JP2002119523A - Soft lining material for dental plate and method of liming dental plate using this lining material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soft lining material for a dental plate designed to relieve the pain in occlusion that occurs in a patient mounted with a complete denture thin in the alveolar ridge membrane and a method of mounting the denture plate using this lining material. SOLUTION: This lining material consists of a liquid agent which consists of a radical polymerizable methacrylate, a plasticizer and a radical polymerization accelerator as essential components or a powder agent which consists of a methacrylate polymer or copolymer and a radical polymerization initiator as essential components. Further, the radical polymerization initiator is compounded with at least either of the liquid agent or the powder agent described above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soft lining material for denture bases and a lining material for the purpose of relieving pain at the time of occlusion occurring in a denture wearing patient having a thin ridge mucosa. The present invention relates to a method for lining a denture base.

[0002]

2. Description of the Related Art In general, in denture patients whose ridge mucous membrane has become thin due to aging, even if a denture with good compatibility with the oral mucosa is worn, the thin mucous membrane with poor cushioning action has a hard denture base. May cause pain when biting.

[0003] In the case of such patients, the pain at the time of occlusion often does not go away for the reasons described above, even if the adaptability is usually improved by using a hard lining material.
For such patients, it is considered effective to line the mucous surface of the denture base with a soft material and substitute the lost mucous membrane.

As a soft lining material for a denture base for the purpose of relieving pain at the time of occlusion, silicone-based and acrylic-based materials are mainly used, each of which has advantages and disadvantages and is still a satisfactory material. Has not been obtained.

That is, as a silicone-based soft lining material for a denture base, an addition polymerization type room temperature polymerization type silicone is mainly used. This material is mixed with two types of pastes, a base and a catalyst, at the time of use, and the mixture is applied to the mucosal surface of the denture base, and the lining is cured by mounting in the oral cavity of a patient.

[0006] In this case, since the mixing of the two types of pastes is usually performed by automatic kneading using a dispenser, it is said that a relatively uniform material can be obtained without bubbles as in hand kneading.

However, silicone-based materials do not essentially adhere to acrylic-based denture base materials, and although various adhesives have been developed, sufficient adhesive strength is obtained in terms of durability. However, it has been pointed out that peeling occurs at the edge of the denture base during use.

[0008] Further, the silicone-based material is "sparse" in molecular structure, so that dirt and the like are easily attached thereto.
There is also a problem that bacteria enter the material and degrade the material.

Further, since it is essentially impossible to grind the cut surface to make it smooth, the stain on the cut surface and the adhesion of bacteria increase.

In addition, since a silicone-based material does not adhere to each other when a new material is added on top of a cured material, it is substantially impossible to partially remove and re-correct the backing surface. This is a major clinical drawback.

On the other hand, the acrylic soft lining material for denture base is of the same type of material as the denture base material, so that it has good adhesiveness to the denture base, and also has a hardened lining material. It is also a big feature that it can be partially added and modified because of its strong adhesion.

[0012] The acrylic soft lining material is formed by mixing a powder consisting of a polymer or a copolymer of methacrylic acid ester and a liquid consisting of a plasticizer and an alcohol at the time of use to form a gel, that is, to form a stick. And a mixture of a powder of a methacrylic acid ester polymer or copolymer and a polymerization initiator, and a liquid of a methacrylic acid ester, a plasticizer, and a polymerization accelerator, and polymerized and cured at room temperature.

All of these materials are intended to obtain a soft material by swelling and plasticizing a methacrylate polymer powder with a plasticizer. However, simply mixing the polymer powder and the plasticizer does not perform efficient plasticization, and thus each is devised.

That is, the above-mentioned gelling type is characterized in that a low molecular weight alcohol is allowed to coexist with a plasticizer,
The alcohol increases the intermolecular distance of the polymer, thereby making it easier for the plasticizer to penetrate into the polymer molecules and shortening the plasticizing time of the material.

As described above, alcohol is an essential component of this type of material, but the alcohol gradually elutes when used in the oral cavity, and thus has a problem that the material gradually hardens and deteriorates. . In addition, since there are many air bubbles at the time of mixing, the surface is significantly stained, and therefore, its use is limited to temporary use such as preparation of mucous membrane.

On the other hand, the room-temperature-curable acrylic material uses a low-molecular-weight radical polymerization reactive monomer instead of the above-mentioned alcohol. This monomer, like alcohol, not only promotes the plasticizing action of the plasticizer, but also acts to plasticize the polymer powder. In this case, most of the monomers in the material are polymerized at room temperature and polymerized, so that they hardly elute during use like alcohol, and as a result, hardening and deterioration due to elution are reduced. Therefore, the present material can be used for a relatively long-term use such as a lining material.

As a method of lining this room temperature-curable acrylic soft lining material on the mucosal surface of the denture base, a denture base in which a fluid material is put on the mucosal surface is directly mounted in the oral cavity of the patient and cured as it is. There are a direct method to make it work and an indirect method to make a lining work by a technical operation.

Although the direct method is simple and has the advantage that it can be carried out on the chair side, the curing is carried out in the patient's mouth, so that the burden on the patient is large, and it is difficult to line it to a certain thickness. There is a risk that the occlusal relationship may be deviated.

Further, since the process is performed under almost no pressure, a large number of bubbles embedded during the lining operation are not crushed, remain in the material, and the material is inferior in denseness.

Further, the material immediately after curing has a relatively low degree of polymerization, so that the surface becomes sticky and has a considerably high viscosity. For this reason, it is extremely difficult to remove the surplus material at the edge of the floor, and since it is virtually impossible to grind, the cut surface is likely to be rough, so that dirt and bacteria tend to adhere.

On the other hand, as an indirect method, a method is generally used in which a denture base is attached to a lining jig together with an occlusal surface core, and the denture base mucosal surface is filled with a fluid powder-liquid mixture, and then the jig is closed. is there. This method has the advantages that the occlusal relationship is less likely to be out of order and that a relatively uniform backing surface can be obtained.

However, also in this case, since the fluid material is filled in a free state, the molding pressure is not sufficiently applied,
Therefore, as in the case of the direct method, the bubbles embedded in the material are not crushed, and a dense material cannot be obtained. Further, since the material overflows from the periphery of the denture base in a free state, it is necessary to treat the surplus material, and the treatment becomes extremely difficult as in the case of the direct method.

As described above, many problems remain in the indirect method using a jig, but as a solution to such a problem, as in the case of forming a denture base, a gypsum mold is used. A molding method for press-fitting the plasticized elastic material has also been put to practical use.

In this method, a sufficient pressure is applied at the time of molding, so that the bubbles inside the material are completely crushed, and the material becomes extremely dense. In addition, in the case of molding, since the edge portion of the denture base is also accurately formed, it is not necessary to delete an excess portion.

However, this method can be applied only to
Limited to heat-curable materials. In this case, the powder-liquid mixture does not polymerize and harden at room temperature, and the material is deformed only by physical plasticization of the low molecular weight monomer. For this reason, the material that has been deformed at room temperature can maintain the deformed state for a relatively long time, and can be pressurized and filled into a mold.

However, since the stickiness is obtained only by physical plasticization of the monomer, a large amount of a monomer having high solubility such as methyl methacrylate and having a relatively hardened material after curing must be used. Therefore, only a relatively hard cured product can be obtained.

In the case of a heat-curable material, since the material is not cured at normal temperature, the molded product must be heated at a high temperature in order to cure the material, which requires a great deal of time and labor. In addition, heating is usually performed at a high temperature of 100 ° C., but the thermal deformation temperature of the denture base material as the main body is generally lower than 100 ° C. Therefore, the denture base may be deformed at the time of heating, and the occlusal relationship may be deviated. There is a concern that this may occur.

As described above, although the molding method by pressurized filling has many advantages, its application is limited to a heat-curable material. It is virtually impossible to adopt. This is because, in the case of the present material, it is extremely difficult to obtain a plastic material necessary for the filling operation, a so-called sticky material.

The sticky material necessary for the filling operation here can be taken out of the container in a lump after mixing the powder and liquid, shows sufficient plasticity, and when pressed with a polyethylene film, It refers to a film in which the material does not stick to the film and peels cleanly.

In the case of a conventional cold-setting acrylic lining material, sufficient fluidity is exhibited immediately after mixing the powder and liquid, but the viscosity gradually increases with the start of the polymerization reaction, and the fluidity eventually disappears. , Plasticity is imparted. However, as the polymerization reaction progresses, plasticity is lost in a relatively short time, and elasticity appears in a few minutes. Therefore, unlike a heat-polymerizable material, it is impossible to maintain the plastic state to the extent necessary for the molding operation.

That is, when molding by the pressure filling method, it is usually necessary to repeat the test pressure and deburring several times, so that this plastic state must be maintained for at least about 5 minutes, preferably about 10 minutes. .

However, in the case of a normal room temperature polymerization type acrylic lining material, this plastic region is very short, and elasticity appears within a few minutes, so that sufficient molding cannot be performed. This elastic material has a high viscosity and lacks fluidity, which makes it extremely difficult to fill the mold, thereby increasing the thickness of burrs and affecting the bite height. Moreover, since plasticity is remarkably reduced, accurate shaping cannot be performed.

The time for maintaining the plasticity can be lengthened to some extent by lowering the polymerization reactivity of the material at ordinary temperature and by increasing the amount of the plasticizer to be added. However, if the reactivity at room temperature is slowed down, the time required for the mochi-forming becomes longer accordingly, and the workability becomes very poor. Further, since the reactivity decreases, a considerable time is required to complete the polymerization reaction at room temperature, and the working efficiency is significantly reduced. In addition, when the amount of the plasticizer to be added is increased, the same phenomenon occurs because the reactivity at room temperature decreases.

[0034]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional room temperature-curable acrylic soft lining material. Developed a polymerized acrylic soft lining material, and completed the polymerization reaction in a short period of time without using a means of heating to obtain a dense, bubble-free, smooth backing surface for denture base. An object of the present invention is to provide a lining material and a method of lining a denture base using the lining material.

[0035]

In order to achieve the above object, the present invention is directed to a liquid polymer containing a radically polymerizable methacrylate, a plasticizer, a radical polymerization accelerator as essential components, and methacrylic acid. A soft lining for a denture base, comprising an ester polymer or a copolymer, a powder containing a radical polymerization initiator as an essential component, and further comprising a photopolymerization initiator added to either the liquid or the powder. Material.

Next, the second aspect of the present invention is directed to the first aspect.
The amount of the plasticizer to be added to the liquid described in the description is 6% of the whole liquid.
2. The composition according to claim 1, wherein the content is in the range of 5 to 95% by weight.
It is a soft lining material for denture bases as described in the above.

According to a third aspect of the present invention, the mixture of the liquid agent and the powdery agent according to the first aspect undergoes a radical polymerization reaction at room temperature to change from a fluid state to a plastic state, The state is maintained at normal temperature for at least 5 minutes or more.
It is a soft lining material for denture bases as described in the above.

Further, the invention described in claim 4 is the same as the claim 1.
In the soft denture base lining material described, the photopolymerization reaction occurs by irradiating the material in the plastic state with visible light,
4. The soft lining material for a denture base according to claim 1, wherein the soft lining material changes from a plastic state to a viscoelastic state.

Next, a fifth aspect of the present invention is directed to the first aspect.
The mixture of the liquid agent and the powder agent described was changed into a plastic state by a polymerization reaction at room temperature, and the material in the plastic state was press-filled into the mucosal surface portion of the denture base embedded in the gypsum mold and molded. Later, remove the denture base from the plaster mold,
A method of lining a denture base, characterized in that a molded article in a plastic state is changed to a viscoelastic state by irradiating the material with visible light.

The room temperature-curable acrylic soft denture base material of the present invention having the above-described structure is used for plasticizing and elasticizing the powder-liquid mixture by temporary curing by chemical polymerization. The plastic material is changed into a viscoelastic material by secondary curing by light irradiation.

Since the mochi-formation is carried out by a polymerization reaction at room temperature, the time required for the mochi-formation can be greatly shortened. Due to the plasticizing effect of the plasticizer blended in a predetermined amount, it is possible to maintain the plasticity for at least 5 minutes or more, whereby the cold-setting acrylic type soft lining material, which has been considered impossible in the past, is pressurized. Molding by the method becomes possible.

Further, after molding, the polymerization reaction can be completed in a short time by photopolymerization, and the state can be changed from a plastic state to a viscoelastic state. Thus, it is not necessary to perform the heat treatment for a long time.

The soft lining material for a denture base of the present invention is
Since the waxy state is formed by the room temperature polymerization reaction, and its plastic state is maintained at room temperature for at least 5 minutes,
Despite being a room temperature polymerization type, it is possible to mold by a pressure filling method.

Further, the material after room temperature polymerization undergoes a photopolymerization reaction by light irradiation and changes to a viscoelastic state in the final polymerization stage, so that it is not necessary to take a means of heating.

Therefore, when the denture base is lining using the soft lining material for a denture base of the present invention, the working time is greatly reduced and the problem of denture base deformation due to heating can be avoided. .

Further, the material lined by the method of the present invention is:
Since pressure molding is possible, air bubbles inside the material completely disappear, and a dense and smooth surface can be obtained. As a result, even when used for a long period of time, the surface is unlikely to be soiled unlike conventional soft materials, and the durability is dramatically improved.

[0047]

BEST MODE FOR CARRYING OUT THE INVENTION The soft lining material for a denture base of the present invention comprises:
Radical polymerizable methacrylic acid ester, a plasticizer, a liquid agent having a radical polymerization accelerator as an essential component, and a methacrylic acid ester polymer or copolymer, a powder agent having a radical polymerization initiator as an essential component, further comprising the liquid agent Alternatively, it is characterized in that a photopolymerization initiator is blended in one of the powders.

The liquid composition of the present invention contains, as essential components, a radically polymerizable methacrylate, a plasticizer, and a radical polymerization accelerator. Examples of the radically polymerizable methacrylate include methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, and n-butyl methacrylate. Monofunctional methacrylates such as butyl methacrylate, 2-hydroxyethyl methacrylate, ethylhexyl methacrylate, lauryl methacrylate and the like can be mentioned. These may be used alone or in combination of two or more.

Examples of the plasticizer which can be used in the liquid preparation of the present invention include well-known phthalic acid esters and abietic acid derivatives. Examples of these include phthalic acid esters such as butyl phthalate, octyl phthalate, dibutyl phthalate, dioctyl phthalate, butyl phthalyl butyl glycolate, butyl benzyl phthalate, and methyl aviate, butyl aviate,
Hydrogenated abietic acid esters such as octyl aviate; These may be used alone or in combination of two or more.

The amount of these plasticizers added is 65
It is set in the range of 95% by weight. Here, if the added amount of the plasticizer is less than 65% by weight, it is not possible to maintain a moldable plastic state for 5 minutes or more, and it becomes extremely difficult to pressurize and fill. The amount of the plasticizer added is 9
If the amount is more than 5% by weight, the polymerization reaction at ordinary temperature is remarkably reduced, and a plastic state that can be efficiently molded by the ordinary temperature polymerization reaction cannot be obtained.

The radical polymerization accelerator used in the liquid preparation of the present invention includes NN'-dimethylaniline, NN '
Tertiary amines such as -diethylaniline, NN'-dimethylparatoluidine and paratolyldiethanolamine; These may be used alone or in combination of two or more.

The amount of the radical polymerization accelerator varies depending on the type of methacrylate used, the type and amount of the radical polymerization initiator described later, and the required curing time at ordinary temperature. Is preferably set in the range of 0.1 to 3% by weight based on the total amount of Here, if the amount of the radical polymerization accelerator added is less than 0.1% by weight, the polymerization reaction rate at ordinary temperature becomes extremely slow, and it becomes impossible to efficiently form the stick. Further, if the amount is more than 3% by weight, a sufficient effect cannot be obtained, and adverse effects such as discoloration will be increased.

Further, the liquid agent of the present invention imparts releasability to the material and makes it easier to remove the sticky substance from the container.
An internal release agent may be added. Examples of materials that can be used for this purpose include liquid paraffin, silicone oil, and the like.
Common internal lubricating oils can be used.

On the other hand, the powder of the present invention contains a methacrylic acid ester polymer or copolymer and a radical polymerization initiator as essential components. Examples of the methacrylate polymer or copolymer that can be used here include polymers such as polymethyl methacrylate, polyethyl methacrylate, and poly n-butyl methacrylate;
Ethyl methacrylate copolymer, methyl methacrylate / n-butyl methacrylate copolymer and the like are included. These may be used alone or as a mixture of two or more.

These polymers or copolymers can have a wide range of molecular weights, but have an average molecular weight of 10,000 to 10
Those in the range of 100,000 are suitable. The particle size is preferably as small as possible in order to improve the solubility in the liquid component, and is preferably in the range of 1 μm to 100 μm.

The radical polymerization initiator that can be used in the powder of the present invention includes diacyl peroxides such as benzoyl peroxide and lauroyl peroxide.

The amount of addition of these radical polymerization initiators is
Depending on the type of methacrylate used, the type and amount of radical polymerization accelerator used, and the required curing time at room temperature, 0.05 to 5% by weight based on the total amount of the methacrylate polymer or copolymer used. Is preferably within the range. Here, when the addition amount is lower than 0.05% by weight, both the room temperature polymerizability and the photopolymerizability decrease, and the predetermined physical properties cannot be obtained. Further, if the amount is more than 5% by weight, a sufficient effect cannot be obtained.

The powder of the present invention may contain an inorganic filler or various fibers for the purpose of improving mechanical strength and hardness. Examples of the inorganic filler include glass powder, inorganic fillers such as silica, alumina, and silicon nitride. Examples of the fiber include glass fiber, carbon fiber, and aramid fiber. Further, depending on the purpose of use, pigments, dyes, and red fibers can be blended and appropriately colored.

Furthermore, in order to impart photopolymerizability to the material of the present invention, it is an essential condition that a photopolymerization initiator is added to at least one of a powder and a liquid. The photopolymerization initiator that can be used here is not particularly limited, but a chain α-diketone compound such as benzyl or 2.3-pentanedione, a finger-ring α-diketone compound such as camphorquinone, or a polynuclear compound such as anthraquinone or naphthoquinone. Quinone, 2-methyl-1.4 naphthoquinone,
1.2-Polynuclear quinone derivatives such as benzanthraquinone. These may be used alone or in combination of several types.

The amount of the photopolymerization initiator to be added varies depending on the composition of the liquid and powder components, but is preferably in the range of 0.05 to 3% by weight. Here, the addition amount is 0.05
When the amount is less than 3% by weight, the polymerization reaction does not efficiently occur when irradiated with light, and when the amount is more than 3% by weight, the effect hardly changes, and conversely, the yellowing of the material becomes remarkable. Occurs. In addition, these photopolymerization initiators may be added to any of powders and liquids.

The soft lining material for a denture base of the present invention comprises a liquid and a powder, and the liquid and the powder are mixed when used. The ratio between the powder and the liquid in this case depends on the liquid, the composition of the powder, and the required softness of the material, but the weight ratio of the powder / liquid may be in the range of 2 / 0.8 to 2.5. preferable. Here, if the ratio of the liquid agent is less than 0.8,
The powder cannot be sufficiently wet with the liquid, and a uniform molded product cannot be obtained. Further, when the ratio of the liquid agent is larger than 2.5, the time until the mixture can be filled into a plastic state, that is, a sticky state becomes extremely long,
Workability decreases. The material after curing becomes softer by increasing the ratio of the liquid agent, so that the powder-liquid ratio may be appropriately adjusted as needed.

Next, as a method of filling the mixture of the powder and the liquid into a gypsum mold, a commonly used pressure filling method can be adopted, but a pressure injection method can also be applied.
In this case, fill the cylinder with the elasticized material,
Pressurized injection may be performed according to a conventional method.

Further, the method of lining a denture base according to the present invention is characterized in that a material is filled in a gypsum mold, molded, then the molded article is taken out of the mold and irradiated with visible light. There is no particular limitation on the time from the removal to irradiation with visible light, and it may be immediately after the removal or after several hours have passed.

The light source used in the method of the present invention can be used without particular limitation as long as it emits visible light, such as a halogen lamp, a xenon lamp, and a fluorescent tube.

However, if an irradiator that generates a large amount of heat during light irradiation is used, a problem of deformation due to heat occurs. Therefore, it is preferable to use an irradiator that generates as little heat as possible.

The irradiation time in this case varies depending on the photopolymerization reactivity of the composition, the light energy of the light irradiator, the distance between the material and the light source, and is preferably in the range of 1 to 20 minutes. Here, if the irradiation time is shorter than 1 minute, the photopolymerization reaction cannot be sufficiently caused. If the irradiation time is longer than 20 minutes, the effect of extending the time cannot be sufficiently obtained, and the working efficiency deteriorates. If a light irradiator that generates a large amount of heat must be used, light irradiation may be performed with the denture base immersed in water.

[Experimental Example] Next, an experimental example of the present invention will be described.
However, the present invention is not limited to the experimental examples shown here. (Experimental example 1) Butyl phthalyl butyl glycolate 80
Parts, 8 parts of methyl methacrylate, 5 parts of isobutyl methacrylate, 4 parts of 2-hydroxyethyl methacrylate,
Liquid paraffin (2 parts) and NN'-dimethyl paratoluidine (1 part) were placed in a beaker and mixed for 10 minutes to prepare a liquid preparation.

99.2 parts of polyethyl methacrylate powder having an average particle diameter of 30 μm and an average molecular weight of 250,000, benzoyl peroxide 0.5 part, and camphorquinone 0.3 part were put in a ball mill and mixed for 10 minutes to prepare a powder. .

1.8 g of the liquid preparation and 2.0 g of the powder preparation were mixed in a polyethylene container, the time required for the mixture to peel off from the container was measured, and this was defined as the sticking time. The flow characteristics of the mixture were measured with a rheometer, the time required for the elasticity to appear from the chart was determined, and the time from the above-mentioned elasticity time to the appearance of the elasticity was calculated.

A sample obtained by mixing powder and liquid at the same ratio was 25 ×
The mold was filled in a 25 × 3 mm Teflon mold, and the upper surface was pressed with a Teflon plate and cured as it was. 30 from the start of powder-liquid mixing
After a minute, the test piece was taken out of the mold, placed in a light irradiator equipped with two 125 w halogen lamps, and irradiated with light for 10 minutes. The surface hardness of the test piece was measured using a JIS hardness tester. After the light-irradiated test specimen was stored at room temperature for one day, the surface hardness was measured again. The results are summarized in Table 1.

The material immediately after molding was very soft and had plasticity, but upon irradiation with light, the plasticity disappeared and changed to a viscoelastic state.

The sticky material obtained from the material of the present experimental example was
A gypsum mold having an inner size of 25 × 65 × 3 was pressure-filled according to a usual method. In this case, the test pressure for one minute and the subsequent deburring were repeated three times in total, and the final clamping was performed for the fourth time. After the final mold clamping, the molded product was left at room temperature for 30 minutes, taken out of the mold, and its appearance was observed. as a result,
The molded product obtained was extremely dense on the molding surface without causing filling failure.

Experimental Example 2 75 parts of butyl phthalyl butyl glycolate, 7 parts of methyl methacrylate, 6 parts of isobutyl methacrylate, 5 parts of n-butyl methacrylate,
4 parts of 2-hydroxyethyl methacrylate, 2 parts of liquid paraffin, and 1 part of NN'-dimethylparatoluidine were placed in a beaker and mixed for 10 minutes to prepare a liquid preparation.

Using the powder shown in Experimental Example 1, Experimental Example 1
The same test was performed. The results are summarized in Table 1.
Also in this case, the viscous state changed to a viscoelastic state by light irradiation, and good moldability was exhibited.

Comparative Example 1 99.5 parts of polyethyl methacrylate powder having an average particle diameter of 30 μm and an average molecular weight of 250,000,
0.5 part of benzoyl peroxide was put in a ball mill and mixed for 10 minutes to prepare a powder.

Using this powder and the liquid used in Experimental Example 1, a test was conducted in the same manner as in Experimental Example 1. Table 1 shows the results.

This material, like the material of Experimental Example 1, can be molded by press-fitting because it has a long retention time, but the material after molding is highly viscous and very soft. Because of the lack of photopolymerizability, it took about one day to obtain the desired physical properties.

Comparative Example 2 60 parts of butyl phthalyl butyl glycolate, 15 parts of isobutyl methacrylate, 10 parts of n-butyl methacrylate, methyl methacrylate 7
, 5 parts of 2-hydroxyethyl methacrylate, 2 parts of liquid paraffin, and 1 part of NN'-dimethylparatoluidine were placed in a beaker and mixed for 10 minutes to prepare a liquid preparation.

Using this liquid and the powder used in Comparative Example 1, the same test as in Experimental Example 1 was performed. The results are summarized in Table 1. In this case, the plastic holding time was as short as 5 minutes or less, so that elasticity appeared during the operation of test pressure and deburring, and the final mold clamping could not be performed.

[0080]

[Table 1]

[0081]

Since the present invention is configured as described above, it has the following effects. That is, the room-temperature-curable acrylic denture base soft lining material of the present invention performs plasticization and elasticity of the powder-liquid mixture by temporary curing by chemical polymerization, and after molding, by secondary curing by light irradiation. It is characterized by changing a plastic material into a viscoelastic material, and the mochi-formation is performed by a polymerization reaction at room temperature, so that the time required for mochi-formation can be significantly shortened. Even at the time when the reaction occurs, the plasticizing effect of the plasticizer blended in a predetermined amount in the liquid agent makes it possible to maintain the plasticity for at least 5 minutes or more,
This makes it possible to mold the room-temperature-curable acrylic soft backing material by the pressure filling method, which has been impossible in the past.

Further, after molding, the polymerization reaction can be completed in a short time by photopolymerization, and it is possible to change from a plastic state to a viscoelastic state. Thus, it is not necessary to perform the heat treatment over a long time.

The soft lining material for a denture base of the present invention
Since the waxy state is formed by the room temperature polymerization reaction, and its plastic state is maintained at room temperature for at least 5 minutes,
Despite being a room temperature polymerization type, molding by the pressure filling method becomes possible, and the material after room temperature polymerization undergoes a photopolymerization reaction by light irradiation and changes to a viscoelastic state in the final polymerization stage, There is no need for heating.

Therefore, when the denture base is lining using the soft lining material for a denture base of the present invention, the working time is greatly reduced, and the problem of denture base deformation due to heating can be avoided. Furthermore, since the lining material can be press-molded, air bubbles inside the material are completely eliminated, and a dense and smooth surface is obtained. The surface is less likely to become dirty, and the durability can be dramatically improved.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4C089 AA03 AA08 BD01 BE03 CA04 CA07 CA08 4J011 PA30 PA36 PA56 PA69 PA99 PB23 PB30 PB32 PC02 QA03 QA34 RA03 SA42 SA61 SA63 SA76 TA06 UA06 WA08

Claims (5)

[Claims] 1. A liquid preparation comprising a radically polymerizable methacrylate, a plasticizer and a radical polymerization accelerator as essential components, and a powder containing a methacrylic acid ester polymer or copolymer and a radical polymerization initiator as essential components. Further, a soft lining material for a denture base, wherein a photopolymerization initiator is blended in one of the liquid preparation and the powder preparation. 2. The soft lining material for a denture base according to claim 1, wherein the amount of the plasticizer added to the liquid preparation according to claim 1 is in the range of 65 to 95% by weight of the whole liquid preparation. . 3. The mixture of the liquid preparation and the powder preparation according to claim 1,
3. The method according to claim 1, wherein a radical polymerization reaction occurs at room temperature to change from a fluid state to a plastic state, and the plastic state is maintained at room temperature for at least 5 minutes. Soft lining for denture base. 4. The soft lining material for a denture base according to claim 1, wherein a photopolymerization reaction occurs by irradiating the material in a plastic state with visible light, and the material changes from a plastic state to a viscoelastic state. The soft lining material for denture base according to claim 1, 2 or 3, wherein the soft lining material is used. 5. A mixture of the liquid preparation and the powder preparation according to claim 1, which undergoes a polymerization reaction at room temperature to change into a plastic state, and the plastic state material is applied to a mucosal surface of a denture base embedded in a plaster mold. After filling under pressure and molding, the denture base is removed from the gypsum mold, and the material is irradiated with visible light to change the plastic molding into a viscoelastic state. Mounting method.