JP2020158395A - Dental molded body and dental resin material - Google Patents

Abstract

To provide dental molded bodies and dental resin materials that can be easily adapted to an oral mucosal surface in patients.SOLUTION: Provided is a dental molded body having a predetermined shape used in the oral cavity and containing polycaprolactone, thermoplastic polyester resin, powdered silica, ascorbic acid, titanium oxide, pigment, and zinc stearate. The weight ratio to polycaprolactone is set to 5 to 30% for thermoplastic polyester resin, 5 to 25% for powdered silica, 0.3 to 1.8% for ascorbic acid, 0.001 to 0.02% for titanium oxide, 0.001 to 0.1% for pigments, and 0.001 to 0.1% for zinc stearate, respectively.SELECTED DRAWING: Figure 1

Description

The present invention relates to dental moldings and dental resin materials.

As a dental molded body, a denture base of a denture (denture), a crown prosthesis, a temporary covering crown, an artificial tooth and the like are known (see, for example, Patent Document 1 below).

Japanese Patent No. 5055397

The denture base, which is representative of the dental molded body, is generally manufactured by taking an impression (molding) by a dentist. However, it is difficult to improve the accuracy of the mold obtained by taking this impression because the thickness, hardness, etc. of the movable mucosal area of the jaw are not constant, and it is difficult to improve the accuracy of the mold obtained by taking this impression. Combined with some proficiency of the dentist, the denture base produced is often incompatible with the patient's oral cavity. If the manufactured denture base is incompatible with the patient's oral cavity, stable wearing cannot be expected in the patient's oral cavity, and the denture base can be easily detached when eating or drinking.

The subject of the present invention is dentistry that can be easily adapted to the patient's oral mucosal surface and gingiva even if stable wearing is not expected in the patient's oral cavity due to the inaccuracy of impression taking. The purpose of the present invention is to provide a molded body and a dental resin material.

Means for Solving Problems and Effects of Invention

In order to solve such a problem, the first of the present invention is a dental molded body containing polycaprolactone having a predetermined shape and used in the oral cavity, which is a thermoplastic polyester resin and powdered silica. A thermoplastic polyester resin having a weight ratio of 5 to 30% to polycaprolactone, powdered silica having a weight ratio of 5 to 25% to polycaprolactone, and a weight ratio to polycaprolactone of 0.3 to 1. 8% ascorbic acid, titanium oxide with a weight ratio of 0.001 to 0.02% to polycaprolactone, a pigment with a weight ratio of 0.001 to 0.1% to polycaprolactone, and a weight ratio to polycaprolactone It is characterized by containing 0.001 to 0.1% of zinc stearate, with the balance being polycaprolactone and unavoidable impurities.

The first and more desirable invention of the present invention described above is a dental molded body containing polycaprolactone having a predetermined shape and used in the oral cavity, wherein the weight ratio to polycaprolactone is 10 to 25%. Plastic polyester resin, powdered silica with a weight ratio of 5 to 20% to polycaprolactone, ascorbic acid with a weight ratio of 0.3 to 1.8% to polycaprolactone, and a weight ratio of 0.001 to 0.001 to polycaprolactone. 0.02% titanium oxide, a pigment with a weight ratio of 0.001 to 0.1% to polycaprolactone, zinc stearate with a weight ratio of 0.001 to 0.1% to polycaprolactone, and the balance is poly. It is characterized by containing caprolactone and unavoidable impurities.

Further, in order to solve the above-mentioned problems, the second aspect of the present invention is a dental resin material containing polycaprolactone, which is used in association with a dental molded body used in the oral cavity, and is a thermoplastic polyester. A thermoplastic polyester resin having a resin and powdered silica having a weight ratio of 5 to 30% to polycaprolactone, powdered silica having a weight ratio to polycaprolactone of 5 to 25%, and the balance being polycaprolactone and unavoidable impurities. It is characterized by including.

The second more desirable invention of the present invention described above is a dental resin material containing polycaprolactone, which is used in association with a dental molded body used in the oral cavity, and has a weight ratio to polycaprolactone. It is characterized by containing 10 to 25% of a thermoplastic polyester resin, powdered silica having a weight ratio of 5 to 20% to polycaprolactone, and the balance of polycaprolactone and unavoidable impurities.

The dental molded body and the dental resin material according to the present invention (hereinafter, when both are collectively referred to as a dental molded body or the like) have polycaprolactone, a thermoplastic polyester resin, and powdered silica as resin components. However, the weight ratio of the thermoplastic polyester resin to polycaprolactone is 5 to 30%, the weight ratio of powdered silica to polycaprolactone is 5 to 25%, and the remaining resin component is polycaprolactone.

The thermoplastic polyester resin is well known by itself, and commercially available thermoplastic polyesters such as polyethylene terephthalate (PET resin), polybutylene terephthalate (PBT resin), and polyethylene naphthalate (PEN resin) are used. can do.

The powdered silica (filler) affects the viscosity, bending strength, etc. of the material such as a dental molded product in combination with the content of polycaprolactone. The powdered silica has an amorphous, spherical or cotton-like shape, and has a particle size of, for example, about 1 to 100 nm.

As a result, the dental molded product or the like according to the present invention has a melting point of about 60 to 85 ° C., while having high bending strength and tensile strength at room temperature. Therefore, for example, when a dentist attaches a denture base as a dental molded body according to the present invention to the oral cavity of a patient, it is immersed in hot water at about 70 to 75 ° C. for about 30 seconds to be in a softened state. By strongly pressing the denture base against the oral mucosal surface of the patient, the inner surface (back surface) of the denture base can be adapted to the shape of the oral mucosal surface (fit to the ridge). Therefore, while it is possible to make up for the shortcomings in impression taking, it is possible to easily manufacture a denture base with high adsorptive power that is suitable for the oral mucosal surface of the patient without taking impressions for the patient. It becomes possible to do.

In addition, the patient himself soaks the dental resin material in hot water at about 70 to 75 ° C. for about 30 seconds, and the softened dental resin material is attached to the inner surface (back surface) of the existing denture in the oral cavity. If it is strongly pressed against the mucosal surface, it is possible to satisfactorily prevent the denture from coming off the oral cavity due to its adsorptive action. That is, the dental resin material according to the present invention can be used as a substitute for a so-called denture stabilizer.

As described above, the dental molded article or the like according to the present invention contains at least about 45% of polycaprolactone. Polycaprolactone is a biodegradable resin material, has partial crystallinity (quasicrystalline polymer), and is capable of chemically strong bonding with other non-crystalline resins. However, when the homopolymer alone molded product is used in the oral cavity, hydrolysis due to oxidation is remarkable, and the homopolymer must be used for a short period of time. On the other hand, it has a low melting point (about 60 ° C.) and has a characteristic that its shape can be freely changed by immersing it in hot water above that temperature. The present invention has led to the discovery of a dental molded product or the like that can be used for a long period of time in the oral cavity by taking advantage of its characteristics while eliminating such drawbacks of polycaprolactone.

Further, in the dental molded article or the like according to the present invention, the weight ratio of the thermoplastic polyester resin to polycaprolactone is 5 to 30%, and the weight ratio of powdered silica to polycaprolactone is 5 to 25%. Preferably, the weight ratio of the thermoplastic polyester resin to polycaprolactone is 10 to 25%, and the weight ratio of powdered silica to polycaprolactone is 5 to 20%. In terms of the weight ratio of both the thermoplastic polyester resin and the powdered silica to polycaprolactone, 20 to 40% is effective, and 30 to 35% is even more effective.

When the weight ratio of the thermoplastic polyester resin to polycaprolactone is 5 to 30% and the residual resin component is polycaprolactone, resin deterioration due to hydrolysis of polycaprolactone in the oral cavity can be prevented, and a dental molded body or the like can be prevented. While optimizing the hardness of the resin for the human body, it is possible to prevent the occurrence of peeling fractures such as peeling and cracking when the resin is placed in the oral cavity, and to suppress an increase in the melting point. The dental molded product or the like according to the present invention has a melting point of about 65 to 80 ° C. These effects are effective when the weight ratio of the thermoplastic polyester resin to the polycaprolactone is 5 to 30% and the weight ratio of the powdered silica to the polycaprolactone is 5 to 25%, and the weight ratio is the thermoplastic polyester. It is even more effective when the resin content is 10 to 25% and the powdery silica content is 5 to 20%.

If the weight ratio of the thermoplastic polyester resin to polycaprolactone is less than 5%, resin deterioration due to hydrolysis of polycaprolactone is likely to occur. On the other hand, if the weight ratio of the thermoplastic polyester resin to the polycaprolactone exceeds 30%, the chemical bonding force is weakened in the case of the artificial tooth bed made of the non-crystalline resin, and the risk of peeling and fracture increases. This property is unsuitable for a dental molded product. In addition, as the melting point rises, workability for changing the shape deteriorates.

Ascorbic acid, which is one of the additive components of the dental molded product or the like according to the present invention, can prevent the oxidation of the dental molded product or the like and improve the durability, and eventually the dental molded product or the like can be placed in the oral cavity. It can be adapted to the environment and maintain their functions for a long period of time. If the weight ratio to polycaprolactone is less than 0.3%, the role of antioxidant cannot be sufficiently fulfilled. On the other hand, when the weight ratio exceeds 1.8%, the effect is saturated. Therefore, the weight ratio of ascorbic acid to polycaprolactone was set to 0.3 to 1.8%. Preferably, it is 0.6 to 1.2%.

When the dental molded body is brought close to the color of the gingiva in the oral cavity, the resin is dyed pink. Titanium oxide and pigments (eg, red pigments) are added for coloring (coloring). For example, in order to produce a color close to the actual gingiva (pink), the mixing ratio of the red pigment and titanium oxide (white) is adjusted.

The content of titanium oxide and pigments is mainly determined by how the dyeing is done. Titanium oxide has a weight ratio of 0.001 to 0.02% with respect to polycaprolactone. If this weight ratio is less than 0.001%, the role of color adjustment for the pigment cannot be fulfilled. On the other hand, if it exceeds 0.02%, it deviates from the color adjustment function and impairs physical properties such as strength of the resin material. Therefore, when the dental molded body is brought close to the color of the gingiva in the oral cavity, the weight ratio of titanium oxide to polycaprolactone was set to 0.001 to 0.02%. Preferably, it is 0.003 to 0.01%.

Pigments (eg, red) have a weight ratio of 0.001 to 0.1% to polycaprolactone. If this weight ratio is less than 0.001%, the dyeing effect of making the color close to the gingiva cannot be obtained. On the other hand, if it exceeds 0.1%, the desired dyeability is rather impaired, and the physical properties of the resin material are also unfavorable. Therefore, when the dental molded body is brought close to the color of the gingiva in the oral cavity, the weight ratio of the pigment to polycaprolactone was set to 0.001 to 0.1%. It is preferably 0.001 to 0.008%.

Zinc stearate contributes to the stirring property of uniformly mixing titanium oxide, the pigment and the polycaprolactone resin, and by extension, the uniform dyeing property of uniformly developing a color, and improves the stirring property and the mixing property of the additives. This zinc stearate has a weight ratio of 0.001 to 0.1% with respect to polycaprolactone when a pigment (for example, a red pigment) is added. If this weight ratio is less than 0.001%, the effect of improving the agitation and mixing properties in dyeing cannot be expected. On the other hand, if it exceeds 0.1%, stirring and mixing itself becomes difficult. Therefore, when the dental molded body is brought close to the color of the gingiva in the oral cavity, the weight ratio of zinc stearate to polycaprolactone was set to 0.001 to 0.1%. It is preferably 0.001 to 0.05%. The same effect can be obtained by using, for example, magnesium stearate in addition to or in place of zinc stearate.

By adding zinc stearate, titanium oxide and pigment in this way, dyeing suitable for a dental molded product becomes possible, and further, the fluidity of the resin during injection molding is increased, so that the dental molded product can be dyed. The reproducibility of details is improved. In addition, when the dental molding is attached and detached in the oral cavity, the above-mentioned additives can reduce the resistance due to friction between the residual tissue and teeth in the patient's oral cavity and the dental molding, resulting in slippage. It will be good. As a result, the dental molded body can be easily attached and detached in the patient's oral cavity.

The dental molded body may have any one form selected from, for example, a denture base, a crown prosthesis, a temporary covering crown, and an orthodontic appliance. it can.

The denture base is, for example, a denture base of a complete denture or a denture base of a partial denture, supports an artificial tooth, and functions as a mounting portion in the oral cavity. More specifically, it includes a wire (oral maintenance device: also called a clasp) and a metal-free denture base (non-clasp denture base). In such a denture base, it is generally colored pink corresponding to the color of the gingiva, a red pigment is used for the coloring, and titanium oxide is used as a white additive mixed therewith. It is also possible to add iron oxide as a dull color additive to the red pigment to produce a natural color close to the actual gingival color.

A crown prosthesis is a very thin prosthesis (aesthetic laminate) that is attached to the patient's anterior teeth to enhance aesthetics, or a restoration that repairs when a tooth is severely broken, and repairs all or part of the tooth. Includes inlays, artificial crown crowns, bridges that are bridged by scraping the tooth next to the missing tooth to make it an abutment tooth. Further, the crown restoration material is a material for repairing an artificial crown or a natural crown that is directly broken and damaged in the oral cavity, and the product of the present invention can be used as a crown restoration material.

In the case of crown prostheses, temporary covering crowns and orthodontic appliances, it is not always necessary to color them in a reddish color corresponding to the color of the gingiva, but when there is a purpose such as making the existence of the crown inconspicuous. Can be colored corresponding to the gingiva as in the denture base. When the temporary covering crown and the orthodontic appliance do not correspond to the color of the gingiva, a pigment of a desired color may be used together with titanium oxide or iron oxide to color the gingiva to an appropriate color.

Temporary crowns are used for a limited period of time (temporary) rather than for long periods of time, such as mouthpieces, temporary teeth that are temporarily worn after tooth extraction, and crowns that are worn until the implant stabilizes after implanting. And so on. Orthodontic appliances are installed in the oral cavity for, for example, correction of maxillary and lower jaw engagement, correction of tooth bed, correction of tooth alignment and tooth angle, and the like.

In addition, the dental molded body of the present invention can be used as a substitute for a maintenance device (clasp) for maintaining a partial denture (partial denture), a device for bridging between the back teeth of the maxilla (paratal bar), and the like. Is.

By making the dental molded body such as the denture base, crown prosthesis, temporary covering crown, orthodontic appliance, etc. made of resin containing polycaprolactone as a main component, the concern about metal allergy can be eliminated. In addition, since it has extremely low water absorption, it is difficult to contain water, and there is no stagnation of germs, so it is hygienic. On the other hand, in the case of polyamide or nylon, for example, a non-scrap denture (a denture base that does not use a wire or metal as a clasp), the adhesive force between the artificial tooth and the denture base is insufficient, so that the artificial tooth and the denture base are not sufficiently adhered. It tends to be unsanitary due to the invasion and stagnation of food residues at the border of the area and the growth of germs. On the other hand, in the case of the dental molded body according to the present invention, it is possible to chemically bond the artificial tooth and the denture base by using a solvent, and it is possible to effectively suppress the growth of various germs. It is possible.

The dental molded product according to the present invention may be provided with a coating layer of acrylic resin or epoxy resin located so as to cover the surface of the dental molded product in a state of being adhered to the surface of the dental molded product. According to this, the surface of the dental molded product can be covered with an acrylic resin or an epoxy resin, and it is possible to prevent the surface of the dental molded product from becoming rough in the oral cavity of the patient. Further, since the coating layer is an acrylic resin or an epoxy resin, it is possible to adhere the coating layer to polycaprolactone. Specifically, by using an existing acrylic or epoxy-based dental surface lubricant, it is possible to prevent the surface of the dental molded product from becoming rough.

Further, since the dental molded body according to the present invention has excellent dimensional stability, it can be precisely adapted to the tooth mold (impression) collected by the dentist, especially in the case of a non-scraping denture. Can be provided to the patient with an excellent fit. The dental molded body according to the present invention has a high elastic modulus and is also excellent in stability as a denture base.

The dental molded body according to the present invention as described above is produced by melting various forms of resin materials such as pellets, sheets, and blocks, and for example, injection molding or injection molding. The dental molded product according to the present invention is produced by melting or mixing polycaprolactone and a thermoplastic polyester resin. As a result, unlike the case where only acrylic resin that causes resin allergy to the human body is used as a material, resin allergy does not occur to the human body. Similarly, unlike the case where a polycarbonate resin or the like that elutes bisphenol A or the like is used as a material, it is possible to produce a dental molded article that does not elute bisphenol A or the like and has excellent safety. The dental molded product according to the present invention can sufficiently secure an adhesive force with another resin and can be adapted to the environment in the oral cavity of a patient.

The dental resin material according to the present invention can be used, for example, as a denture base lining material, a denture base repair material, a denture base reinforcement material, a crown prosthesis material, and a crown restoration material. The denture base lining material functions to readjust the height of the denture base, the denture base repair material functions to repair the damaged part of the denture base, and the denture base reinforcement material lacks strength in the denture base. It fulfills the function of strengthening the part to be treated. Since the denture base lining material is provided on the inner surface side (oral mucosal surface, gingival side) of the denture base, there is no particular limitation on coloring. As for the denture base repair material and the denture base reinforcing material, when it is provided on the inner surface side of the denture base, there is no particular limitation on coloring as in the denture base repair material, but when it is provided on the outer surface side of the denture base, the oral cavity Coloring corresponding to the color of the mucous membrane and denture can be applied.

Further, a denture base as a dental molded body according to the present invention, or a denture made of an amorphous resin such as PMMA resin (polymethylmethacrylate), PET resin (polyethylene terephthalate), PSU resin (polysulphon) resin, etc. When the floor body is internally lined with the denture base lining material as the dental resin material according to the present invention, the softening temperature of the denture base lining material is about 70 to 75 ° C. The denture base body can be attached to the oral cavity by immersing the patient in hot water at about 70 to 75 ° C. to soften the inner surface of the denture base and pressing it strongly in the oral cavity in the softened state.

When the denture base body made of an amorphous resin made of only PMMA is internally lined with the denture base lining material as the dental resin material according to the present invention, for example, a dichromethane primer or an acrylic monomer is used. Can be chemically firmly bonded by applying the above to the joint. Further, since the denture base lining material as a dental resin material according to the present invention has a property of being firmly bonded, it is possible to increase the amount by softening.

Further, when the denture base reinforcing material as the dental resin material according to the present invention is used for the conventional denture base made of only PMMA, the defect of the conventional denture base that it is easily broken is satisfactorily eliminated. Is possible. Further, when a non-scrap denture (a denture base that does not use a wire or metal as a clasp) is produced as the dental molded body according to the present invention, the produced molded product can be constructed and repaired. For example, if a patient undergoes maxillary resorption (morphological change of the defective maxillary ridge) after the preparation of a non-scrap denture, the dentist himself changes the shape of the denture base by softening, or the dental use according to the present invention. By constructing and repairing the shape of the inner surface of the denture base using the denture base backing material as a resin material, it is possible to easily improve the fitting accuracy.

By the way, when the denture base used by the patient is not the dental molded body according to the present invention, or the denture base made of PMMA resin or the like used by the patient is used as the dental resin material according to the present invention. When the inner surface is not lined with a denture base lining material, it is common for the patient to use an existing denture stabilizer to stabilize the denture base in the oral cavity.

In this case, the denture base stabilizer as the dental resin material according to the present invention is softened by immersing the patient in hot water at about 70 to 75 ° C., and the inner surface (back surface) of the denture base used by the patient in the softened state. ), And the denture base can be attached into the oral cavity by pressing it strongly against the oral mucosal surface. The denture base stabilizer as a dental resin material according to the present invention is excellent in wearing comfort and can sufficiently secure stability as a denture base.

The figure which shows the partial denture as the dental molded body of this invention. The figure which shows the example which attached the partial denture of FIG. 1 in the oral cavity of a person. The figure which shows the crown which is an example of the crown prosthesis as the dental molded body of this invention. The figure which shows the aesthetic laminate which is an example of the crown prosthesis as the dental molded article of this invention. The figure which shows the example which attached the aesthetic laminate of FIG. 4 to the front tooth of a person. The figure which shows an example of the orthodontic appliance as the dental molded body of this invention. The figure which shows the example which attached the orthodontic appliance of FIG. 6 in the oral cavity of a person. The figure which shows the mouthpiece which is an example of the temporary covering crown as a dental molded article of this invention. The figure which shows the use example of the denture base repair material as the dental resin material of this invention. The figure which shows the use example of the denture base stabilizer as the dental resin material of this invention. The figure which shows the use example of the denture base stabilizer as the dental resin material of this invention.

1 to 8 show examples of the dental molded body of the present invention, FIG. 1 shows an example of a denture base 1a (reference numeral 1b is an artificial tooth) of a partial denture 1, and FIG. 2 shows the partial denture. An example of wearing 1 in the oral cavity of a person is shown. FIG. 3 shows an example of a crown 2 (crown prosthesis), FIG. 4 shows an example of an aesthetic laminate 3 (crown prosthesis), and FIG. 5 shows an example of the aesthetic laminate 3 attached to a person's front teeth. FIG. 6 shows an example of the orthodontic appliance 4, and FIG. 7 shows an example of wearing the orthodontic appliance 4 in the oral cavity of a person. FIG. 8 shows an example of a mouthpiece 5 (temporary covering crown).
9 to 11 show examples of the dental resin material of the present invention, FIG. 9 shows an example of using the denture base repair material 6a (reference numeral 6 is a complete denture), and FIG. 10 shows a denture base stabilizer. An example of a complete denture 6 to which 6b is attached is shown, and FIG. 11 shows an example of a complete denture 7 to which the artificial denture base stabilizer 6b is also attached.

Next, examples of dental resin materials for producing such various dental moldings will be described.

First, a powdered PET resin was prepared as the thermoplastic polyester resin. The PET resin is a commercially available product obtained by polycondensing terephthalic acid or dimethyl terephthalate with ethylene glycol. In addition, instead of PET resin, other commercially available thermoplastic polyesters such as PBT resin and PEN resin may be used.

Next, the polycaprolactone (PCL) obtained by synthesizing ε-caprolactone [C6H10O2] (“2-oxepanone” homopolymer) and the PET resin having a weight ratio of 15% to the polycaprolactone (PCL) are copolymerized. The copolymerized polycaprolactone was purified. The weight ratios of the obtained copolymer polycaprolactone to the polycaprolactone (PCL) are 0.8% for ascorbic acid, 0.009% for titanium oxide, and red pigments (for example, aluminum lake and red iron oxide, which are legal pigments), respectively. (Select one or more from organic and inorganic pigments such as) 0.003% and zinc stearate 0.018%.

When used for the gingival part of the denture base, specifically, 20% (10 kg) of PET resin, 15% (7.5 kg) of powdered silica, and 0 of ascorbic acid with respect to polycaprolactone (PCL) (50 kg). It is 0.8% (400 g), 0.009% (4.5 g) titanium oxide, 0.003% (1.5 g) red pigment, and 0.018% (9 g) zinc stearate.

Each of the above materials (copolymerized polycaprolactone, ascorbic acid, titanium oxide, red pigment and zinc stearate) is mixed by an extruder, and colored pellet-shaped dental resin material (dental molding that replaces gingiva, etc.) Dental resin material used to manufacture the body) was obtained. Although a very small amount of unavoidable impurities are mixed in these dental resin materials in terms of weight ratio with respect to polycaprolactone, they are not related to the essential requirements and effects of the present invention and do not affect them.

The denture base 1a, crown 2 (crown prosthesis), aesthetic laminate 3 (crown prosthesis), orthodontic appliance 4, and mouthpiece 5 (temporary coating) shown in FIGS. 1 to 8 are made of the purified dental resin material. A dental molded body such as a crown) is molded. When molding such a dental molded body, any of the injection molding method, the compression molding method, the vacuum pressure molding method and the like can be easily processed using a general-purpose molding machine. By chemically binding the denture base 1a and the artificial tooth 1b shown in FIG. 1 using a solvent, food residue invades and stagnates at the boundary between the denture base 1a and the artificial tooth 1b, and germs propagate. Can be suppressed.

When the dental molded product according to the present invention is manufactured by injection molding, for example, a pellet-shaped dental resin material is placed in the barrel of a general-purpose resin molding machine, the furnace temperature is set to 70 to 100 ° C., and the raw material is softened and melted. Injection molding is performed. Since zinc stearate is blended in this dental resin material, the resin fluidity is high, and it is possible to accurately reproduce even the details of the molded product.

Further, the above-mentioned dental resin materials can also be used as the denture base repair material 6a and the denture base stabilizers 6b and 6b, respectively, as shown in FIGS. 9 to 11. In this case, it is not necessary to mold it into a special shape, for example, it may be molded into a quadrangular plate shape or the like, softened at the time of use, and attached to the complete dentures 6 and 7.

The dental molded product and the dental resin material as described above have extremely advantageous features and characteristics as listed below.

1. 1. There is no resin allergic reaction in the human body.
2. 2. Since bisphenol A, which is an endocrine disruptor, does not elute, it is highly safe to use on the human body.
3. 3. For all additives, this resin component is highly safe because it does not elute in the oral cavity, and there is no concern about the safety of additives and pigments.
4. In order to enhance the aesthetic naturalness of the denture base, a polyester fiber body colored in a color imitating a blood vessel in the human oral cavity may be embedded in the molded body.
5. By blending zinc stearate as an additive, the pigments are evenly mixed in all of the resin dyeing, and the dyeability is greatly improved.
6. By blending zinc stearate, the smoothness of the surface of the resin itself is increased and the slipperiness is improved, which is effective for attachment / detachment of the denture base.
7. By blending titanium oxide as an additive, it is possible to reproduce a natural color that matches the human gingiva at the time of dyeing the denture base.
8. According to the dental molded body according to the present invention, mechanical strength, bending strength, and heat resistance are equal to or superior to those of conventionally used dental molding resin materials (polycarbonate, polyamide, nylon, acrylic, etc.). Therefore, the denture base is less likely to break, and it is very compact and it is possible to manufacture a denture base that does not cause discomfort in the oral cavity. Since the water absorption is very low compared to conventional resin materials, germs due to water absorption Propagation and deterioration of resin properties are extremely small.
9. Since the dental molded body or the like according to the present invention does not easily absorb moisture in the air, there is no problem even in a storage state at room temperature, and there is no need to heat-dry to remove moisture even during injection molding. It is also excellent in work efficiency.
10. Since the dental molded body or the like according to the present invention can be softened at a temperature of about 70 to 75 ° C., the shape can be freely changed, and the shape of the mucosal surface, the cervical canal, and the molded tooth can be easily changed. It is possible to adapt to.

An evaluation test was conducted on the dental molded product of the present invention as described above (a dental molded product that substitutes for gingiva and the like), and the results are shown in Table 1.

As shown in Table 1, for example, in the repeated bending test, as a result of measuring before and after water absorption, both of the products of the present invention obtained better results than other dental resin materials (polyamide and polycarbonate excluding polypropylene). It was. For example, in a repeated bending test before water absorption, polycarbonate was broken 5 times and polyamide was broken 120 times, but in the product of the present invention, no crevice or breakage occurred even after 200 times of bending.

Further, in the repeated bending test after water absorption, the polycarbonate was broken at 6 times and the polyamide was broken at 118 times, but in the product of the present invention, there was no crevice at 250 times. Further, in the resin material (molded product) of the present invention, the bending strength was 170 MPa, the elongation was 16 mm or more, and the water absorption rate was 0.1 to 0.4 wt%, and very good values were obtained. In addition, good results were obtained as shown in the attached experimental results such as workability and coloring.

To supplement the coloring test, the "colored ΔE curry" in the second row from the bottom of Table 1 is a sample in which a resin piece as a sample is immersed in hot water in which curry powder is dissolved for one week at 37 ° C. The resin piece was taken out and inspected with a dedicated testing machine to see how much it was colored by the curry powder solution, and the inspection result was quantified. The smaller the value, the lower the degree of coloring, in other words, the less discoloration. Further, "colored ΔE fuchsin" is obtained by performing the same inspection using fuchsin, which is a coloring agent, instead of curry powder, and the smaller the inspection value, the less the discoloration. As is clear from these results, in the product of the present invention, the inspection value of "colored ΔE curry" is 1.2 and the inspection value of "colored ΔE fuchsin" is 5, which is sufficient as compared with the inspection values of polyamide and polycarbonate. It can be seen that it is small and does not easily discolor.

1 Partial denture 1a Denture base 2 Crown (crown prosthesis)
3 Aesthetic laminate (crown prosthesis)
4 Orthodontic appliances 5 Mouthpiece (temporary covering crown)
6,7 Complete denture 6a Denture base repair material 6b Denture base stabilizer

Claims (4)

A dental molded product containing polycaprolactone that has a predetermined shape and is used in the oral cavity.
It has a thermoplastic polyester resin and powdered silica,
With the thermoplastic polyester resin having a weight ratio of 5 to 30% to the polycaprolactone,
With the powdered silica having a weight ratio of 5 to 25% to the polycaprolactone,
Ascorbic acid having a weight ratio of 0.3 to 1.8% to the polycaprolactone,
Titanium oxide having a weight ratio of 0.001 to 0.02% to the polycaprolactone,
A pigment having a weight ratio of 0.001 to 0.1% with respect to the polycaprolactone.
With zinc stearate having a weight ratio of 0.001 to 0.1% to the polycaprolactone,
A dental molded product, characterized in that the balance contains the polycaprolactone and unavoidable impurities. A dental molded product containing polycaprolactone that has a predetermined shape and is used in the oral cavity.
It has a thermoplastic polyester resin and powdered silica,
With the thermoplastic polyester resin having a weight ratio of 10 to 25% to the polycaprolactone,
With the powdered silica having a weight ratio of 5 to 20% to the polycaprolactone,
Ascorbic acid having a weight ratio of 0.3 to 1.8% to the polycaprolactone,
Titanium oxide having a weight ratio of 0.001 to 0.02% to the polycaprolactone,
Pigments with a weight ratio of 0.001 to 0.1% to the polycaprolactone.
Zinc stearate having a weight ratio of 0.001 to 0.1% with respect to the polycaprolactone.
A dental molded product, characterized in that the balance contains the polycaprolactone and unavoidable impurities. A dental resin material containing polycaprolactone, which is used in association with a dental molded product used in the oral cavity.
It has a thermoplastic polyester resin and powdered silica,
With the thermoplastic polyester resin having a weight ratio of 5 to 30% with respect to the polycaprolactone,
With the powdered silica having a weight ratio of 5 to 25% to the polycaprolactone,
A dental resin material, characterized in that the balance contains the polycaprolactone and unavoidable impurities. A dental resin material containing polycaprolactone, which is used in association with a dental molded product used in the oral cavity.
It has a thermoplastic polyester resin and powdered silica,
With the thermoplastic polyester resin having a weight ratio of 10 to 25% to the polycaprolactone,
With the powdered silica having a weight ratio of 5 to 20% to the polycaprolactone,
A dental resin material, characterized in that the balance contains the polycaprolactone and unavoidable impurities.

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