JPH0899816A - Denture stabilizing agent composition - Google Patents

Abstract

PURPOSE: To provide a denture stabilizing agent composition having remarkably improved releasability from the denture base and the oral cavity without lowering the adhesivity and the operability such as squeezability from a tube, applicability to the denture base, etc. CONSTITUTION: A denture stabilizing agent composition composed mainly of a polyvinyl acetate resin is incorporated with preferably 0.5-20wt.%, especially 2-10wt.% of a colloidal hydrated silicate. The colloidal hydrated silicate is salts of one or more metals selected from aluminum, magnesium and iron, especially preferably montmorillonite substituted with one or more metal ions selected from sodium, potassium, magnesium and calcium. The addition of the colloidal hydrated silicate having high hydration power improves the water- retainability of the composition, keeps the power for a long period without lowering the adhesivity and gives an excellent peelability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paste-like denture stabilizer based on polyvinyl acetate resin.

[0002]

2. Description of the Related Art Conventionally, removable dentures are often made to fit the wearer at first, but in many cases, the dentures become distorted due to distortion as the number of days of use increases.
When such a denture is used, the force is only partially applied to the denture when chewing food, and inflammation occurs in the oral cavity of that part. Further, if there is a gap in the denture base, food or the like may enter into that portion, causing pain in many cases.

Therefore, the denture base is stably mounted in the oral cavity,
Paste-like denture stabilizers based on polypinyl acetate are widely used for the purpose of improving compatibility problems. The properties required for these denture stabilizers are harmless to the human body and, of course, are excellent in the feeling of wearing dentures when they are used, but they are extruded from a container such as a tube. Characteristics such as easy application to the denture base, excellent adhesion, long-term adhesion, and easy peeling from the palate and denture base during removal are also important.

However, conventional denture stabilizers do not satisfy all of these characteristics, and in particular, the adhesive force to the oral cavity and the denture base and the ease of peeling are in a trade-off relationship, and the conventional denture base has the adhesive force. For the sake of importance, when removing the denture, some of the denture stabilizer remains attached to the oral cavity or the denture base, and it is difficult to remove the denture stabilizer as a whole.

As a method for improving the peeling property of a denture stabilizer while maintaining other properties, Japanese Patent Publication No. 60-21123 discloses a polyvinyl acetate resin having a relatively low degree of polymerization and a polyacetic acid having a relatively high degree of polymerization. It is disclosed to use a base material in which a vinyl acetate resin is compounded in a compounding ratio within a certain range. JP 61-
No. 73,648 and JP-A-62-129210 disclose denture stabilizers using a partially saponified polyvinyl acetate resin and having excellent releasability, and JP-A-2-124808 discloses lower alkyl acrylate, lower alkyl methacrylate and methacrylic acid. Disclosed is a strippability improving agent for a denture stabilizer, which comprises a copolymer of trimethylammonium ethyl acid chloride. Furthermore, JP-A-2
No. 292207 discloses a peelability improving agent for a denture stabilizer, which comprises a polymer having a quaternary ammonium salt. Further, Japanese Unexamined Patent Publication No. 4-149110 discloses a denture stabilizer excellent in releasability in which a polyvinyl acetate resin is used as a base material and dimethylsiloxane is blended therein, and Japanese Unexamined Patent Publication No. 5-65211 discloses a denture stabilizer containing polyvinyl acetal diethylaminoacetate and excellent in releasability. Each denture stabilizer is disclosed.

[0006]

Although the above-mentioned conventional methods for improving the peelability of denture stabilizers have some effects, as described above, the adhesive force and the peelability of the denture stabilizer are in a trade-off relationship. Therefore, the above conventional method does not sufficiently satisfy both characteristics.

Accordingly, it is an object of the present invention to provide a denture stabilizer having both the required adhesive force and excellent peeling property.

[0008]

[Means for Solving the Problems] In order to achieve the above object,
As a result of intensive studies, the present inventors have found the following. Denture stabilizers based on polyvinyl acetate resin usually swell the polyvinyl acetate resin with ethanol and water to provide the required flexibility and adhesion. By adjusting the blending amount of ethanol and water, the adhesive force and peeling property can be adjusted. When the water content is large, the peeling property is improved but the adhesive force is decreased. Further, the water content can be blended only at about 10%, and when the water content increases, the polyvinyl acetate resin becomes hard and it becomes difficult to extrude it from the tube or apply it to the denture base. Therefore, in order to increase the water content without increasing the free water content, a colloidal hydrous silicate such as montmorillonite having a high hydration power is added to a denture stabilizer composition based on polyvinyl acetate resin. By doing so, it is possible to increase the water retention of the composition, maintain the adhesive force for a long time without impairing the adhesive force, and give excellent releasability.Also, even if the water content increases, extrusion from a tube, denture The inventors have completed the present invention by finding that the operability during application to the floor is not impaired.

That is, the essence of the present invention is a denture stabilizer composition characterized in that a colloidal hydrous silicate is added to a denture stabilizer containing a polyvinyl acetate resin as a main component.

Examples of the colloidal hydrous silicate include a series of clay minerals called so-called montmorillonite group minerals such as colloidal hydrous aluminum silicate such as montmorillonite, iron magnesium salt such as iron montmorillonite, magnesium aluminum salt, iron aluminum salt and the like. Both are used,
It is of course possible to use purified bentonite containing these as the main components.

Among the colloidal hydrous silicates, montmorillonite is easily available as a high-purity refined product as bentonite of the Japanese Pharmacopoeia or as an industrially refined product.
Most suitable for use.

Montmorillonite has a typical structure of general formula (Al _5/3 Mg _1/3 ) Si ₄ O ₁₀ (OH) ₂ · W _1/3 · mH
₂ O, where W represents the metal element of the exchangeable cation. Its cation exchange ability is large, and montmorillonite exchanged with various cations can be used. For example, montmorillonite which has these cations between crystal layers immersed in an aqueous salt solution of sodium, potassium, calcium, etc. absorbs a very large amount of water due to the hydration of the cations and swells. It is extremely large and is preferably used.

The amount of the colloidal hydrous silicate added to the denture stabilizer composition of the present invention is not particularly limited, but it is 0.5-2.
0% by weight is preferred. If it is less than 0.5%, the amount of water that can be added is small and the effect of improving peelability is small. Even if added over 20%, the effect of improving the peelability does not increase and the cost increases. Considering the effect of improvement of peelability and cost, 2-1
It is further preferred to add 0% by weight of colloidal hydrous silicate.

[0014]

Examples and Comparative Examples Next, Examples and Comparative Examples of the denture stabilizer composition of the present invention will be described in detail. [Example 1] Polyvinyl acetate resin 50 parts by weight, sodium montmorillonite 2 parts by weight, ethanol 20 parts by weight,
33 parts by weight of water was mixed and kneaded to obtain a denture stabilizer composition of the present invention. This denture stabilizer composition was evaluated for extrudability from a tube, adhesion to fingers, ease of application to a denture base, and adhesion to a denture base. Further, after applying the denture stabilizer to the denture base, the denture base was immersed in artificial saliva at 37 ° C. for 24 hours, and the easiness of peeling when the denture stabilizer was peeled from the denture base with a finger was evaluated. Each evaluation is A:
Qualitative evaluation was performed on three grades of good, B: somewhat good, and C: bad, and the results are shown in Table 1.

[Table 1]

[Examples 2 and 3] In the same manner as in Example 1, the denture stabilizer composition of the present invention was prepared by changing the compounding ratio of its components, and various properties thereof were evaluated. The results are also shown in Table 1 as Examples 2 and 3.

The denture stabilizers of the present invention shown in Examples 1 to 3 are easy to apply because they do not adhere to the fingers very much, and have a necessary and sufficient adhesive force to the denture base, and after dipping in artificial saliva, they are applied with fingers. When peeled off, the applied denture stabilizer is peeled off as a unit, and since there is no unnecessary adhesive force, peeling can be performed extremely easily.

Comparative Example A denture stabilizer composition containing 72 parts by weight of polyvinyl acetate resin, 19 parts by weight of ethanol and 9 parts by weight of water was prepared as a comparative example, and its various characteristics were evaluated in the same manner as in the examples. The results are shown in Table 1 as a comparative example. In the case of this comparative example, since sodium montmorillonite was not blended, when 9 parts by weight or more of water was added, phase separation was not possible and a uniform composition could not be obtained.

Since the denture stabilizer of the comparative example in which sodium montmorillonite is not mixed easily adheres to the fingers,
It is difficult to apply to the denture base, and when peeling from the denture base, even if you try to pinch and remove the denture stabilizer with your finger, it is very difficult to peel because it has a large adhesive force to the denture base. Also, when immersed in artificial saliva, the solvent ethanol migrates into the liquid and it becomes hard and difficult to peel off.

[0019]

The colloidal hydrous silicate such as montmorillonite added to the denture stabilizer composition of the present invention has a crystal structure of colloidal particles having a layered crystal structure composed of a network of silicon and oxygen. Mediated by hydrated exchangeable cations. Due to the hydration properties of the cations, an extremely large amount of water is absorbed between the layers and the swelling is remarkable, and the aqueous colloidal dispersion becomes a colloidal solution having a high apparent viscosity and thixotropy.

When a colloidal hydrous silicate having such characteristics is added to a denture stabilizer composition containing a polyvinyl acetate resin as a main component, the amount of water that can be compounded without phase separation becomes extremely large, and Moisture can be added, and the releasability is greatly improved. Moreover, since the compounded water does not exist as free water, there is no decrease in the adhesive force of the denture stabilizer and operability in extrusion, coating and the like.

[0021]

EFFECTS OF THE INVENTION According to the denture stabilizer composition of the present invention, dentures can be obtained without lowering the adhesive force of the denture stabilizer, and without impairing the operability such as extrusion from the tube and application to the denture base. The peelability of the denture stabilizer from the floor and the oral cavity can be greatly improved.

Claims (5)

[Claims] 1. A denture stabilizer composition comprising a polyvinyl acetate resin as a main component, to which a colloidal hydrous silicate has been added. 2. The denture stabilizer composition according to claim 1, wherein the colloidal hydrous silicate is one or more metal salts selected from the group consisting of aluminum, magnesium and iron. 3. The denture stabilizer composition according to claim 1, wherein the colloidal hydrous silicate is montmorillonite. 4. The denture stabilizer composition according to claim 3, wherein the montmorillonite is a montmorillonite substituted with one or more metal ions selected from the group consisting of sodium, potassium, magnesium and calcium. 5. The amount of the colloidal hydrous silicate added is 0.
The denture stabilizer composition according to claim 1, 2, 3 or 4, which is in the range of 5 to 20% by weight.