reflected in the crystallized glass layer.
本発明における結晶化ガラス層は、色調が天然歯牙のそ
れに近似しており、特にリン酸カルシウム系結晶化ガラ
スあるいはマイカ系結晶化ガラスを使用すると長期に亙
る口腔内での安定性や優れた生体親和性を有しているの
で好ましい。また本発明の結晶化ガラスは、ガラスを所
定形杖に成形した後、熱処理してガラス中に所望の結晶
を析出させたものであり、非常に緻密な構造を有してい
るため築盛によって作製される歯科用陶材に比べて高い
強度が得られる。The crystallized glass layer in the present invention has a color tone similar to that of natural teeth, and especially when calcium phosphate-based crystallized glass or mica-based crystallized glass is used, it has long-term stability in the oral cavity and excellent biocompatibility. It is preferable because it has the following. In addition, the crystallized glass of the present invention is obtained by forming glass into a cane of a predetermined shape and then heat-treating it to precipitate desired crystals in the glass.Since it has a very dense structure, it can be produced by building up. It has higher strength than other dental porcelain materials.
本発明の人工歯冠を作製するには、コアーを鋳型の所定
箇所に配置してからガラスを鋳造し、熱処理することに
よって作製する方法やコアーと結晶化ガラス層とを別々
に作製してから両者を接着剤を用いて接着する方法等が
ある。The artificial tooth crown of the present invention can be manufactured by placing the core in a predetermined position in a mold, casting glass, and heat-treating it, or by separately manufacturing the core and the crystallized glass layer. There is a method of bonding the two using an adhesive.
［実施例コ
以下、本発明を実施例および比較例に基づいて詳細に説
明する。[Examples] The present invention will be described in detail below based on Examples and Comparative Examples.
（実施例１）
図面は、本発明の人工歯冠ｌを口腔内の支台歯２に装着
した状態を示す説明図であり、３は結晶化ガラス層、４
は金属箔からなるコアー、５は歯科用セメント層、６は
歯肉である。(Example 1) The drawing is an explanatory diagram showing a state in which the artificial tooth crown l of the present invention is attached to an abutment tooth 2 in the oral cavity, and 3 is a crystallized glass layer, 4
5 is a core made of metal foil, 5 is a dental cement layer, and 6 is a gingiva.
図面の人工歯冠ｌは、上顎中切歯として用いられ、その
作製方法は以下のとおりである。The artificial tooth crown I shown in the drawing is used as an maxillary central incisor, and its manufacturing method is as follows.
まず石膏製作業用模型の上に約０．０５ｍ鵬の厚みにな
るようにスペーサ材、すなわち支台歯２に人工歯冠ｌを
接着した際の歯科用セメント層５となる部分を確保する
ために使用される有機質塗料を塗布し、さらにその上に
約０．０５ｍｍの厚みを有する金と白金の合金からなる
金属箔を巻き、圧接することにより、コアー４を作製し
た。その後コアー４の外表面にパラフィンやカーナバか
らなる歯科用ワックスを築盛してコアー４とワックスが
一体化した鋳造パターンを作製した。次いでこの鋳造パ
ターンにワックスからなるスプルー線を溶着した後、石
膏製作業用模型から取り外し、スプルー線を円錐台に取
り付け、その円錐台の外周縁部に鋳造用金属リングを配
置し、このリング内にシリカとリン酸塩とを混合した鋳
型材を注入した。鋳型材が硬化した後、円錐台を取り外
し、鋳型を電気炉内に入れ、室温から約９００℃まで昇
温し、ワックスとスプルー線を燃焼させてコアー４付の
鋳型を作製した。その後重量百分率で５ｉ０２５０％、
Ｐ２Ｏ５７％、Ａｌ２０３１８％、ＭｇＯ５％、Ｃａ０
１４％、Ｌ１２０３％、ＴＩｏ、 ３％の組成を有する
ガラス融液を小さなブロックに成形し、これを約１５０
０℃の温度で再溶融して該鋳型に注入し、遠心鋳造する
ことによってコアー４の外表面にガラス層を形成した。First, in order to secure a spacer material, that is, a portion that will become the dental cement layer 5 when the artificial tooth crown 1 is bonded to the abutment tooth 2, to a thickness of about 0.05 m on the plaster working model. The core 4 was prepared by applying an organic paint used in the above, and then wrapping a metal foil made of an alloy of gold and platinum having a thickness of about 0.05 mm thereon and pressing it together. Thereafter, a dental wax made of paraffin or carnauba was applied to the outer surface of the core 4 to create a casting pattern in which the core 4 and the wax were integrated. Next, after welding a sprue wire made of wax to this casting pattern, it is removed from the plaster working model, the sprue wire is attached to a truncated cone, a metal ring for casting is placed around the outer periphery of the truncated cone, and a metal ring for casting is placed on the outer periphery of the truncated cone. A molding material mixed with silica and phosphate was injected into the mold. After the mold material had hardened, the truncated cone was removed, the mold was placed in an electric furnace, and the temperature was raised from room temperature to approximately 900° C., and the wax and sprue wire were burned to produce a mold with four cores. After that, the weight percentage is 5i0250%,
P2O57%, Al20318%, MgO5%, Ca0
A glass melt with a composition of 14%, L1203%, TIo, 3% was formed into small blocks, which
A glass layer was formed on the outer surface of the core 4 by remelting it at a temperature of 0° C., injecting it into the mold, and performing centrifugal casting.
このコアー４付のガラス層を約９００℃で２時間熱処理
することによってガラス中にアパタイト結晶を析出させ
てリン酸カルシウム結晶化ガラス層３とした後、鋳型か
ら取り出し、スプルー線を切断した。The glass layer with the core 4 was heat-treated at about 900° C. for 2 hours to precipitate apatite crystals in the glass to form the calcium phosphate crystallized glass layer 3, which was then taken out from the mold and the sprue wire was cut.
こうして作製した人工歯冠ｌの破折強度を測定したとこ
ろ５５ｋｇｆであった。The fracture strength of the artificial tooth crown I produced in this way was measured and found to be 55 kgf.
（実施例２）
重量百分率でＳ１０゜８８％、８２０３１５％、Ａ１．
０゜３％、ＢａＯ３％、Ｌｌｔｏ ２％、Ｎａ２Ｏ２
％、Ｋ２Ｏ３％の組成を有するガラス粉末５０％とアル
ミナ粉末５０％からなるコアー材料を水で練和し、スラ
リー状物質とした。次いでこのスラリー状物質を実施例
１と同様のスペーサ材が塗布された耐火性作業用模型上
に焼成後の厚みが約０．５１になるように築盛し、電気
炉を用いて乾燥した後、１００℃／分で約１１００℃ま
で昇温し、該温度で３分間保持するというスケジュール
で焼成を行うことによってコアーを作製した。(Example 2) S10°88%, 820315%, A1.
0°3%, BaO3%, Llto2%, Na2O2
A core material consisting of 50% glass powder and 50% alumina powder having a composition of %, K2O and 3% was kneaded with water to form a slurry-like material. Next, this slurry-like material was piled up on a fire-resistant work model coated with a spacer material similar to that in Example 1 so that the thickness after firing was about 0.51 mm, and after drying using an electric furnace, A core was produced by firing according to a schedule in which the temperature was raised to about 1100°C at a rate of 100°C/min and held at this temperature for 3 minutes.
その後このコアーを使用して、実施例１と同様の方法で
コアー付の鋳型を作製した後、重量百分率でＳｔＯ□
５７．１％、ＭｇＯ１１，７％、Ｆ ５．９％、Ｋ２Ｏ
１３，０％、ＺｒＯ２４，８％、ＣａＯ３，１％、Ｐ２
Ｏ３２，ｌｌｉ％、ＣｅＯ，１，８％の組成を有するガ
ラス融液を小さなブロックに成形し、これを約１４００
℃の温度で再溶融して該鋳型に注入し、遠心鋳造するこ
とによってコアーの外表面にガラス層を形成した。この
コアー付のガラス層を約１０５０℃で４時間熱処理する
ことによってガラス中に四球化フルオロマイカ結晶とア
パタイト結晶を析出させてマイカ結晶化ガラスとした後
、鋳型から取り出し、スプルー線を切断した。Thereafter, using this core, a mold with a core was produced in the same manner as in Example 1, and then the weight percentage of StO□
57.1%, MgO 11.7%, F 5.9%, K2O
13.0%, ZrO24.8%, CaO3.1%, P2
A glass melt having a composition of O32,lli%, CeO,1,8% was formed into small blocks, which were
A glass layer was formed on the outer surface of the core by remelting it at a temperature of 0.degree. C. and pouring it into the mold, followed by centrifugal casting. This glass layer with a core was heat-treated at about 1050° C. for 4 hours to precipitate tetraspherical fluoromica crystals and apatite crystals in the glass to obtain mica crystallized glass, which was then taken out from the mold and the sprue wire was cut.
こうして作製した人工歯冠の破折強度を測定したところ
６２ｋｇｆであった。The fracture strength of the thus produced artificial tooth crown was measured and was found to be 62 kgf.
（比較例１）
実施例１の人工歯冠と同じ形状で、コアーを有さない結
晶化ガラスからなる人工歯冠を実施例１と同様の方法に
よって作製し、その破折強度を測定したところ３５ｋｇ
ｆであった。(Comparative Example 1) An artificial tooth crown made of crystallized glass without a core and having the same shape as the artificial tooth crown of Example 1 was prepared by the same method as Example 1, and its fracture strength was measured. 35kg
It was f.
（比較例２）
実施例１と同様の方法で金属箔からなるコアーを作製し
た後、その外表面に歯科用陶材を築盛し、適法どおり乾
燥、焼成を行った。焼成後、研削により形態を整ること
によって人工歯冠を作製し、その破折強度を測定したと
ころ３１ｋｇｆであった。(Comparative Example 2) After producing a core made of metal foil in the same manner as in Example 1, dental porcelain was built up on the outer surface of the core, and the core was dried and fired as required. After firing, an artificial tooth crown was prepared by adjusting the shape by grinding, and its fracture strength was measured and found to be 31 kgf.
尚、破折強度は、人工歯冠を金属製の支台に歯科用リン
酸亜鉛セメントで接着し、万能試験機を用いて破壊する
までの荷重を測定したものである。The fracture strength was determined by bonding the artificial tooth crown to a metal abutment with dental zinc phosphate cement and measuring the load required to break it using a universal testing machine.
荷重は、歯輪に対して４５″の角度、０．５ｍｍ ／分
の速さで切端、すなわち歯の先端に負荷した。The load was applied to the incisal end, ie, the tip of the tooth, at an angle of 45″ to the tooth ring and at a rate of 0.5 mm /min.
［発明の効果］
以上のように本発明の人工歯冠は、表面部が結晶化ガラ
スからなるため色調が天然歯牙に近似し、長期に亙って
口腔内で安定で、生体親和性に優れており、またコアー
を有するため機械的強度が高く、且つその色調が支台や
歯科用セメントの色調の影響を受けないため製作時の色
調が装着時に正確に再現される。[Effects of the Invention] As described above, the artificial tooth crown of the present invention has a color tone similar to that of a natural tooth because the surface portion is made of crystallized glass, is stable in the oral cavity for a long period of time, and has excellent biocompatibility. Moreover, since it has a core, it has high mechanical strength, and its color tone is not affected by the color tone of the abutment or dental cement, so the color tone at the time of manufacture is accurately reproduced when installed.
図面は、本発明の人工歯冠を口腔内の支台歯に装着した
状態を示す説明図である。
ｌ・・・人工歯冠
３・・・結晶化ガラス層
２・・・支台歯
４・・・コアー
特許出願人 日本電気硝子株式会社
代表者 岸 １）清 作The drawing is an explanatory diagram showing a state in which the artificial tooth crown of the present invention is attached to an abutment tooth in the oral cavity. l...Artificial tooth crown 3...Crystalline glass layer 2...Abutment tooth 4...Core patent applicant Nippon Electric Glass Co., Ltd. Representative Kishi 1) Saku Kiyoshi
Claims (2)
ガラス層が形成されてなることを特徴とする人工歯冠。(1) An artificial tooth crown, characterized in that a crystallized glass layer is formed on the outer surface of a core having a cap shape.
ラスあるいはマイカ系結晶化ガラスからなることを特徴
とする特許請求の範囲第１項記載の人工歯冠。(2) The artificial tooth crown according to claim 1, wherein the crystallized glass layer is made of calcium phosphate-based crystallized glass or mica-based crystallized glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2247796A JPH04126141A (en) | 1990-09-17 | 1990-09-17 | Artificial crown |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2247796A JPH04126141A (en) | 1990-09-17 | 1990-09-17 | Artificial crown |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04126141A true JPH04126141A (en) | 1992-04-27 |
Family
ID=17168784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2247796A Pending JPH04126141A (en) | 1990-09-17 | 1990-09-17 | Artificial crown |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04126141A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012105983A (en) * | 2010-11-15 | 2012-06-07 | Ivoclar Vivadent Ag | Oven |
-
1990
- 1990-09-17 JP JP2247796A patent/JPH04126141A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012105983A (en) * | 2010-11-15 | 2012-06-07 | Ivoclar Vivadent Ag | Oven |
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