JPS5862105A - Dental metallic denture base and its preparation - Google Patents

Abstract

PURPOSE:A light-weight dental metallic denture base, consisting of an electrocast metallic layer containing at least one of Ni and Co or further at least one of Cu,Ag,Au,In,B,Sn,P,Cr,Mo, etc., having improved reproducibility, compatibility, adhesion, holding property, etc. without falling off. CONSTITUTION:A dental denture base consisting of an electrocast metallic layer containing at least one of Ni and Co or further at least one of Cu,AG,Au,In,B, Sn,P,Cr,Mo,W,Mn,Fe,Ru,Rh,Pd and Pt. The electrocast metallic layer is prepared by dispersing and depositing a ceramic powder of a metallic oxide, metallic nitride and metallic boride, etc. simultaneously, and the metallic layer is partially or wholly coated with a highly corrosion-resistant metal consisting of Au,Pt, Ag and Cr as principal components. The electrocast metallic layer is electrodeposited on a model substrate impression part, etc. of an electrically conductive material, e.g. an electrically conductive resin, prepared on the basis of an impression obtained from the oral cavity of a patient, and the electrodeposited layer is then peeled from the substrate and finished to give the aimed dental metallic denture base.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dental metal floor that has excellent reproducibility, compatibility, adhesion, retention, etc., is lightweight and does not fall off, and a method for manufacturing the same.

Usually, artificial teeth (also called dentures or dentures) include gold crowns, continuous teeth (tsugiba), dentures (bridges), partial dentures (local dentures), and total dentures (complete dentures).
However, metal bases are particularly suitable for total dentures (full metal plates) and partial dentures (partial metal plates).
It has been used for a long time, but it was not used for orthodontic tooth molds. This is because the clasp wire becomes annealed due to thermal processing (for example, casting) and loses its elasticity, making it unusable. Metal floors used in the field of dentistry (hereinafter referred to as dental metal floors) are conventionally made by the following method. That is, first, an accurate impression of the patient's oral cavity is taken, a master model is formed by injecting a molding material mainly composed of plaster into this impression, and the product metal floor is designed on this master model. A double impression is taken, and a working model is created by injecting, for example, a phosphoric acid-based or gypsum-based investment material and a gypsum-based molding material into the double impression, solidifying and drying, and then placing it in a wax bath to create a working model. Create a pattern, bury it in a plaster mold,
Further firing is performed to produce a hollow mold. Next, a dental metal material molten at high temperature is cast into the obtained hollow mold by a metallurgical method such as centrifugal casting to produce a metal bed in a desired shape. However, as an alternative to this method, explosion molding of metal plates and synthetic resin floors made from synthetic resins such as polysulfone instead of metal have been developed in recent years; Metallurgical methods such as centrifugal casting are the mainstream.

The centrifugal straddle one-surface manufacturing method, which is a typical manufacturing method for conventional dental metal floors, involves casting dental alloys such as those shown in Table 1 into a mold, and after cooling, the mold is destroyed and the metal bed is taken out. , sandblasting, electrolytic polishing, puff finishing, and other surface finishing methods are used, but these conventional methods are advantageous in that they allow for fairly complex designs and provide the desired metal floor in a relatively short period of time. However, it is extremely difficult to improve dimensional accuracy and fit in the oral cavity, and furthermore, the impression reproducibility and thinning are not as good as expected, which may cause discomfort to the patient. many. In addition, due to casting molding using a metallurgical melting method, surface roughness of the molded product may occur.
It just takes a lot of effort and time to finish it.
The shrinkage after casting is large, frustation etc. often occur, and failures in the casting operation also occur, so that it is not satisfactory in terms of technology, cost, and effectiveness of use. On the other hand, in the explosion forming method for metal sheets, it is extremely difficult to manufacture molds for forming, the equipment cost is at least 50 times higher than that of the conventional method, and the resulting metal plate cannot be processed. Because a large amount of stress remains and the embrittlement is significant, many problems must be solved before it can be put to practical use.Also, resin floors such as polysulfone have many problems in terms of thick walls, cracks, and breakage. Therefore, there has been a strong demand for the development of a metal floor that eliminates these conventional defects.

This invention was made to overcome the current situation.At least one of nickel and cobalt,
Alternatively, at least one of copper, silver, gold, indium, boron, tin, phosphorus, chromium, molybdenum, tungsten, manganese, iron, ruthenium, rhodium, palladium, and platinum is dispersed and co-deposited. The present invention also provides a dental metal floor whose surface is partially or entirely coated with a highly corrosion-resistant metal containing at least one of gold, rhodium, platinum, silver, and chromium as a main component, and a method for producing the same. be. The details are described below.

A step of taking a patient's intraoral model of this invention, a step of injecting a mold material mainly composed of plaster into the impression obtained thereby to create a master model, and designing a metal floor on the master model. The process is almost the same as the one used in the past.However, when making a double impression from the obtained master model, a canten is used in the same way as the first impression, but vinyl chloride resin,
Resins such as epoxy resins and polyester resins, as well as other plastic and curable substances may be used. In addition, when creating a working model by injecting and solidifying a molding material mainly composed of gypsum into the obtained double impression, it is possible to use not only molding materials mainly composed of gypsum, but also cement, clay, etc. Inorganic materials, inorganic materials with adhesives, organic materials such as epoxy resin, polyester resin, acrylic resin, paraffin, wax, etc.
Alternatively, these composite materials are put into practical use, but in short, any material that can withstand a temperature of about 70°C and electroforming liquid is sufficient.These materials are usually non-conductive, but there are Make the entire working model conductive by mixing metal powder such as silver, copper, aluminum, or conductive powder or small pieces such as graphite, or make only the surface of the part of the working model to be electroformed. This invention does not apply even if the working model is made partially conductive by applying a silver mirror or chemical plating, or by coating with graphite powder or conductive paint. , will not cause any hindrance.

Here, in order to perform silver mirror or chemical plating, for example, the following prescription can be exemplified. first,
For silver mirrors, the working model is preferably initially mixed with 2-100 f! tannic acid. After immersion treatment in an aqueous solution of /1 and washing with water, stannous chloride 1 to 30971. Hydrochloric acid 1-10
In an aqueous solution containing 0 CC/l as the main component, from room temperature to 50
℃ for 1 to Lθ minutes, and after washing with water, silver nitrate 0.5 to 20
Solution A consisting of 9/1 and an appropriate amount of aqueous ammonia, 1 to 10 CC of trimethylamine, and 1 to 2 glyoxal.
A silver mirror solution consisting of Solution B consisting of 0CC// is adjusted using a sprayer so that both Solutions A and B can be released equally, and is vigorously sprayed onto a predetermined surface of the working model to form a thin silver film.

Such a method can be said to be the most suitable for carrying out the present invention since it is possible to easily produce a conductive thin film.

On the other hand, examples of methods for applying chemical plating include ordinary chemical nickel plating, chemical copper plating, etc., which are immersed in a catalyst solution consisting of palladium chloride, hydrochloric acid, and stannous chloride, and then washed with water. For example, in the case of chemical nickel plating, nickel sulfate is 10 to 40 FI/!
There is an aqueous solution whose main component is sodium citrate 5-60971 and sodium hypophosphite 5-309/l.
H, 4,0-10,0, temperature 30-98℃, plating for 2-30 minutes to obtain a nickel conductive film, and for chemical copper plating, copper sulfate 5-40 fl/l, o
Sse/L/Salt 5~2001i'/l, Formali:/
5~80CC//, pH10~13, temperature 15~
Plating is performed at 40° C. for 2 to 40 minutes to obtain a conductive thin film of copper. Furthermore, graphite powder is applied to the surface of the working model many times with a brush to make the surface black, but this method is difficult to increase conductivity, so it is not the preferred method. First, the conductive paint may be applied by using a paint in which 2 to 70% silver powder is mixed into a resin such as an epoxy resin in the same manner as in ordinary painting.

In this way, all or part of the surface of the working model has been made conductive, with all unnecessary parts coated with vinyl chloride paint, etc., except for the necessary surface, which is the design shape of the metal floor, and the current contact area. Masked with electrically insulating paint and immersed in an electroforming bath for electroforming treatment. An electroforming bath is an electrolyte aqueous solution bath, and the typical ones commonly used are:
As illustrated in Table 1 and Table 2, sulfamic acid bath (1-3), fluoridation bath (4-6), sulfuric acid bath (7-9)
and chloride baths (10 to 12), and all of these baths can be used practically without any particular difference, but most commonly, the sulfamic acid bath is used in terms of residual stress, workability, and finished appearance of the electroformed layer. It can be said that these baths give the best results, followed by the fluoride bath, the sulfuric acid bath, and the chloride bath, in that order. By using such an electroforming bath, a small amount of nickel and cobalt (one kind of each) is electrodeposited on the required surface of the working model.The bath compositions shown in Tables 1 and 2 are for general example 1.
1. Table 2 indicates that the type or concentration of salts used or the type or amount of additives may change, resulting in a slight decrease in electroforming efficiency or changes in the appearance, hardness, etc. of the electroformed metal layer. Even if this problem occurs, it does not fundamentally impede the present invention.

Since nickel and cobalt have extremely similar crystal structures, other physical properties, and chemical properties, it is normally nearly impossible to produce them completely separately.
I would like to assume that there is no discrimination between the two here,
The hardness of the resulting product metal floor reaches its maximum value when the ratio of nickel to cobalt is approximately 70:30. The content ratio of nickel and cobalt depends on the strength of the current applied to the cobalt and nickel electrodes during operation of the electroforming bath. As long as the precipitation of is suppressed, it can be adjusted as desired.

Further, the present invention provides an electroformed layer consisting of at least one of nickel and cobalt, and effective metal elements that can be added thereto, including copper, silver, gold, indium, boron, tin; phosphorus, chromium, and molybdenum. , tungsten, manganese, iron, ruthenium, rhodium, palladium, and platinum.Actually, one or more of these is used, and electrolyte salts of these are used, such as sulfates, chlorides, fluorides, bromides, and sulfamines. It may be added to the electroforming bath in the form of an acid salt or other forms. Here, for iron, copper, silver, gold, palladium, and platinum, at least one of nickel and cobalt
It is possible to add 90% or less of phosphorus and boron to the electroformed metal layer consisting of seeds, and even if it is possible to add 25% or less of phosphorus and boron, it is usually 0.1 to 12.0%. is the most effective and yields a good product metal bed with high toughness and 30 to 120% improvement in hardness, but eutectoid addition of more than 12.0% and less than 25% is almost meaningless. For iron, within the range of 90% or less, the significance of eutectoid is its toughness, hardness,
It is as effective as iron if eutectoid up to 55%
%, it is not preferable because corrosion resistance gradually deteriorates. Silver, gold, platinum, and palladium give good results in the entire range of 90% or less, and greatly improve corrosion resistance, but these results are fully achieved when the addition amount is 20% or less, and even when the amount exceeds 20%. , it cannot be expected to have any greater effect, but only leads to an increase in product costs.On the other hand, iron, copper, silver,
Metal elements other than gold, palladium, platinum, phosphorus, and boron consist of at least one of nickel or cobalt.
It is desirable that the amount is 5% or less with respect to the electroformed metal layer. This is because not only is it difficult to eutectoid with a concentration of 5% or more, both in the laboratory and in the field, but even if the concentration exceeds 5%, the structure will become brittle or the metal appearance will become brittle. This is because the physical properties etc. are impaired.

Furthermore, addition of these additive elements in an amount of 0.1 to 0.5% improves toughness and improves hardness by 20 to 40%, which is extremely effective, but in the range of more than 0.5% to 4%. However, no significant effect is observed, only a slight improvement in hardness is observed, and if it exceeds 4%, almost no effect can be expected.

Here, effects specific to each element other than the common effects of the metal elements added and eutectoid can be summarized as follows.

[Copper]: The product surface shows an extremely beautiful white color after final polishing.

[Silver], [Gold]: Good corrosion resistance and increased compatibility with the patient's oral cavity.

[Indium]: The surface after final polishing exhibits a silvery white color.

[Phosphorus], [Boron]: Despite increasing hardness, toughness is also extremely improved.

[Tin], [Chromco]: Resists organic acids well when used in the patient's cavity.

[Molybdenum], [Manganese], [Tungsten]: Faster finishing and better surface gloss.

[Iron]: Has a wide addition eutectoid range and can supply stable products.

[Ruthenium], [Rhodium], [Platinum], [Palladium]: Excellent corrosion resistance, and the luster does not fade after finishing.

In addition, the electroformed metal layer of the present invention exhibits an even greater effect by dispersing and eutectoiding a small amount of metal oxides, metal nitrides, metal borides, metal carbides, and other ceramic powders. .

That is, the metal oxide is, for example, titanium oxide, aluminum oxide, zirconium oxide, silicon oxide, etc.
Metal nitrides, metal borides, metal carbides, etc. are metals such as titanium, aluminum, silicon, tungsten, molybdenum, manganese, iron, chromium, tantalum, etc., and compounds made of these, and are inorganic materials called ceramics. As for the function and effect of these ceramics as a metal bed, which is the material powder, which is the object of this invention, that is, in terms of toughness and hardness, there is no significant difference in any of the materials, and they can be used in the same way. However, the particle size of these powders is preferably 30P or less, most preferably 1μ or less. This is important in achieving homogeneous dispersion in a certain area, and the finished appearance is good, the toughness of the obtained electroformed metal layer is increased faithfully, and at the same time, the hardness is improved by 1.5 to 3.0 times. As the particle size gradually increases below 1 μm, the finished surface of the electroformed metal layer becomes rougher and the physical properties deteriorate, making it less desirable. Here, the ratio of dispersing and eutectoiding the ceramic powder with a particle size of IP or less into the electroformed metal layer is:
This is an important matter in determining the quality of the product, and the amount of dispersed eutectoid of ceramic powder is 60% of the electroformed metal layer.
Below, it is preferably 3 to 30%. Because 30
If it exceeds 60%, the bond between metals is inhibited and embrittlement progresses gradually, and if it exceeds 60%, brittleness progresses to an extreme level.
This is because, if it is less than %, physical properties such as toughness and hardness are in the process of increasing and have not reached a stable state.

There are many methods for eutectoid dispersion of ceramic powder into an electroformed metal layer, but in general, these ceramic powders are mixed in an electroforming bath to a concentration of 5 to 300 Vl, and then The metal is made to flow violently by stirring with a propeller or jet water stream, and the metal is eutectoid at the same time as the metal is deposited.The amount of eutectoid can be arbitrarily adjusted by adjusting the strength of the stirring or the amount of ceramic powder added to the bath. Normally, the stronger the stirring or the larger the amount added, the higher the eutectoid ratio of ceramic powder. By wrapping the ceramic particles and increasing or decreasing the charge on the ceramic particles, it is possible to increase or decrease the amount of eutectoid, which is unrelated to the two factors mentioned above, such as stirring and addition concentration.
It has been found that because secondary aggregation of ceramic particles can be prevented, the finished appearance can be extremely good even if the amount of eutectoid is small.

The current efficiency for depositing metal on the working model surface in the above electroforming bath is about 70 to 98%, and is usually 1 A/
Electroforming for 1 hour at a current density of dd yields an electroformed metal layer with a thickness of approximately 7 to 12 microns. Therefore, it goes without saying that the cross-sectional thickness of the metal floor of the finished product can be predicted from the current efficiency, deposition thickness per unit time, current density, electroforming time, etc. based on such a guideline. A suitable thickness for the metal bed of the invention is 50 to 2000 microns (most preferably 100 to 1000 microns). This is because if it is less than 50μ, it is too thick and the necessary toughness and strength cannot be obtained.On the other hand, if it exceeds 2000μ, it is too thick, which not only causes discomfort in the patient's mouth but also causes other inconveniences such as falling off. There is no, because it is.

Next, in the metal floor for orthodontics, special consideration is required to fix the wire for the orthodontic clasp (sterilized arch wire, lingual arch, etc.) to the electroformed metal floor, but in this invention, the working model When electroforming, hold and fix the end of the clasp wire in advance by using a jig or embedding it so that it is as close as possible to or in contact with the surface of a predetermined part of the working model, and in this state. The idea is to use electroforming to integrate the electroformed metal floor and the end of the clasp wire. In such operations, the key to success or failure is the structure and thickness of the wire end, how close the wire end can be to the surface of the working model, etc. Therefore, making the end of the wire thinner, making it flattened, or temporarily bonding it with an adhesive are all effective methods.

As mentioned above, depending on the purpose of the product metal floor, an electroformed metal layer is electrodeposited on the surface of the working model to a predetermined thickness, and then, after washing with water, the jig etc. are removed and the electroformed metal layer is peeled off from the surface of the working model. do. This peeling can be easily carried out by a mechanical treatment such as pulling, a chemical treatment using a solvent or a chemical, or a thermal treatment such as thermal decomposition. After the peeling is completed, the electroformed metal floor is washed with water again, and after drying, the front and back surfaces of the electroformed metal floor are finished by sandblasting, chemical polishing, or puff polishing, etc., to give them a glossy appearance.

In addition, there may be a small amount of excess deposits of electroforming around the metal floor, creating protrusions, which must be removed using a dental grinder or other tools. Sometimes it doesn't.

The metal floor finished in this way is preferably made with one or more main components of gold, rhodium, platinum, silver, or chromium, in part or in whole, after confirming that it is compatible with the patient's oral cavity. It is desirable that the metal layer be coated with a highly corrosion-resistant metal layer.

Highly corrosion-resistant metals include alloys with general-purpose metals such as gold threads, alloys of gold and nickel, and alloys of gold and cobalt. Coating with the corrosion-resistant metal layer can be easily carried out by a conventional plating method, without further explanation. When a metal floor is coated with such a highly corrosion-resistant metal layer, it not only increases the value of the product metal floor, but also significantly extends the life of the metal floor, prevents discoloration, etc., and also protects the inner wall of the patient's oral cavity. It has many effects, such as being compatible with each other and not causing any discomfort.

Usually, the thickness of this highly corrosion-resistant metal layer is approximately 20 microns or less (most commonly about 0.1 to 5.0 microns) to sufficiently achieve the purpose.

The metal bed manufactured by the method of this invention is electroformed against the patient's intraoral model at a temperature of usually 100°C or less, and in contact with the interface, so that a shape extremely faithful to the model is reproduced. The compatibility between the resulting metal bed and the patient's oral cavity is extremely good, and the metal structure obtained by electroforming is significantly different from that obtained by conventional metallurgical treatments such as melt casting, and is dense and free of segregation. And,
Even though they have the same composition, they exhibit extremely excellent properties as if they were completely different metals. Furthermore, the dispersed eutectoid electroformed metal layer of ceramic powder is much stronger, and it is possible to reduce the thickness of the product metal bed, which is impossible to achieve using conventional metallurgical methods. Become. In addition, the conventional centrifugal casting method, which requires a hollow model, tends to cause roughness of the product, unnecessary increase in thickness, and poor precision due to the precision of the phosphoric acid or gypsum-based heat-resistant investment material and wax. On the other hand, the present invention has an extremely good appearance and precision, is less likely to generate flakes, is easy to finish, and can be adjusted in thickness as desired. In other words, the center part of the metal base of the product should be made thinner to improve compatibility and eliminate any sense of discomfort, while the peripheral part should be made thicker to improve the retention of the clasp part or denture base (for example, acrylic resin, etc.). Further, as a completely unexpected effect, the thickness of the metal bed of the present invention is approximately 2/3 to 1/3 of the average thickness of a metal bed produced by conventional centrifugal casting. 4, as well as the light weight and excellent compatibility achieved by dispersing and eutectoiding the mixed powder, which has a lower specific gravity than the metal, and patients attested to a significant reduction in the feeling of use. It is possible to enumerate the fact that the dentures did not fall out, which is often seen when wearing complete dentures.

Examples are shown below.

[Example 1] An impression was taken from inside the oral cavity of a patient who required a complete denture, a master model was created by injecting plaster into this impression, and a metal base for a partial denture was placed on top of this master model. (partial metal plate) was designed. Next, a double impression was taken using Kanten, and plaster was injected into this to create a working model. After thoroughly drying this model, dilute vinyl chloride resin paint with thinner and apply it to the entire surface of the model to make it waterproof. After washing with water,
Immerse in an aqueous solution of 10 i/l tannic acid for 1 minute at room temperature. Thereafter, it is washed again with water and immersed for 2 minutes at room temperature in an aqueous solution consisting of 6y4 stannous chloride and 10 cc of hydrochloric acid. After washing with water, equal amounts of solution A, which is made by adding silver nitrate 79/l and aqueous ammonia until the brown precipitate is dissolved, and solution B, which is made up of Griot Gyuzaar 8CC//1) Limethylamine 5α, were sprayed for about 1 minute. The model was sprayed and the surface of the model was plated with copper. After that, wash thoroughly with water and dry at room temperature.
Thoroughly mask the unnecessary parts of electroforming with vinyl chloride paint,
Furthermore, an auxiliary cathode is provided on a part of the masking surface to release excess current during electroforming, and the model is firmly attached to a jig consisting of a copper strip whose unnecessary parts are coated with resin. The electroforming bath was immersed in an electroforming bath so that the material became a cathode.The composition of the electroforming bath was nickel sulfamate 600971, nickel chloride 5 g/1, and poric acid 15 g/l.

Sodium lauryl sulfate O,l Vl, 47℃, pH
4.2. Electroforming was performed for 15 hours at a current density of 3 A/drIl under the conditions of a cathode rocker and continuous flow, to obtain an electroformed metal layer 1 made of nickel with a thickness of 460 μm as shown in FIG. Then, it was taken out of the electroforming bath, washed with water, the jig, interpolation, etc. were removed, and the electroformed metal layer 1 was mechanically peeled off from the surface of the model by inserting a thin iron plate between it and the model. This was sufficiently washed with water and dried, and the entire surface was polished by sandblasting and puff polishing, and surrounding protrusions were removed to obtain the desired partial metal plate. In the partial metal plate of this embodiment, the denture attachment around the electroformed metal layer 1 (outer periphery) is constituted by an anchor part 3 having a mesh opening 2, and an acrylic resin 4 is attached to the anchor part 3.
was attached, and the denture 5 was further fixed. The partial metal plate obtained in this way was found to have extremely good compatibility with the inner wall of the patient's oral cavity, and showed a marked difference compared to the product produced at the same time using the conventional centrifugal casting method. The entire surface of such a partial metal plate was plated with gold to a thickness of 0.5μ, and after washing, drying, and disinfecting, the patient's oral cavity compatibility test was conducted again. Not only did we find no problems at all, but the unexpected result was that the gold-plated dentures were compatible, and the patient was able to wear the dentures comfortably. Moreover, the falling-off phenomenon that is often seen with conventional products does not occur.This is proof that the accuracy is high and that the finish is the same as the intraoral model, so it adheres well to the oral wall. The product was evaluated as having a thin thickness of about 450 μm, making it lightweight, and as a result, did not give a feeling of use.

[Example 2] An impression was taken from the inside of the oral cavity of a patient in need of orthodontics, plaster was injected into the impression to create a master model, and a metal floor for orthodontics was designed on this master model.

Next, a double impression was taken from this using a canten, and a curable polyester resin liquid was injected into the double impression to create a working model. At this time, as shown in FIG. 2, the sterilization arch wire 6 and the lingual arch 1-thia are buried in this working model, and the exposed ends of the sterilization arch wire 6 and lingual arch 7 are placed on the surface of the working model at the necessary locations. It was fixed so that it was close enough to touch lightly. Then, after washing with water, palladium chloride 0. ] J //, 150 CC/g of hydrochloric acid, 57/l of stannous hydrochloride, immersed at room temperature for 3 minutes, washed again with water, 20 f/l of nickel sulfate, 30 Vl of sodium citrate, Sodium hypophosphite 15
In a chemical nickel plating solution consisting of f/l, pH 8,
Plating was performed at 0.42°C for 15 minutes to make the working model conductive. Wash and dry this working model,
Apply epoxy paint to insulate the surface of the area that does not require electroforming, and install an auxiliary cathode using aluminum tape at a position approximately 511n away from the surrounding area where electroforming is required, and attach it to a current contact jig to cover the surface that requires electroforming. It was connected, lightly washed with water, and immersed in a nickel-cobalt electroforming bath. The composition of the bath at this time was 100y// of cobal sulfate, 200y// of nickel sulfate.
, sulfuric acid 50y//, pH 1.0 or less, temperature 65
C. and a current density of 5 A/dd for 15 hours, electroforming metal layer 1 consisting of nickel and cobalt was electrodeposited to a thickness of about 900P. During electroforming, a 3000 resistor (for 3kW) was set between the cobalt plate side of the anode and the power supply to suppress dissolution of cobalt, resulting in an alloy composition ratio of 85% nickel and 85% nickel in the electroformed metal layer 1. The cobalt content was 15%. Also in this example.

A sterilized arch wire 6 and a lingual arch 7 whose main parts are buried in a polyester resin working model and fixed so that the exposed ends are close to the parts of the working model that require electroforming.
were very well embedded in the electroformed metal layer 1 and were already completely integrated.

After that, the working model is washed with water, the jig and the interpolation electrode are removed, the working model is mechanically destroyed, the electroformed metal layer 1 is taken out together with the sterilized arch wire 6 and the lingual arch 7, and the electroformed metal layer 1 is removed with water, dried, polished, and subjected to excess current. The entire surface was finished by removing protrusions around the plate using a grinder to obtain a metal plate for correction as shown in Fig. gJ2. The results of the patient's oral compatibility test for this product showed that the compatibility was extremely good, and neither the sterilization arch wire 6 nor the lingual arch 7 came off easily, and it exhibited sufficient functionality for long-term use. For the patient, the nickel-cobalt alloy was used without any special corrosion-resistant metal plating (although it was completely usable during the orthodontic period).

[Example 3] In order to provide a partial metal plate to a patient with remaining teeth, an intraoral impression was taken, a master model was made from plaster based on this impression, and a partial metal plate was designed. Then take a double impression and add a softening point of 9 to this.
A working model was prepared by injecting beeswax at 0°C.

Graphite powder was applied to the entire surface of this model, and areas not required for electroforming were masked with the wax. At this time, the clasp part was designed to have a band shape, and the clasp part was left in a state where conductivity remained so that the clasp part could be produced by electroforming. Cobalt borofluoride 3509/l, fluoroboric acid 170C without any treatment after centrifuging with a jig.
c/l, anti-pitting agent 0.59/l and average particle size 0.2μ
It was immersed in an electroforming bath to which 9/l of aluminum oxide powder was added, pH 1,Q or less, bath temperature 25℃, current density 2.
Electroforming was carried out at A/d7F1' for about 50 hours while stirring with a noflo spatula at 600 rpm to obtain an electroformed metal layer with a thickness of 1050 μm in which aluminum oxide powder was dispersed and eutectoid with 92% cobalt and 8% aluminum oxide.

After washing and drying this, the jig was removed and the wax was melted and removed using hot air at about 100'C to obtain the desired partial metal plate. However, the thickness of the clasp part made by electroforming was 1400/ Although it reached grade A, it was a smooth strip with few protrusions. The partial metal plate obtained in this example has extremely good compatibility with the remaining teeth of the clasp as well as inside the oral cavity, and the plate body has extremely high toughness and strength. The results showed that there was no discoloration, and the affinity between the oral cavity wall and the partial metal plate was enhanced, making it comfortable for the patient without causing any discomfort.

[Example 4] Impressions were taken from the oral cavity of a patient with remaining teeth, plaster was injected into this to create a master model, a partial metal plate was designed on this, and a double impression was taken using silicone resin. A conductive paste of a modified epoxy resin containing 50% graphite was injected into this double impression together with a hardening agent, and after being left for about 1 hour, the post-impression was removed to prepare a conductive working model. The entire surface of the Kidel that does not require electroforming is masked with vinyl chloride resin paint, and after the jig is set, it is washed with a 3% aqueous solution of potassium permanganate, and further washed with water. , nickel chloride 39/l,
It was immersed in a nickel-iron electroforming bath consisting of 1oy7t of boric acid and 120P/l of iron sulfamate, and electroformed for 15 hours at pH 4.6, bath temperature 50℃, and current density IA/d. An electroformed metal layer with a thickness of 170 μm was obtained. During electroforming, a 1000.300W resistor was set on the iron fence plate side. As in each of the above examples, washing with water, removing the jig,
The desired partial metal plate was obtained by successively releasing the electroformed metal layer. This nickel-iron alloy had extremely stable properties and functioned satisfactorily, but when the surface was plated with rhodium to a thickness of 0.8P, it became harder and had good corrosion resistance. The same effect as described in the example and thin and strong performance were obtained, which was satisfactory.

[Example 5] An impression was taken from a patient requesting a full metal plate, a working model was prepared in the same manner as in Example 1, and the parts requiring electroforming were made conductive using a conductive paint containing 30% silver powder. At this time, a part corresponding to a part of the denture base anchor was designed into a line using the conductive paint, and a jig was placed in the same manner as in each of the above embodiments. Enkel chloride 202/11 boric acid 101i'//, pit inhibitor 0.4 g/l, sodium tungstate sob/
/, silicon oxide xoF with particle size 0.1μ //1 particle size 0.5μ
titanium nitride 102/11 grain size 1μ chromium boride 1 (
1'//, tungsten carbide IOF with grain size of 0.08μ!
// Immersed in an electroforming bath with a pH of 3.9 and a bath temperature of 60°C.
, electroforming was performed for 4 hours at a current density of 8 A/dd with propeller stirring at soorpm, and an electroformed metal layer consisting of 97% nickel and 3% tungsten contained 6% silicon oxide, 2% titanium nitride, and 0 chromium boride. A 370 micron thick electroformed metal layer of ceramic dispersion eutectoid nickel-tungsten containing 0.5% tungsten carbide and 8% tungsten carbide was applied. After washing it with water, the jig was removed and it was peeled off from the working model. After finishing the surface, acrylic resin was molded on a part of the anchor, and a denture was attached to it to obtain the desired full metal plate.

In this example, after further care and finishing, the thickness is 1
．． Palladium having a thickness of 5μ was laminated using a conventional plating method, and the same good results as described in the above example were obtained, and the product could be used without any problems. In addition, the hardness (Hma) of the material obtained in this example by dispersion eutectoid of ceramic powder was 620, and the toughness was extremely high and good.

[Brief explanation of drawings]

FIG. 1 is a plan view schematically showing a partially defective partial metal plate, and FIG. 2 is a plan view illustrating a correction metal plate. 1... Electroformed metal layer, 2... Mesh opening, 3...
Anchor part, 4... Acrylic resin, 5... Denture, 6
... Treated tooth arc wire, 7... Lingual arch patent applicant Shin-Etsu Chemical Co., Ltd. Dokio Ito 1) Diameter - Dodo Michi Ito
Agent Sickle 1) Sentence 2 Figure 1 Figure 2

Claims (8)

[Claims] (1) At least one of nickel and cobalt, or
This includes copper, silver, gold, indium, boron, tin, phosphorus,
At least one of chromium, molybdenum, tungsten, manganese, iron, ruthenium, rhodium, palladium, and platinum
A dental metal floor characterized in that it consists of an electroformed metal layer containing seeds. (2) The electroformed metal layer contains a small amount of ceramic powder such as metal oxide, metal nitride, metal boride, metal carbide, etc.
Claim 1 is a dispersion co-deposition of more than one species.
Dental metal floor as described in section. (3) Part or all of the electroformed metal layer is coated with a highly corrosion-resistant metal whose main component is at least one of gold, rhodium, platinum, silver, and chromium. Dental metal floor as described in section. (4) The dental metal bed according to claim 1, 2, or 3, wherein the electroformed metal layer is integrally fixed to the clasp wire. (5) Plaster manufactured based on impressions from inside the patient's oral cavity;
An impression part made of a non-conductive material such as resin or wax that is made conductive by silver mirror, chemical plating, conductive coating, etc., or an impression made from inside the patient's oral cavity. At least one of nickel and cobalt, or copper, silver, gold, indium, boron, tin, phosphorus, chromium, molybdenum, tungsten, manganese, and iron, is applied to the impression part of the model base made of conductive material such as conductive resin. A method for manufacturing a dental metal floor, which comprises electrodepositing an electroformed metal layer containing at least one of ruthenium, rhodium, palladium, and platinum, and finishing the layer by peeling it off from a model base. (6) The dental metal bed according to claim 5, wherein at least one ceramic powder such as metal oxide, metal nitride, metal boride, metal carbide, etc. is dispersed and eutectoid in the electroformed metal layer. manufacturing method. (7) Part or all of the electroformed metal layer is coated with a highly corrosion-resistant metal whose main component is at least one of gold, rhodium, platinum, silver, and chromium.
1. Method for manufacturing a dental metal floor as described in Section 1. (8) When electrodepositing the electroformed metal layer on the impression part of the model base, the end of the clasp wire made of conductive metal is brought close to the conductive surface of the model base, and the clasp wire is attached to the electroformed metal layer. A method for manufacturing a dental metal floor according to claim 5, 6 or 7, wherein the metal floor is fixed integrally to the layers at the same time.