KR20170120787A - Denture base and mold, and dental resin material - Google Patents

Abstract

The present invention is to provide dental molded parts, such as a denture base, a temporary crown, a pontic, and an orthodontic device, which do not release bisphenol A and the like, nor cause resin-related allergic reactions in a human body, and thus have excellent safety; and a dental resin material for molding the molded parts. To this end, the present invention provides dental molded parts used inside an oral cavity while having a predetermined form, or a dental resin material for forming dental molded parts, wherein the dental resin material contains, as a main component, a copolymerized polypropylene resin material comprising in a weight ratio: 65-90% of polypropylene; 7-25% of polyethylene or ethylene--olefin copolymer; 0.01-2% of magnesium stearate; 0.001-1% of either or both of titanium oxide and iron oxide; and 0.0001-1% of a pigment.

Description

[0001] DENTAL BASE AND MOLD, AND DENTAL RESIN MATERIAL [0002]

TECHNICAL FIELD [0001] The present invention relates to a dental molding body and a dental resin material ([0001] plastic resin material).

Denture base, denture base, temporary crown, artificial tooth, and dental orthodontic appliance (orthodontic appliance, dental prosthesis) Instruments) are known. As a typical denture base of the denture, acryl resin or polycarbonate resin has been conventionally used as the resin material. As the acrylic resin, there are drawbacks such as high water-solubility and easy propagation of germs. In the case of the polycarbonate resin, there is a possibility that elution of bisphenol-A, which is an endocrine disruptor, is caused.

Patent Document 1 discloses an example in which polypropylene or polyethylene is used as a tenter base or a dental image (part of the base of a denture base). However, since it is vulnerable to impact and is easily broken, It is not coming.

Disclosure of the Invention The present invention is to provide a dental molding having a bending strength capable of withstanding use and a rigidity suitable for a human body and being different from the conventional acrylic resin or polycarbonate resin and being resistant to propagation of resin allergy ), And further, there is no elution of bisphenol A and the like, so that the dental molding and dental resin material excellent in safety are provided.

In order to solve such a problem, the present invention is a dental resin material for use in manufacturing a dental molding or dental molding which is used in an oral cavity and has a predetermined shape, wherein the composition is composed of 65 to 90% of polypropylene, Or a copolymerized polypropylene resin material containing 7 to 25% of an ethylene-α-olefin copolymer, 0.01 to 2% of magnesium stearate, 0.001 to 1% of one or both of titanium oxide and iron oxide, and 0.0001 to 1% . Herein, the term " main component " refers to a component having a content of 90% or more. The following " main component "

Further, the present invention is a more preferable invention of a dental resin material for producing a dental molding or dental molding which is used in the oral cavity and has a predetermined shape, wherein the composition is composed of 75 to 85% of polypropylene, Or a copolymer polypropylene resin material containing 15 to 20% of an ethylene alpha-olefin copolymer, 0.03 to 0.5% of magnesium stearate, 0.003 to 0.1% of one or both of titanium oxide and iron oxide, and 0.001 to 0.1% .

Examples of the dental molding formed by the dental molding of the present invention and the dental resin of the present invention include a denture base of a denture, a temporary crown, an artificial tooth, a dental correction mechanism, and the like. The denture base is generally colored pink to correspond to the color of the gums, and has a denture base of total denture and a denture base of a partial denture, and supports the artificial teeth and functions as a mounting portion in the oral cavity. More specifically, the use of a wire denture (non-clasp denture), which does not fundamentally use a wire (also called an intraoral support clasp) or a metal, A denture base of a partial denture having a denture base in which a wire base or a wire clasp exists, and a denture base of a complete denture.

The temporary crown is not used for a long period of time, but after a certain period of time (temporarily), for example, a mouthpiece, a value for temporarily mounting after extraction, Cladding cladding to cover until stabilized. Artificial teeth include dentures, which are integrated with the denture base, and are directly implanted in the oral cavity. The dental orthodontic appliance is mounted in the oral cavity for, for example, correcting the upper and lower jaws, correcting the dentition, correcting the teeth, and correcting the angle of the teeth.

[0010] In such a dental molding, a denture base is generally colored (dyed) in pink according to the color of the gums. For coloring the denture base, a red pigment (red pigment) is used, and a white additive As a white-based additive, titanium oxide may be used. Alternatively, iron oxide may be added as an additive of a moderate color to a red color pigment to give a natural color close to the color of the actual gums. That is, titanium oxide or

One of the functions of the iron oxide is to perform red coloring corresponding to the gums as in the red color pigment.

In the case of an artificial tooth, it is usual to color a color intermediate between yellow and white. In this case, a yellow pigment is used, and white titanium oxide is added to the tooth, Quot; white < / RTI > white " In the case of a temporary crown or a correcting device, it is not always necessary to color with the red color corresponding to the color of the gum. However, in the case where there is a purpose of making the existence of the temporary crown or the correction mechanism inconspicuous, Coloring can be performed. When the temporary crown or the correcting mechanism is not made to correspond to the color of the gums, a pigment of a desired color may be used together with titanium oxide or iron oxide to give a suitable color.

As the form of the resin material for manufacturing (typically injection molding) the dental molding as described above, it is possible to adopt various forms suitable for melting and molding the resin material including the pellet shape, the sheet shape, and the block shape have.

The composition of the dental molding material and dental resin material of the present invention will be described. When the proportion of polypropylene is less than 65%, separation breakage tends to occur. When the percentage of polypropylene is more than 90% The problem of incompatibility with the oral cavity occurs, so that the content of polypropylene is 65 to 90%. Next, if the content of the polyethylene or ethylene? -Olefin copolymer is less than 7%, peeling failure will occur as in the case of polypropylene

If it is more than 25%, on the other hand, as in the case of polypropylene, there is a problem of incompatibility with the oral cavity due to expansion of the resin, so that the polyethylene or ethylene alpha-olefin copolymer needs to be in the range of 7 to 25%.

In addition, magnesium stearate improves the agglomeration and mixing properties (agitability and mixing property) of the pigment, titanium oxide (or iron oxide) and resins, and when it is less than 0.01%, the effect (improvement in the degree of agglomeration and mixing Effect) is not expected. On the other hand, if it exceeds 2%, stirring or mixing itself becomes difficult, so it is necessary to add it in the range of 0.01 to 2%.

As used herein, the term " dyeability " refers to dyeability in the sense that, for example, in the case of a molded article used for a denture base, the resin is dyed pink so as to be close to the color of gums and the like in the mouth. The pigment and the titanium oxide (or iron oxide) are added for coloring (coloring). For example, in order to make the color (pink) close to the actual gums appear, the mixing ratio of the red color pigment and the titanium oxide (white color) is adjusted. If the ratio of titanium oxide is increased, the pinkish red light can be suppressed so that the white color becomes strong pink color, and if the ratio of titanium oxide is reduced, the red color becomes strong pink color. In addition, iron oxide is added to, for example, a red pigment to decrease the saturation or brightness of the clear red color so that it becomes close to the natural color of the gums, and both titanium oxide and iron oxide are added to a predetermined pigment to dye the resin into a desired color It is possible.

The content of titanium oxide (or iron oxide) is determined mainly by how to dye the pigment in relation to the pigment. The magnesium stearate has such a property that the pigment and the titanium oxide (iron oxide) are uniformly mixed with the resin material, It is possible to contribute to uniform dyeing which produces very uniform color.

If the weight ratio of one or both of titanium oxide and iron oxide is less than 0.001%, the role of color tone definition for the pigment can not be attained. On the other hand, if the content exceeds 1%, the color tone definition function is lost and the strength of the resin material It is set in the range of 0.001 to 1% in order to inhibit physical properties.

With respect to the composition of the pigment, if the weight ratio is less than 0.0001%, the dyeing effect can not be obtained. On the other hand, if it exceeds 1%, the desired dyeing property is impaired and the physical properties of the resin material are not preferable. Therefore, the blending ratio of the pigment is preferably 0.0001 to 1 %.

In the invention of the above dental molding or dental resin material having a more preferable composition, by setting the ratio of the polypropylene to 75 to 85% by weight and the polyethylene or the ethylene? -Olefin copolymer to 15 to 20% And the expansion of the resin can also be suppressed, so that the dimensional fitness and fitting suitability of the dental molding within the oral cavity are improved. In the case where the content of magnesium stearate is 0.03 to 0.5%, the content of one or both of titanium oxide and iron oxide is 0.003 to 0.1%, and the content of the pigment is 0.001 to 0.1%, the pigment, titanium oxide (iron oxide) It is possible to obtain a dental molding or a resin material for dental use by mixing the magnesium stearate with the above-mentioned stearic acid resin or a dental resin material by setting the blending amount of one or both of titanium oxide and iron oxide and the blending amount of the pigment as described above. And a better coloring and dyeing effect can be imparted.

The bending strength of the denture base and the expansion ratio at the time of cooling after the injection molding of the resin material can be suppressed to enable precise fitting in the oral cavity, .

From the viewpoint of the physical properties of the dental molding or the dental resin material, the specific bending strength possessed by the present invention can not be obtained. White folding marks are likely to appear, resulting in the breakage of the denture base, resulting in a very fragile characteristic that does not fit the human body, and even after the injection molding, the expansion rate is increased, resulting in a situation in which it can not be mounted precisely in the oral cavity.

The effect of addition of magnesium stearate and titanium oxide (iron oxide) as additives is also added. When these additives are added, pigments suitable for the tenter base body can be dyed, the fluidity of the resin during injection molding is increased, Reproducibility (degree of fine molding reproduction) is improved. Further, in the case of using the dental molding according to the present invention and attempting to attach and detach the denture base in the oral cavity as a denture base,

The result of reducing the resistance due to the friction between the residual tissue and the tooth by the above-mentioned additive to improve the sliding property. Therefore, when the patient is used, it can be easily mounted or removed as compared with, for example, other dental base or the like (detachable resin material). Further, according to the dental molding of the present invention, since the absorbability (water absorption) is very low, the propagation of the germs can be suppressed, the durability is high because of the high strength, Sanitary and pleasantly, the denture base can be used over a long period of time.

When the dental molding material is produced by using the dental resin material of the present invention, the resin material is melted and a predetermined dental molding is generally formed by injection molding. As a result, a dental molding such as a denture base, a temporary crown, an artificial tooth, and a dental orthodontic appliance, which has no resin allergy to the human body and has no elution of bisphenol A and the like and is excellent in safety as described above, can be obtained.

It is included in the detailed contents for carrying out the invention.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a portion of an example of a dental molding according to the present invention; Fig.
Fig. 2 is a view showing an example in which the denture of Fig. 1 is mounted in a human oral cavity. Fig.
3 is a view showing a calibration mechanism as an example of the occlusion alignment apparatus.
Fig. 4 is a view showing an example in which the calibration mechanism of Fig. 3 is mounted in a human oral cavity. Fig.
5 is a view showing an example of an artificial tooth as an example of the dental molding of the present invention.
6 is a view showing a mouthpiece which is an example of a temporary crown.

1 shows a dental base 1a (1b is an artificial tooth) of a partial dental prosthesis 1, which is an example of a dental molding of the present invention, Fig. 2 is a partial denture base 1 ) In the oral cavity of a person. Fig. 3 shows an example of a dental orthodontic appliance (an orthodontic appliance) 2, which is an example of a dental orthodontic appliance, and Fig. 4 shows an example in which the dental orthodontic appliance 2 is installed in a human oral cavity. 5 shows an example of an artificial tooth 3, Fig. 6 shows an example of a temporary crown, Fig.

And the mouthpiece 4. Next, examples of the material composition of these various dental molding objects, that is, the resin material for producing the dental molding object, will be described.

A polypropylene obtained by purifying (purified) the dental resin material by copolymerizing (copolymerizing) 80% of polypropylene as a main component and 18% of an ethylene? -Olefin copolymer at a weight ratio (weight ratio). For this polypropylene, 80% by weight of a polypropylene homopolymer [CH2-CH (CH3)] m, and 80% by weight of ethyl

(CH3)] m- [CH2-CH2] n was used in an amount of 18%, and 0.1% , And the pigment (pigment) is 0.03%. Here, the pigment may be, for example, an aluminum lake or a bengala (red iron oxide, red iron oxide, or red iron oxide based on iron oxide), which is a statutory coloring matter red, colcothar, rouge), organic pigments or inorganic pigments, or a plurality of pigments may be selected and combined. Alternatively, titanium oxide may be replaced by the same amount of iron oxide, or titanium oxide and iron oxide may be added in a total amount of 0.03%. As the ethylene? -Olefin copolymer, for example, an ethylene butene copolymer may be used in addition to the ethylene propylene copolymer, and polyethylene may be contained in an amount of, for example, 18% instead of the ethylene? -Olefin copolymer.

In addition, the substances other than the above are contained as unavoidable impurities (unavoidable impurities; impurities that can not be avoided in the manufacturing process) in the range of 2% or less, or as additives for a predetermined purpose or as unavoidable impurities and predetermined additives. They may be disregarded because they are not related to the essential requirements and effects of the invention and do not affect them.

Then, the above-mentioned propylene homopolymer, ethylenepropylene copolymer, magnesium stearate, titanium oxide (iron oxide) and pigment are mixed and refined to obtain a dental resin material.

When the dental base material, the dental correction device, the artificial teeth, the temporary crown, etc. shown in Figs. 1 to 6 are molded by such a dental resin material, the injection molding method (injection molding method), the compression molding method And a vacuum press-molding method, it is possible to easily process them using a general-purpose molding machine.

In the case of producing the dental molding according to the present invention by injection molding, the dental resin material of the present invention is generally prepared by placing a pellet-shaped raw material into a barrel of a universal resin molding machine and heating the furnace at a temperature of 180 To 230 ° C to soften and dissolve the raw material to perform injection molding. In the present invention, since magnesium stearate is added as an additive, the fluidity of the resin is high,

Precise reproduction is possible.

The dental molding thus obtained has features and characteristics which are extremely advantageous as compared with the conventional products, as described below.

1. There is no resin allergic reaction in human body.

2. Endocrine disruptor Because there is no elution of bisphenol A, which is an acting substance, it is safe even in human body.

3. With respect to all additives, the resin component has high safety because there is no elution in the oral cavity, and there is no fear of safety in terms of additives and pigments (the melting point of the dental molding resin material of the present invention is, for example, 180 degrees).

4. In order to enhance the aesthetic natural feeling of the denture base, a polyester fiber body colored with a color that mimics blood vessels in a human oral cavity may be buried in the molded body.

5. By adding magnesium stearate as an additive, the pigment can be completely mixed in the dyeing of the resin, and the dyeability is greatly increased.

6. By adding magnesium stearate, the degree of lubricity of the surface of the resin itself is increased, and slip is improved, which is effective for desorption of the tenter base body.

7. By mixing titanium oxide (iron oxide) as an additive, it is possible to reproduce a natural hue that matches the gums of a human body when dyed base is dyed.

8. The dental molding according to the present invention is excellent in mechanical strength, bending strength and heat resistance as compared with conventional dental molding resin materials (polycarbonate, polyethylene terephthalate (PET), acrylic, etc.) Therefore, it is possible to manufacture a denture base having no discomfort in the oral cavity due to the difficulty of fracture of the denture base, and the denture base is very small. Also, since the water absorbency is very low as compared with the conventional resin material,

The propagation of bacteria and deterioration of the physical properties of the resin (physical property deterioration) are extremely small.

9. Further, since the dental molding resin material of the above composition is lighter in weight than the other resin, the burden on the oral cavity tissue is small, for example, in use as a dental base.

10. Since the dental molding resin material of the present invention hardly absorbs moisture in the air compared with the conventional resin material, there is no problem even in a storage state at room temperature. In order to remove moisture even during injection molding Since it is not necessary to heat dry, it is also excellent in working efficiency.

11. The dental molding resin material of the present invention is generally in the form of a pellet, but the present invention is not limited to this, and may be a sheet shape or the like.

In the repeated bending test after the absorption, the polycarbonate was broken at 6 times, the PET + polyethylene was broken at 12 times, broke at 51 times, the polyamide was broken at 53 times and broke at 118 times, There were no cracks in the 200th time, as the bent parts were only whitened. Further, in the resin material (molded article) of the present invention, the flexural strength is 61.2 MPa, the elongation percentage (elongation percentage, for example,

12 mm or more, an absorption rate of 0.13 wt%, and a dissolution rate of 0.1 wt%. The resin material of the present invention was produced by injection molding with a sheet material having a size of 20 mm x 20 mm x 3 mm and then boiled water 100 ° C) for 1 hour, and the appearance of the molded article was checked. As a result, the surface became rough and white, which did not become whitish, did not appear. Accordingly, the same results are obtained in the dental base, temporary crown, dental correction apparatus, artificial tooth, etc. manufactured using the material of the present invention.

1 denture
1a dutch base
1b artificial teeth
2 Dental orthodontic appliance
3 artificial teeth
4 mouthpiece (temporary crown)

Claims (5)

A molded article for dental use which is used in an oral cavity and has a predetermined shape, wherein the molded article has a weight ratio of 65 to 90% of polypropylene, polyethylene or ethylene? 7 to 25% of an ethylene-alpha-olefin copolymer, 0.01 of stearic acid magnesium
(Copolymerized polypropylene resin material) containing 0.001 to 1% of one or both of titanium oxide and iron oxide and 0.0001 to 1% of pigment Wherein the dental implant is made of a main component. A dental molding used in an oral cavity and having a predetermined shape, wherein the molded article contains 75 to 85% by weight of polypropylene, 15 to 20% by weight of polyethylene or an ethylene? -Olefin copolymer, 0.03 to 0.5% by weight of magnesium stearate, Wherein the main component is a copolymerized polypropylene resin material containing 0.003 to 0.1% of one or both of the above and 0.001 to 0.1% of a pigment. 3. The method according to claim 1 or 2,
Wherein the dental molding comprises any one of a dental base, a temporary crown, an artificial tooth, and a dental orthodontic appliance. A resin material for use in producing a dental molding used in oral cavity, which comprises 65 to 90% by weight of polypropylene, 7 to 25% by weight of polyethylene or an ethylene? -Olefin copolymer, 0.01 to 2% by weight of magnesium stearate, Wherein the main ingredient is a copolymerized polypropylene resin material containing 0.001 to 1% of one or both of iron oxide and 0.0001 to 1% of pigment. A resin material for use in manufacturing a dental molding used in oral cavity, comprising 75 to 85% by weight of polypropylene, 15 to 20% by weight of polyethylene or ethylene? -Olefin copolymer, 0.03 to 0.5% by weight of magnesium stearate, Wherein the main ingredient is a copolymerized polypropylene resin material containing 0.003 to 0.1% of one or both of iron oxide and 0.001 to 0.1% of pigment.

Images