JPS6148354A - Synthetic denture and denture bed to which non-stickiness was imparted - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application ¥f) The present invention relates to synthetic resin dentures and denture bases that have been imparted with non-adhesive properties, and more specifically, synthetic resin dentures and denture bases that are The present invention relates to synthetic resin dentures and denture bases, which are coated with a fluororesin coating agent that forms a hard coating at a temperature that does not cause thermal deformation to form a non-adhesive hard coating.

(Conventional Technique 7BF) Synthetic resin dentures and denture bases are currently widely used because they are easy to manufacture, relatively inexpensive, and have performance that satisfies the function of dentures.

As is well known, the denture and denture base are integrated into a so-called
Their basic function is to form false teeth, which are fixed in the oral cavity and replace missing natural teeth to make it easier to chew food. Dentures are manufactured in a shape that matches the state of missing natural teeth.

Synthetic resins used as materials for dentures and denture bases include polymethyl methacrylate resin (PMMA),
Examples include polycarbonate, polysulfone, etc., but in most cases, PMMA is currently used. Therefore, the case of PMMA will be mainly explained here. More precisely, the A tooth and the material of the denture base “■
is not a simple PMMA, but is a resin made by copolymerizing a small amount of crosslinking materials, etc. However, since the wood of the present invention does not relate to the strict M1 composition of these materials, further explanation will be omitted. Make it.

As an attempt to improve the surface gloss and abrasion resistance of synthetic resin dentures, a method is known in which a cured acrylic coating is applied to the denture surface (Japanese Patent Application Laid-open Nos. 53-13589 and 57-2).
No. 2749). These attempts are aimed at improving the aesthetics and durability of dentures.

(Problems to be Solved by the Invention) A well-known drawback of dentures made of synthetic resin dentures and denture bases is that when eating chewing cams, rice cakes, candy, etc. This can cause the dentures to stick and become dislodged, causing difficulties.

(Means for Solving the Problem) The present inventor completed the present invention as a result of intensive research aimed at improving the above-mentioned drawbacks of synthetic resin dentures and denture bases.

The present invention provides a denture and a denture base body made of synthetic resin,
A fluororesin coating agent that is applied to the surface of the denture and denture base body and forms a hard coating at a temperature at which the body does not substantially undergo thermal deformation, forming a non-adhesive hard coating. The present invention relates to a non-adhesive synthetic resin denture and denture base having the following structure.

It is well known that fluoropolymer-based coatings provide non-stick properties. For example, a frying pan coated with a fluororesin such as tetrafluoroethylene resin prevents food from sticking.

The present inventor focused on the non-adhesive effect of a fluororesin coating agent, and first conducted an experiment to confirm the extent to which this effect is exhibited when applied to dentures. The outline of the experiment is as follows.

Generally, 250° is used for firing fluororesin coatings.
Since the coating agent requires a high temperature of C or higher and generally uses metal as the adherend, dentures made of aluminum alloy were made and used.

A complete denture is made by embedding a denture coated with a fluororesin coating agent into a denture base made of PMMA resin, and this is used to make it easier to chew foods such as chewing gum and rice cakes. The degree of adhesion to the floor was examined. The fluororesin coating agent used is as follows.

(1) Fluororesin fine particle dispersion type A type in which fine fluororesin particles (average particle size 0.1 to 0.4 microns) are dispersed in water or an organic solvent, and the dispersion medium is epoxy, phenol, polyamide, urethane, or acrylic. There is a modified type that uses a pinter resin system such as polyphenylene sulfide and has fine fluororesin particles dispersed therein. Examples of fluororesins include tetrafluoroethylene resin (PTFE), trifluorochloride ethylene resin (PCTFE), tetrafluorodiethylene hexafluoride propylene copolymer resin (FEP), and vinylidene fluoride resin (PV
DF) nato is used.

(2) Solvent-soluble fluororesin type Consists of a copolymerizable fluororesin that can be dissolved in organic solvents. In particular, functional groups such as hydroxide groups are introduced into the fluororesin, and curing agents such as incyanate and melamine A hardening type is known.

The fluororesin coating agents listed below were manufactured by Ichisaka Co., Ltd., and were coated on aluminum alloy dentures to a film thickness of approximately 20 microns using a prescribed method.

As a result of making it easier to masticate chewing gum and rice cake using the dentures manufactured in this way, the following findings were made.

The denture portion coated with the above-mentioned fluororesin coating is non-adhesive, and the degree to which chewing gum sticks to it is extremely low, which is a clear difference compared to conventional synthetic resin dentures. On the other hand, adhesion is observed on the uncoated denture base, and adhesion is particularly noticeable when eating rice cakes. The following conclusions were drawn from these findings.

(1) Food adhesion is prevented by applying a fluororesin coating.

(2) It is necessary to apply coating not only to the denture area but also to the denture base area.

As a fluororesin, a coating agent in which fine particles of a resin such as PTFE or FEP, which has a high fluorine atom density and a low surface energy, are dispersed, provides a particularly high degree of non-adhesion. In this specification, "non-adhesive" means, as described above,
Adhesive refers to the property of food being difficult to adhere to dentures and denture bases.

The above experiments revealed that applying a fluororesin coating to dentures and denture bases can provide effective non-adhesive properties, but the types of fluororesin coatings that can be applied to synthetic resin dentures and denture bases are Significantly limited.

Synthetic resins used for dentures and denture bases have poor heat resistance, and coating agents that require high temperature treatment during coating film formation cannot be used. In the case of PMMA, the temperature limit at which thermal deformation does not occur is considered to be 100°C, which is close to its glass transition temperature.

Therefore, the conditions for the successful application of fluororesin coating agents to synthetic resin dentures and denture bases are:
First, it is necessary to be able to form a hard coating film at a temperature below loo'c.

The second condition is that the coating film has good adhesion to the adherends, which are the denture and the denture base. For this purpose, it is effective to perform surface treatment or primer treatment on the adherend.6 The third condition is that the coating film must have sufficient wear resistance to withstand the chewing action of teeth. .

The present inventor studied fluororesin coating agents from the viewpoint of the above three conditions and found the following fact.

Fluororesin-based coating agents that can form a hard coating film at temperatures that do not substantially cause thermal deformation of synthetic resin dentures and denture bases are necessarily of the so-called modified type, and cannot be combined with binder resin components other than fluororesin. A combined composition. The fluororesin is present in the coating agent either dispersed in the form of fine particles or dissolved in a solution. The hard coating 11 obtained by applying these coating agents generally has fairly good adhesion to the dentures and denture bases, which are the adherends, and has considerable wear resistance, and is suitable for the purpose of the invention. Follow.

Next, preferred examples of the fluororesin coating agent applied to the present invention will be explained.

Many types of coating agents, including those made by Ichisaka, are known in which fluororesin fine particles are dispersed in a base resin system.
Examples of the base resin include crosslinked hardening resins such as phenol resins, epoxy resins, urethane resins, and acrylic resins, as well as lacquer-type thermoplastic resins such as PMMA resins and polycarbonate resins. From the viewpoint of coating film properties and electrodeposition properties, acrylic resins, urethane resins, epoxy resins, etc. are preferable, and modified types of these resins include, for example, acrylic-modified epoxy resins, acrylic-modified urethane resins, and the like.

There are various curing methods for these base resins, including a lacquer type in which the solvent is simply volatilized, and a crosslinking method in which the resin is crosslinked and cured by heat or heating. From these base resins and curing methods, Ff! Quality = A system that can form a nib is selected.

Taking the case of epoxy resin as an example, the curing temperature varies from room temperature to a high temperature close to 200'C depending on the type of curing agent. Generally, if an amine-based curing agent is used, 100"C
Sufficient curability can be obtained at the following temperatures. Many types of urethane resins are known that are room temperature curing. There are various types of silicone resins, ranging from room temperature curing types to relatively low temperature heat curing types. Although this resin has some drawbacks in durability, if a hardened acrylic resin or the like is used as a primer, sufficient wearing resistance can be obtained.

A notable method of low-temperature curing coatings is radiation curing, especially ultraviolet curing. Regarding this ultraviolet curing method, there is a technique disclosed in the above-mentioned publication that aims to improve the gloss and abrasion resistance of Rm.

Regarding its relationship with the present invention, the feature of the present invention, as is already clear, is to provide non-adhesive properties to synthetic resin dentures and denture bases by means of a fluororesin coating. For example, a cured coating film made by irradiating ultraviolet rays on a composition made of a base resin based on a polyfunctional acrylic monomer or oligomer and in which fluororesin fine particles are added and dispersed is expected to improve in terms of gloss. It is difficult to process, and is actually inferior to that which has not been processed in the field. It is a well-known fact that filler content sacrifices the gloss of the coating film.

Recently, solvent-soluble fluororesins have been developed, and solution-type weather-resistant paints based on them have been commercialized.

Examples of solvent-soluble fluororesins include copolymerized fluororesins such as ethylene/tetrafluoroethylene copolymer and propylene/tetrafluorinated ethylene copolymer. A non-adhesive coating film can be formed by using these resins alone or by mixing them with other resins to form a solution, and applying and drying or curing the solution.

A crosslinked curable resin in which a functional group such as a hydroxyl group is introduced into one molecule has been developed as a preferable solvent-soluble fluororesin applicable to the present invention. This type of fluoropolymer is soluble in many of the common general purpose solvents such as esters, ketones, aromatics and alcohols, as well as incyanates,
It can be hardened using a hardening agent such as melamine.

In particular, incyanate curing is performed at room temperature or 100°C.
It is carried out at the following relatively low temperature, and it provides excellent coating film properties and good "=b" properties for plastic adhered objects.
Suitable for the present invention. There are many types of incyanate curing agents, such as hexamethyl diisocyanate, epoxy resin-modified polyisocyanate, polyester-modified polyisocyanate, and acrylic resin-modified polyisocyanate. It is also possible to add fluororesin fine particles to the solvent-soluble fluororesin solution.

The fluororesin coating agent applied to the present invention has been described above using several examples, and can be summarized as follows.

(1) A modified fluororesin coating agent in which fine fluororesin particles are dispersed in a binder resin system, (2) A solution-type modified fluororesin coating agent that combines an organic/organic solvent-soluble fluororesin, (3) ( A modified fluororesin coating agent made by dispersing fluororesin fine particles in the system of 2).

The quantitative composition of the fluororesin contained in these modified fluororesin coating agent compositions is not particularly limited, but when fluororesin fine particles are dispersed, the amount contained in the coating film is usually in the range of 5 to 30% by weight. be. Further, the particle size of the fine particles is usually 0.2 to 1 micron.

Note that the fluororesin coating agent applied to the present invention is not limited to the above examples, and there are many more possible examples.

ynl applies a fluororesin coating agent to synthetic resin dentures and denture bases and dries or hardens the coating.
The appearance differs depending on the type of coating agent used.

The thickness of the coating film is usually 5 to 30 microns.

(Examples) Hereinafter, the present invention will be further explained with reference to Examples, but the present invention is not limited by these Examples.

Example 1 50 parts of 1.6-hexanediol diacrylate, 40 parts of diethylene glycol dimethacrylate) and 10 parts of epoxy acrylate (Osaka Organic Chemical Industry Co., Ltd.) were mixed, and to this were added 4 parts of benzoin isopropyl ether as a photosensitizer and A photocurable coating composition was prepared by adding 1 part of benzoyl peroxide as a polymerization initiator and accelerator. Finely divided fluororesin (PTFE) was added to 10 parts of this composition.
22 parts were added and uniformly mixed and dispersed in a mortar. Furthermore, 8 parts of ethyl acetate was added to adjust the viscosity of the dispersion to: A.

Next, use a brush to uniformly apply the above coating dispersion to the outer surface (the surface that comes into contact with food in the oral cavity) of the complete denture body consisting of the PMMA resin denture and denture base, and leave it at room temperature to remove the solvent. After volatilization, it was placed on a rotating support stand and heated with a high-pressure mercury lamp (200W) in a nitrogen gas atmosphere for 4 hours.
A cured coating film was obtained by irradiation for a minute. The hardness of the coating film (pencil hardness)
3H, and the film thickness was 15 microns. Also, separately PMMA
The coating liquid was applied to a board, and the adhesion (cross-cut test using cellophane tape) of a sample treated in the same manner was measured and found to be 100/100.

When the thus-obtained so-iriyama was attached to make it easier to masticate chewing gum or rice cakes, it was found that adhesion of these foods was significantly prevented compared to untreated ones.

Example 2 A complete denture body made of the same PM/MA resin as in Example 1 was used. As a modified fluororesin coating agent made by dispersing fluororesin fine particles in a base resin composition, Acheson Co., Ltd.
Emlaron 320 (Em
ralon 320) C base resin: thermoplastic resin) was used. The coating treatment was carried out in the same manner as in Example 1. This coating agent is a two-component type, and the specified firing conditions for the coating film are 80'C x 30 minutes.

When the same experiment as in Example 1 was conducted using dentures coated with fluororesin, it was found that food adhesion was significantly prevented.

Example 3 As a modified fluororesin coating agent, Acheson 6 Colloids Company Noemuralon 314 (base resin:
The same procedure as in Example 2 was carried out using epoxy resin). This coating agent is a two-component type, and the firing temperature of the coating film is room temperature, but it was cured at a temperature of 60° C. for 5 hours.

When a chewing test was conducted in the same manner as in Example 2, it was confirmed that sticking of chewing gum, rice cake, etc. was significantly prevented.

Example 4 The fluororesin coating agent used was New Kamets h#2000 manufactured by Toa Paint.

This is a two-component coating agent that is presumed to be a combination of a soluble fluorine co-polymer resin having a hydroxyl group in its molecule and an incyanate curing agent component.

A chewability test was conducted using coated dentures in the same manner as in the above example. The adhesion of foods such as chewing gum and rice cakes is significantly prevented compared to untreated products, but
The non-adhesive property is slightly inferior to that of Example 1. On the other hand, the gloss of coating No. 11 is superior to those of Examples 1 to 3.

(Effects) As described above, according to the present invention, it is possible to effectively prevent food from adhering to dentures and denture bases. Furthermore,
The denture and denture base of the present invention can substantially prevent thermal deformation of the denture and denture base main body, and can also improve the adhesion of the coating film to the main body, so that the denture and denture base can remain in good condition for a long period of time. can be used.

Claims (6)

[Claims] (1) A denture and denture base body made of synthetic resin, and a fluororesin coating agent that is applied to the surfaces of the denture and denture base body and forms a hard coating film at a temperature at which the body does not substantially undergo thermal deformation. A synthetic resin denture and denture base provided with non-adhesion by forming a non-adhesive hard coating film. (2) The synthetic resin denture according to claim 1, wherein the fluororesin coating agent is a modified fluororesin coating agent in which fluororesin fine particles are dispersed in a binder resin system; denture base. (3) The synthetic resin denture according to claim 1, wherein the fluororesin coating agent is a solution-type modified fluororesin coating agent containing an organic solvent-soluble fluororesin; denture base. (4) The fluororesin coating agent is a modified fluororesin coating agent obtained by dispersing fluororesin fine particles in a solution-type modified fluororesin containing an organic solvent-soluble fluororesin. Synthetic resin dentures and denture bases according to scope 1. (5) The number of fluororesin fine particles contained in the coating film is 5 to 3.
The synthetic resin denture and denture base according to claim 1, 2, 3, or 4, characterized in that the content is 0% by weight. (6) The synthetic resin denture and denture base according to claim 5, wherein the fluororesin fine particles have a particle size of 0.1 to 1 micron.