JP2004041500A - Method for molding tooth form and plaster pulverization device used for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for molding a tooth form which utilizes resources effectively, enables easy kneading and filling, and improves accuracy of the tooth form and a plaster pulverization device used for it. <P>SOLUTION: According to the method for molding the tooth form, an unnecessary tooth form made of a plaster is pulverized into pieces with a diameter equal to or less than 5 mm to be used as a raw material for recycling, and the pulverized materials of diameters approximately 1 mm and between 2-5 mm are mixed with fine powders of the plaster and kneaded with water. The kneaded material is poured into an original die, and a hardened plaster of low shrinkage is obtained. The mixed powder of pulverized materials of grain diameters approximately 1 mm and between 2-5 mm are obtained by the plaster pulverization device which has double rotary axes equipped with circular blades and rotated in the opposite directions mutually. <P>COPYRIGHT: (C)2004,JPO

Description

表１において、粉砕粉末の粒径は、通し回数に応じて次第に細径化されることが示される。実際配合テストによれば、通し回数１回のものが使用「可」であり、２回のものが「良」であり、３回のものが「優」であった。これら実施例から、配合は、１ｍｍ前後のものと、２〜５ｍｍのものとが等量配合されているものが最も適していることが解る。
【００２８】
図４は、石膏微粉末に対する粉砕物の混入量の変化に伴って、フロー値ｆ及び収縮率δが変化することを示している。フロー値とは、混練物をガラス板上に落した場合の広がりの度合いを示しており、コンクリートのスランプフロー値に相当する値である。
【００２９】
図４に示すように、混入量を増すと、フロー値ｆは下がり、混練物の充填がし易くなる。また、収縮率が低下する。収縮率が低下すると、成型精度が向上し、応力歪が少なくなり、ゆがみや曲りが少なくなる。これにより、製品精度が格別向上し、良質の歯を提供できるようになる。混入量の適用範囲は大概５０〜１５０％で、７０〜１００％がより好適である。
【００３０】
以上において、図１〜３に示した石膏粉砕装置１では、ハンドル駆動する例を示したが、電動モータで駆動することもできる。また、受皿１１は、１個付属させる例を示したが、２個付属させても良い。このようにすれば、複数通しを行うとき、交互に利用できる。受口４の上端の形状を適切とすることにより、蓋を受皿１１と兼用できるようにすることもできる。さらに、蓋を逆さにして、この上で受口４に最初に投入する再生原料である歯形の荒砕きを行うこともできる。
【００３１】
本発明は、上記実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲で適宜設計的変更を行うことができ、各種態様で実施できる。
【００３２】
【発明の効果】
以上の通り、本発明は、不要となった石膏製の歯形を再生原料として、これを直径５ｍｍ以下に粉砕し、直径１ｍｍ前後及び直径２〜５ｍｍの粉砕物を石膏原料微粉末と混合して水で混練し、これを前記原型に流し込み、低収縮性の石膏硬化物を得ることを特徴とする歯形成型方法であるので、資源の有効利用を図りつつ、使い易く、しかも歯形精度を格別向上することができる。
【００３３】
また、本発明の石膏粉砕装置によれば、再生原料を投入する原料受口と、これを回転刃を用いて粉砕する粉砕部と、粉砕した粉末を受ける受皿とを有し、前記粉砕部は、軸上に定ピッチで多数の円形刃を備えた一対の回転軸を軸方向に１／２ピッチずらせ、前記円形刃が水平面内で相互に噛み合う形で一定間隔を置いて水平面内に配置して成る回転刃機構と、両回転軸の一端又は両端に設けられ、前記一対の回転軸を相互に逆方向に回転させるギヤと、前記再生原料が両回転軸の両円形刃に噛み合って下方へ案内される方向に、前記両回転軸を回転駆動する駆動機構と、を有するので、簡易構成にして、効率よく所要程度の粉砕物を得ることができる。
【図面の簡単な説明】
【図１】本発明の一実施形態に係る石膏粉砕装置の平面図である。
【図２】図１の右側面図である。
【図３】図１に示した円形刃の側面図である。
【図４】図１で示した石膏粉砕装置で粉砕した粉末を石膏原料微粉末に混入した場合の効果を示す特性線図である。
【符号の説明】
１　石膏粉砕装置
２　框体
３　足部
４　原料受口
５Ｒ、５Ｌ　回転軸
６　円形刃
７　軸受
８　歯車
９　ハンドル
１０　受皿収納部
１１　受皿
１２　粉砕物[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for molding a tooth profile used in dental work and a gypsum crusher used for the method. More specifically, the present invention relates to a tooth forming method and a gypsum crushing apparatus capable of efficiently and highly accurately molding a gypsum tooth profile while effectively utilizing resources.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, when a tooth profile is required for dental work, plaster is poured into a flexible tooth profile prototype made of a thermoplastic material such as amalgam.
[0003]
As the dental gypsum, calcined gypsum [CaSO _4. (1/2) H ₂ O] is mainly used, and a hardened product having high hardness can be obtained by kneading the fine powder with water.
[0004]
The tooth shape made of gypsum is hard and takes the place of a human tooth itself, and is used for dental treatment as a tooth model. Used tooth profiles that are no longer needed are almost discarded as they are meaningless to store.
[0005]
Discarding the unnecessary tooth profile as it is does not cause any pollution. However, the scene where the tooth shape identical to that of a human tooth is discarded in a landfill as it is remains strange. There is a need to explore the possibility of resource reuse.
[0006]
Further, if the gypsum fine powder is kneaded with water, it is sticky and inconvenient. If a large amount of water is mixed in for ease of use, it can be easily poured into the mold, but the shrinkage increases and the finishing accuracy deteriorates.
[0007]
[Problems to be solved by the invention]
In view of the above prior art, the present invention is to provide a tooth forming method that is easy to use and can significantly improve the tooth profile accuracy while effectively utilizing resources.
[0008]
It is another object of the present invention to provide a gypsum crusher which can efficiently crush a recycled material to a required particle size in a gypsum crusher used for the same.
[0009]
[Means for Solving the Problems]
The tooth forming mold method of the present invention for solving the above-mentioned problem is a tooth forming mold method in which a gypsum kneaded material is poured into a mold made of a flexible material to obtain a plaster-made tooth form. As a recycled material, this is pulverized to a diameter of 5 mm or less, a pulverized material having a diameter of about 1 mm and a diameter of 2 to 5 mm is mixed with a gypsum raw material fine powder and kneaded with water. It is characterized by obtaining a gypsum cured product.
[0010]
Therefore, according to the present invention, since the gypsum tooth profile that is no longer needed is used as a recycled material, resources can be effectively used.
[0011]
The powder to be mixed with the gypsum raw material fine powder is 5 mm or less. This powder can be obtained by cracking the recycled material with a hammer or the like. Alternatively, it can be made by beating, crushing, or grinding with a special grinding device.
[0012]
The particle size of the powder to be mixed is a mixture having a diameter of about 1 mm and a diameter of 2 to 5 mm, and the mixing ratio of each particle size is preferably approximately 1: 1 in weight ratio, and the ratio of the total amount to the raw material fine powder is preferable. Is preferably about 1: 0.5 to 1: 1.5. These mixing ratios may be determined by visual examination within the range in order to make it easy to fill the prototype and to use the kneaded product with water easily. It is necessary to mix both those having a diameter of about 1 mm and those having a diameter of 2 to 5 mm.
[0013]
A gypsum tooth profile that is no longer needed is used as a recycled raw material, which is crushed to a diameter of 5 mm or less. Then, not only is it easy to knead and fill the prototype, but also the precision of the finished tooth profile is improved. The reason is that the degree of shrinkage decreases due to the decrease in the amount of added water. Due to the decrease in the degree of shrinkage during curing, not only the accuracy of the unit teeth is improved, but also the overall shape of the arrangement of the teeth is not distorted, and a highly accurate tooth profile can be obtained. These phenomena are very similar to the relationship between cement, sand and gravel in construction concrete. That is, in the present invention, as in the case of concrete sand and gravel, a mixture of a crushed material having a diameter of about 1 mm and a crushed material having a diameter of 2 to 5 mm is required.
[0014]
As described above, according to the present invention, it is possible to easily reuse and remarkably improve the tooth profile accuracy while reusing resources.
[0015]
Further, the present invention is a gypsum crusher for crushing the recycled material to a required particle size, a raw material receiving port for charging the recycled material, a crushing unit for crushing the recycled material with a rotary blade, and receiving the crushed powder. And a crushing unit, wherein the crushing unit shifts a pair of rotating shafts each having a large number of abacus ball-shaped circular blades at a constant pitch on the shafts by 軸 pitch in the axial direction, and the circular blades are mutually shifted in a horizontal plane. A rotating blade mechanism arranged in a horizontal plane at regular intervals as a form meshing with the gear; a gear provided at one or both ends of both rotating shafts for rotating the pair of rotating shafts in opposite directions to each other; A drive mechanism for rotating the two rotating shafts in a direction in which the raw material meshes with the two circular blades of the two rotating shafts and is guided downward. The driving mechanism can be constituted by a handwheel if it is small. It can also be driven to rotate by an electric motor.
[0016]
The pulverizing unit is configured such that a pair of rotating shafts each having a large number of abacus ball-shaped circular blades at a constant pitch on the shaft are shifted by a half pitch in the axial direction, and are arranged at a constant interval so that the two circular blades mesh with each other. And arranged in a horizontal plane. In order to prevent slippage with the recycled material, an appropriate notch or groove may be formed on the circumference of the circular blade.
[0017]
Therefore, according to the gypsum crusher of the present invention, the gypsum put in the raw material receiving port can be crushed by the rotary blade and crushed to a required particle size. The particle size can be appropriately adjusted by appropriately setting the interval between the two rotating shafts.
[0018]
The required particle size is a particle size that is approximately 1: 1 for a pulverized product having a diameter of about 1 mm and a pulverized product having a diameter of 2 to 5 mm, and that is appropriately determined by a dental worker.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 3 are a plan view and a right side view of a gypsum crusher according to an embodiment of the present invention, and a side view of a circular blade. As shown in the figure, the gypsum crusher 1 of the present invention has a frame 2 of about 150 mm in length and about 220 mm in depth and about 220 mm in depth, and on its bottom surface, it can be fixed to a desk or table using a not-shown clamping device or the like. A foot 3 is provided.
[0020]
In the upper part of the frame body 2, a hopper-shaped receiving port 4 having an elongated rectangular outlet is formed on the lower surface, and a pair of rotating shafts 5R and 5L are formed on the lower surface of the outlet lower surface along the longitudinal direction. Are arranged side by side at an interval D. The interval D is, for example, 30 mm. The diameter of the rotary blade is, for example, 30 mm, and the diameter of the central axis is, for example, 12 mm.
[0021]
Each of the rotating shafts 5R and 5L has a large number of abacus ball-shaped circular blades 6 at a constant pitch, and is arranged so that the circular blades 6 are meshed with each other and are displaced in the axial direction by 形 pitch. As shown in FIG. 3, on the circumference of the circular blade 6, a large number, for example, eight grooves 6a are cut at equal intervals. The groove 6a is for increasing the frictional force between the raw material and the raw material to crush the raw material. The cut angle α of the groove 6a is suitably from 30 to 90 °.
[0022]
Both ends of each of the rotating shafts 5R and 5L are supported on the frame 2 via resin bearings 7. One end, for example, the right end in FIG. 1, is gear-coupled via a gear 8 having the same number of teeth. The other end of one rotation shaft 5L is coupled to a handle 9 that can be rotationally driven by manual operation.
[0023]
Further, the lower part of the frame body 2 has an opening for receiving the tray 11 along the rotating shafts 5R and 5L, so that the tray 11 can be freely inserted and removed from the opposite direction of the handle 9.
[0024]
In the above configuration, when the line connecting the outer peripheral end of the circular blade 6 provided on each rotary shaft 5R or 5L is matched with that of the other rotary shaft 5L or 5R, the adjacent rotary blade 6 of the circular blade 6 A gap can be formed between the two rotating shafts 5R and 5L according to the amount of dents generated between them, and the maximum particle size of the pulverized material 12 is determined by this amount. Although the lid is not shown, it can be appropriately designed to cover the receiving port 4. The lid can be turned upside down and the tooth profile, which is a recycled material, can be roughly divided.
[0025]
The operation of the gypsum crushing apparatus 1 having the above-described configuration will be described. The raw material, which is an unnecessary gypsum tooth profile (not shown), is roughly divided into several cm in size, put into the receptacle 4, and the handle 9 is rotated by hand. By doing so, the pulverized material 12 can be obtained. If the pulverized material is too rough, it can be passed twice or three times.
[0026]
Examples are shown in Table 1 below.
[0027]
[Table 1]

In Table 1, it is shown that the particle size of the pulverized powder is gradually reduced according to the number of passes. In fact, according to the compounding test, one with a single pass was "useful", two was "good", and three was "excellent". From these examples, it can be seen that the most suitable compound is one in which approximately 1 mm and 2 to 5 mm are mixed in equal amounts.
[0028]
FIG. 4 shows that the flow value f and the shrinkage δ change with the change in the amount of the pulverized material mixed into the gypsum fine powder. The flow value indicates a degree of spread when the kneaded material is dropped on a glass plate, and is a value corresponding to a slump flow value of concrete.
[0029]
As shown in FIG. 4, when the mixing amount increases, the flow value f decreases, and the kneaded material is easily filled. Also, the shrinkage decreases. When the shrinkage rate decreases, molding accuracy improves, stress strain decreases, and distortion and bending decrease. As a result, the precision of the product is particularly improved, and a high-quality tooth can be provided. The application range of the mixing amount is generally 50 to 150%, and 70 to 100% is more preferable.
[0030]
In the above, in the gypsum crusher 1 shown in FIGS. 1 to 3, the example in which the handle is driven is shown, but the gypsum crusher 1 may be driven by an electric motor. Further, the example in which one tray 11 is attached is shown, but two trays 11 may be attached. In this way, when a plurality of passes are performed, they can be used alternately. By making the shape of the upper end of the receptacle 4 appropriate, the lid can also be used as the tray 11. In addition, the lid can be turned upside down, and the tooth shape, which is the recycled material to be initially charged into the receiving port 4, can be roughly crushed.
[0031]
The present invention is not limited to the above embodiment, and can be appropriately changed in design without departing from the gist of the present invention, and can be implemented in various modes.
[0032]
【The invention's effect】
As described above, the present invention uses a gypsum tooth profile that is no longer needed as a recycled raw material, grinds it to a diameter of 5 mm or less, and mixes a ground product of about 1 mm in diameter and 2 to 5 mm in diameter with fine powder of gypsum raw material. Kneading with water, pouring the mixture into the mold, and obtaining a low-shrinkage gypsum cured product, it is easy to use while effectively utilizing resources, and the tooth profile accuracy is exceptional. Can be improved.
[0033]
Further, according to the gypsum crushing apparatus of the present invention, a raw material receiving port for charging the recycled raw material, a crushing unit for crushing the raw material using a rotary blade, and a receiving tray for receiving the crushed powder, the crushing unit, A pair of rotating shafts provided with a large number of circular blades at a constant pitch on the shaft are shifted in the axial direction by ピ ッ チ pitch, and the circular blades are arranged in a horizontal plane at regular intervals so as to mesh with each other in a horizontal plane. A rotating blade mechanism, which is provided at one or both ends of both rotating shafts, and a gear for rotating the pair of rotating shafts in opposite directions to each other; Since it has a drive mechanism for rotating the two rotating shafts in the guided direction, it is possible to obtain a required degree of pulverized material efficiently with a simple configuration.
[Brief description of the drawings]
FIG. 1 is a plan view of a gypsum crusher according to an embodiment of the present invention.
FIG. 2 is a right side view of FIG.
FIG. 3 is a side view of the circular blade shown in FIG. 1;
FIG. 4 is a characteristic diagram showing an effect when the powder pulverized by the gypsum pulverizing apparatus shown in FIG. 1 is mixed into a gypsum raw material fine powder.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Gypsum crusher 2 Frame 3 Foot 4 Raw material receiving port 5R, 5L Rotary shaft 6 Circular blade 7 Bearing 8 Gear 9 Handle 10 Receiving tray storage part 11 Receiving tray 12 Crushed material

Claims (2)

In a tooth forming method in which a gypsum kneaded product is poured into a prototype made of a flexible material to obtain a plaster tooth profile,
The gypsum tooth profile which became unnecessary was used as a recycled raw material, which was crushed to a diameter of 5 mm or less, and a crushed material having a diameter of about 1 mm and a diameter of 2 to 5 mm was mixed with a gypsum raw material fine powder and kneaded with water. A tooth forming mold method, wherein the method is poured into a prototype to obtain a low-shrinkage plaster cured product. A gypsum crusher for crushing the recycled material according to claim 1 to a required particle size,
A raw material receiving port for charging the regenerated raw material, a crushing unit for crushing the raw material using a rotary blade, and a receiving tray for receiving the crushed powder,
The crushing unit is configured to shift a pair of rotating shafts having a large number of circular blades at a constant pitch in the axial direction by １ ／ pitch, and to arrange the circular blades in a horizontal plane at regular intervals so as to mesh with each other in the horizontal plane. A rotary blade mechanism comprising:
A gear provided at one or both ends of both rotating shafts, for rotating the pair of rotating shafts in opposite directions,
A gypsum crusher, comprising: a drive mechanism for rotating the two rotating shafts in a direction in which the regenerated raw material meshes with the two circular blades of the two rotating shafts and is guided downward.

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