JPH0250741B2 - - Google Patents
Info
- Publication number
- JPH0250741B2 JPH0250741B2 JP8495284A JP8495284A JPH0250741B2 JP H0250741 B2 JPH0250741 B2 JP H0250741B2 JP 8495284 A JP8495284 A JP 8495284A JP 8495284 A JP8495284 A JP 8495284A JP H0250741 B2 JPH0250741 B2 JP H0250741B2
- Authority
- JP
- Japan
- Prior art keywords
- artificial tooth
- flask
- artificial
- denture base
- teeth
- 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 - Lifetime
Links
- 229920005989 resin Polymers 0.000 claims description 14
- 239000011347 resin Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 229920005992 thermoplastic resin Polymers 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 229920002492 poly(sulfone) Polymers 0.000 description 12
- 239000004695 Polyether sulfone Substances 0.000 description 8
- 229920006393 polyether sulfone Polymers 0.000 description 8
- 239000011505 plaster Substances 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 239000001993 wax Substances 0.000 description 5
- 206010062544 Tooth fracture Diseases 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 4
- -1 polyethylene terephthalate Polymers 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 229920001230 polyarylate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 229920003278 Udel® P1700 Polymers 0.000 description 1
- 229920004695 VICTREX™ PEEK Polymers 0.000 description 1
- 229920004888 Victrex® 200P Polymers 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 125000000732 arylene group Chemical group 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000412 polyarylene Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Dental Prosthetics (AREA)
Description
本発明は、熱可塑性樹脂の射出成形法や押出成
形法により義歯床を製作する方法に関する。
従来、圧縮成形法による義歯床の製造法として
は、アクリル系のモノマーとポリマーの混合物を
用いて成形後、室温または加熱重合する方法が知
られているが、近年耐熱性、強度などにすぐれた
熱可塑性樹脂を用いた義歯床が開発され、注目を
集めている。
熱可塑性樹脂を用いた義歯床の製造法としては
すでに射出成形法（特公昭57−2023）や押出成形
法が知られている。
いずれも溶融軟化させた熱可塑性樹脂を、人工
歯を内蔵するフラスコ内に射出、もしくは押出し
て賦型させ、冷却固化後にとり出す方式である。
本発明者らは、研究の結果、上記射出成形法や
押出成形法において、通常行なわれている射出成
形や押出成形のように、フラスコ内に内蔵された
人工歯に何らの処置も施さない場合には、人工歯
と義歯床を形成する樹脂との融着が十分でなく、
人工歯が義歯床から脱離しやすいという欠点を有
することがわかつた。
本発明の目的は、上記欠点を改良し、良好な結
果、すなわち人工歯が強固に植えられ、良好な充
填性を有する義歯床が得られる方法を提供するこ
とである。
本発明の特徴とするところは、溶融軟化させた
熱可塑性樹脂を、人工歯を内蔵するフラスコ内に
射出もしくは押出して賦型させ、冷却固化後にと
り出すことによつて義歯床を製作する方法におい
て、該人工歯の根元を80〜300℃に予熱した後該
熱可塑性樹脂をフラスコ内に射出もしくは押出す
ことにある。
本発明において義歯床として使用される熱可塑
性樹脂としては該成形方法で熱的に劣化を起さ
ず、かつ適度な粘度を有し、良好な賦型性をも
ち、歯肉に近似した色に着色が可能で、適度な剛
性と耐湿性を有し、かつ使用時にストレスクラツ
クを起さない強靭性を備えた樹脂であることが要
求される。したがつて、ポリスチレン、ポリメチ
ルメタクリレート、ポリメチルペンテン−１、透
明ナイロン、ポリカーボネート、ポリアリレー
ト、ポリエステルカーボネート、ポリエチレンテ
レフタレート、透明ABS、ポリサルホン系樹脂
などが使用されるが、特にポリサルホン、ポリエ
ーテルサルホンなどポリサルホン系の樹脂が耐湿
性、剛性、耐ストレスクラツキング性などにすぐ
れており、好ましい。本発明で好ましい態様とし
て使用されるポリサルホン系樹脂はアリーレン単
位がエーテルおよびスルホン結合と共に無秩序に
または秩序正しく位置するポリアリーレンポリエ
ーテルポリサルホンとして定義される。たとえば
の構造を有するUCC製ポリサルホンUdel
や
The present invention relates to a method of manufacturing a denture base by injection molding or extrusion molding of thermoplastic resin. Traditionally, compression molding has been used to manufacture denture bases by using a mixture of acrylic monomers and polymers, which is then molded and then polymerized at room temperature or by heating. Denture bases using thermoplastic resin have been developed and are attracting attention. Injection molding method (Japanese Patent Publication No. 1983-2023) and extrusion molding method are already known as methods for manufacturing denture bases using thermoplastic resin. In both methods, a melted and softened thermoplastic resin is injected or extruded into a flask containing an artificial tooth, shaped, and then taken out after being cooled and solidified. As a result of research, the present inventors found that in the injection molding method and extrusion molding method described above, when no treatment is performed on the artificial tooth built in the flask, as in the injection molding or extrusion molding that is usually performed, In some cases, the fusion between the artificial tooth and the resin that forms the denture base is insufficient,
It has been found that artificial teeth have the disadvantage of being easily detached from the denture base. The object of the present invention is to provide a method which improves the above-mentioned drawbacks and provides a good result, namely a denture base in which the artificial tooth is firmly implanted and which has good filling properties. The present invention is characterized by a method for manufacturing a denture base by injecting or extruding a melted and softened thermoplastic resin into a flask containing an artificial tooth, and taking it out after cooling and solidifying. , the thermoplastic resin is injected or extruded into a flask after preheating the root of the artificial tooth to 80-300°C. The thermoplastic resin used as the denture base in the present invention does not undergo thermal deterioration through the molding method, has an appropriate viscosity, has good moldability, and is colored in a color similar to that of the gums. It is required that the resin be able to withstand stress, have appropriate rigidity and moisture resistance, and be tough enough not to cause stress cracks during use. Therefore, polystyrene, polymethyl methacrylate, polymethylpentene-1, transparent nylon, polycarbonate, polyarylate, polyester carbonate, polyethylene terephthalate, transparent ABS, polysulfone resins, etc. are used, but in particular polysulfone, polyethersulfone Polysulfone-based resins such as Polysulfone resins are preferred because they have excellent moisture resistance, rigidity, and stress cracking resistance. The polysulfone resin used as a preferred embodiment in the present invention is defined as a polyarylene polyether polysulfone in which arylene units are located randomly or orderly with ether and sulfone bonds. for example UCC polysulfone Udel with the structure
【式】の構造を有す
るICI製のポリエーテルサルホンVictrex
が挙
げられる。
本発明において使用される人工歯としては、従
来人工歯として一般に使用されているアクリル系
樹脂で形成されたレジン歯、陶歯および、ポリカ
ーボネート歯、ポリアリレート歯、ポリサルホン
歯などが挙げられる。
人工歯用材料としては、天然歯に近似した色に
着色が可能で、適当な剛性と耐摩耗性、耐湿性を
有し、かつ使用時にストレスクラツクを起さない
強靭性を備えた樹脂であることが要求される。
したがつて、前記人工歯以外に、ポリスチレ
ン、ポリメチルペンテン−１、ポリアミド、ポリ
エステルカーボネート、ポリエチレンテレフタレ
ート、透明ABS、ポリエーテルサルホンなどお
よびそれらの樹脂に適当な強化剤を配合した組成
物から形成された人工歯が使用可能である。義歯
床用熱可塑性樹脂と同一もしくは類似の構造ない
しは性質を有する材料から形成された人工歯を用
いた場合に、人工歯と義歯床との密着性がより良
好であり好ましい。
人工歯をフラスコ内に内蔵させる方法は特に限
定されない。
通常実施されている方法、すなわち、人工歯が
植えられたワツクス製の義歯床模型をフラスコ内
に位置させ、石こうもしくはシリコン等を流し込
み硬化させる。石こう等が硬化後、該ワツクスを
通法により加熱軟化させ流出させる方法などが適
用される。
フラスコ内に内蔵された人工歯の根元を予熱す
る方法としては、人工歯の所定の箇所のみを局部
的に熱風もしくは赤外線で加熱する方法、バーナ
ーで加熱する方法など、いずれの方法も適用可能
である。義歯床に植めこまれる部分すなわち人工
歯の根元のみを軟化に近い状態まで加熱し、人工
歯の先端部は形状の変化がない状態で射出成形も
しくは押出成形された場合に、より人工歯と義歯
床の密着性が良好でしかも人工歯の形状が変化の
ない良好な義歯（人工歯と義歯床の組みあわさつ
たもの）が得られるため、人工歯の根元のみを局
部的に加熱する方法が適用される。
人工歯の根元の予熱温度としては、80〜300℃
が必要である。80℃未満であれば予熱効果が乏し
く、人工歯と義歯床の密着が不分である。また
300℃を越した場合には人工歯の軟化変形もしく
は、熱劣化、熱による残留歪などによる人工歯の
強度低下が顕著であり好ましくない。さらに100
〜270℃が人工歯の形状、強度の変化がなく、義
歯床とのより高い密着性が得られるため、好まし
い。
以下、実施例により本発明を具体的に説明する
が、これは好適な態様の例示であつて実施例の範
囲に限定されるものではない。
実施例 １
日本工業規格JIST−6511に記載された人工歯
破折試験法に従い、第１図のとおりポリエーテル
サルホン（ICI製 Victrex
200P）から形成
された人工歯１を、切端部１′と歯頚部１″を結ぶ
線がパラフインワツクス原型と45゜の角度となる
ようにパラフインワツクス原型に植付け、フラス
コ内に石こう埋没後、流蝋し、石こう型を形成さ
せた。
フラスコおよび石こう型を人工歯を内蔵した方
とそうでない方に２分割し、フラスコ内のポリエ
ーテルサルホンから形成された人工歯の根元に
220℃の熱風を２分間吹きつけて予熱した後、分
割されたフラスコを合わせて、シリンダー温度
360℃、射出圧力1500Kg／cm3、射出速度250mm／秒
（成形機：住友−ネスタールP40／25）の条件で、
歯肉様に着色されたポリエーテルサルホンの溶融
樹脂をフラスコ内へ射出注入した。
冷却後、フラスコを分割し、人工歯破折試験用
成形品をとり出した。
第１図のごとく樹脂床部２を保持具３で固定
し、他方の人工歯切端部１′を所定金具４を介し
て、負荷速度12Kgｆ／分で破折試験を行つた。
破折強度は27Kgｆであり、実用上問題のない十
分に高い値を示した。
比較例 １
ポリエーテルサルホンから形成された人工歯を
予熱しないで、その他はすべて実施例１と同様の
条件で成形し、人工歯破折試験を行つた。
破折強度は６Kgｆしかなく、実用上問題となる
低い値しか示さなかつた。
比較例 ２
ポリエーテルサルホンで形成された人工歯を
330℃の熱風を２分間吹きつけて予熱する以外は
すべて実施例１と同様の条件で成形したところ、
人工歯の変形が大きく良好な成形品が得られなか
つた。
実施例 ２
ポリサルホン（UCC製Udel
P1700）から形
成された人工歯が植えられた義歯床ワツクス模型
の埋設されたフラスコを加熱し、ワツクスを軟化
流ろうし、石こう型を形成させた。
フラスコおよび石こう型を人工歯を内蔵した方
とそうでない方に２分割し、フラスコ内のポリサ
ルホンから形成された人工歯の根元に190℃の熱
風を２分間吹きつけ予熱した後、分割されたフラ
スコを合わせて、シリンダー温度340℃、射出圧
力1300Kg／cm3 射出速度200mm／秒（成形機：住
友−ネスタールP40／25）の条件で、歯肉様に着
色されたポリサルホンの溶融樹脂をフラスコ内へ
射出注入した。
冷却後、フラスコを分割し、義歯床をとり出し
た。
人工歯を強く押しても容易にはずれず人工歯が
強固に植えられた義歯床が得られた。
比較例 ３
ポリサルホンから形成された人工歯を予熱しな
いでその他はすべて実施例２と同様の条件で成形
し、義歯床を成形したが、人工歯は軽く押しただ
けで義歯床からはずれた。One example is polyether sulfone Victrex manufactured by ICI, which has the structure of [Formula]. Examples of the artificial teeth used in the present invention include resin teeth made of acrylic resin, porcelain teeth, polycarbonate teeth, polyarylate teeth, polysulfone teeth, etc., which are commonly used as artificial teeth in the past. As a material for artificial teeth, it is a resin that can be colored to resemble natural teeth, has appropriate rigidity, wear resistance, and moisture resistance, and is tough enough to prevent stress cracks during use. something is required. Therefore, in addition to the above-mentioned artificial teeth, artificial teeth made of polystyrene, polymethylpentene-1, polyamide, polyester carbonate, polyethylene terephthalate, transparent ABS, polyether sulfone, etc., and compositions containing these resins and appropriate reinforcing agents can be used. artificial teeth can be used. It is preferable to use an artificial tooth made of a material having the same or similar structure or properties as the thermoplastic resin for denture bases, since the adhesion between the artificial teeth and the denture base is better. The method of incorporating the artificial tooth into the flask is not particularly limited. A commonly used method is to place a wax denture base model with artificial teeth in it in a flask, pour in plaster or silicone, and harden it. After gypsum or the like hardens, a method is applied in which the wax is heated and softened by passing through the wax and then flowed out. Any method can be used to preheat the root of the artificial tooth built into the flask, such as heating only a predetermined part of the artificial tooth locally with hot air or infrared rays, or heating with a burner. be. If only the part to be implanted into the denture base, that is, the root of the artificial tooth, is heated to a state close to softening, and the tip of the artificial tooth is injection molded or extruded without changing its shape, it will be more similar to the artificial tooth. In order to obtain a good denture (a combination of an artificial tooth and a denture base) with good adhesion of the denture base and no change in the shape of the artificial tooth, a method that locally heats only the root of the artificial tooth is recommended. Applicable. The preheating temperature for the root of the artificial tooth is 80 to 300℃.
is necessary. If the temperature is less than 80°C, the preheating effect will be poor and the adhesion between the artificial tooth and the denture base will be inadequate. Also
If the temperature exceeds 300°C, the strength of the artificial tooth will be significantly reduced due to softening and deformation, thermal deterioration, residual strain due to heat, etc., which is not preferable. 100 more
A temperature of ~270°C is preferable because there is no change in the shape or strength of the artificial tooth and higher adhesion with the denture base is obtained. Hereinafter, the present invention will be specifically explained with reference to Examples, but these are illustrative of preferred embodiments and are not limited to the scope of the Examples. Example 1 According to the artificial tooth fracture test method described in the Japanese Industrial Standard JIST-6511, an artificial tooth 1 made of polyether sulfone (Victrex 200P manufactured by ICI) was placed between the incisal end 1' and It was planted in a paraffin wax model so that the line connecting the tooth neck 1'' was at a 45° angle with the paraffin wax model, and after burying the plaster in a flask, it was waxed and a plaster mold was formed. Flask and plaster mold Divide it into two parts, one with an artificial tooth built in and one without, and attach it to the root of the artificial tooth made from polyethersulfone inside the flask.
After preheating by blowing hot air at 220℃ for 2 minutes, put the divided flasks together and adjust the cylinder temperature.
Under the conditions of 360℃, injection pressure 1500Kg/ cm3 , injection speed 250mm/sec (molding machine: Sumitomo-Nestal P40/25),
A molten polyethersulfone resin colored like gums was injected into the flask. After cooling, the flask was divided and molded articles for artificial tooth fracture testing were taken out. As shown in FIG. 1, the resin bed portion 2 was fixed with a holder 3, and the other artificial tooth end portion 1' was subjected to a fracture test with a predetermined metal fitting 4 at a loading rate of 12 kgf/min. The fracture strength was 27 Kgf, a sufficiently high value that poses no problem in practical use. Comparative Example 1 An artificial tooth made of polyether sulfone was molded under the same conditions as in Example 1 without preheating, and an artificial tooth fracture test was conducted. The fracture strength was only 6 kgf, a low value that would pose a practical problem. Comparative example 2 Artificial teeth made of polyether sulfone
When molded under the same conditions as Example 1 except for preheating by blowing hot air at 330°C for 2 minutes,
The deformation of the artificial tooth was large and a good molded product could not be obtained. Example 2 A flask in which a denture base wax model in which artificial teeth made of polysulfone (Udel P1700 manufactured by UCC) were implanted was heated to soften the wax and form a plaster mold. The flask and plaster mold were divided into two parts, one with the artificial tooth built in and one without, and after preheating the root of the artificial tooth formed from polysulfone in the flask by blowing hot air at 190℃ for 2 minutes, the divided flask was divided into two parts. Together, the molten polysulfone resin colored like gums was injected into the flask under the following conditions: cylinder temperature 340℃, injection pressure 1300Kg/cm 3 injection speed 200mm/sec (molding machine: Sumitomo-Nestal P40/25). Injected. After cooling, the flask was divided and the denture base was removed. A denture base was obtained in which the artificial tooth was firmly planted without easily coming off even when the artificial tooth was strongly pressed. Comparative Example 3 An artificial tooth made of polysulfone was molded under the same conditions as in Example 2 without preheating, and a denture base was formed. However, the artificial tooth was removed from the denture base by just being lightly pressed.
第１図は、人工歯破折試験の実施態様を示す側
面図である。
１……人工歯、１′……人工歯の切端部、１″…
…人工歯の歯頚部、２……樹脂床部、３……保持
具、４……人工歯引張り用金具。
FIG. 1 is a side view showing an embodiment of an artificial tooth fracture test. 1...Artificial tooth, 1'...Incisal end of artificial tooth, 1''...
...Tooth neck of artificial tooth, 2... Resin base portion, 3... Holder, 4... Artificial tooth tensioning fitting.
Claims (1)
蔵するフラスコ内に射出、もしくは押出しで賦型
させ、冷却児固化後にとり出すことによつて義歯
床を製作する方法において、該人工歯の根元を80
〜300℃の予熱した後該熱可塑性樹脂をフラスコ
内に射出もしくは押出すことを特徴とする方法。1. A method of manufacturing a denture base by injecting or extruding a melted and softened thermoplastic resin into a flask containing an artificial tooth, and taking it out after cooling and solidifying the resin, in which the root of the artificial tooth is formed. 80
A method characterized in that the thermoplastic resin is injected or extruded into a flask after preheating to ~300°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59084952A JPS60227750A (en) | 1984-04-25 | 1984-04-25 | Fabrication of denture bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59084952A JPS60227750A (en) | 1984-04-25 | 1984-04-25 | Fabrication of denture bed |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60227750A JPS60227750A (en) | 1985-11-13 |
| JPH0250741B2 true JPH0250741B2 (en) | 1990-11-05 |
Family
ID=13844967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59084952A Granted JPS60227750A (en) | 1984-04-25 | 1984-04-25 | Fabrication of denture bed |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60227750A (en) |
-
1984
- 1984-04-25 JP JP59084952A patent/JPS60227750A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60227750A (en) | 1985-11-13 |
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