JP2000160106A - Adhesive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an adhesive sticking a tray to an impression material when taking impression by using a metallic plate-like tray and an alginate impression material in dentistry field. SOLUTION: This adhesive is obtained by dissolving or suspending. 0.1-30 pts.wt. an alkaline earth metal compound such as calcium hydroxide, magnesium hydroxide, strontium hydroxide, calcium chloride and magnesium chloride in 100 pts.wt. water or an organic solvent such as an alcohol and a ketone, and dispersing 0.05-5 pts.wt. fine particles such as an ultrafine particle silica or an ultrafine particle alumina having <=1 μm average particle diameter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive which is preferably used for bonding an alginate impression material to a metal tray used for taking an impression, in an impression material used for molding teeth and the like. .

[0002]

2. Description of the Related Art To mold teeth for restoring teeth,
Generally, an alginate impression material is used. The alginate impression material utilizes the fact that an alginate as a base material and calcium sulfate as a hardening material are kneaded with water to obtain a gel-like hardened body. To mold teeth, generally, a mixture of a base material and a hardening material before curing is kneaded on a tray imitating a tooth row, and the tray is pressed against the teeth so as to wrap the teeth in the oral cavity. It is performed by removing the body from the tooth as a unit and removing it from the oral cavity.

[0003] The tray is mainly made of brass, brass plated with nickel or the like, or made of metal such as stainless steel.
Some have punch holes. However, when taking an impression using a plate-shaped metal tray, if you try to remove the tray and the hardened body from the teeth as a single piece, the tray and the hardened body will peel off and the hardened body will be greatly deformed. As a result, there arises a problem that a highly accurate impression cannot be obtained. Therefore, we have dissolved or suspended metal hydroxide or metal salt in water, organic solvent, etc. as an adhesive to bond the tray and the cured body so that the tray and the cured body do not peel off. Agent has been proposed (JP-A-10-175812).

[0004]

However, in the case where an adhesive obtained by dissolving or suspending the above-mentioned metal hydroxide or metal salt in water or an organic solvent is used, the type and surface condition of the metal tray are different. After coating, the surface became non-uniform due to liquid aggregation, and as a result, there was a problem that stable adhesiveness could not be obtained. Therefore, an adhesive between a metal tray and an alginate impression material having a stable adhesive force without causing non-uniformity on the tray surface was developed.

[0005]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above problems, and as a result, found that fine particles were contained in a composition in which an alkaline earth metal compound was dissolved or suspended in water or an organic solvent. When the liquid composition in which is dispersed is applied or sprayed on the surface of a metal tray, it is found that liquid aggregation does not occur, uniformity can be maintained, and that a stable adhesive force between the metal tray and the alginate impression material can be obtained. The present invention has been completed.

That is, the present invention relates to (B) 0.1 to 30 parts by weight of an alkaline earth metal compound and (C) an average particle diameter of 1 μm per 100 parts by weight of water or an organic solvent.
An adhesive containing 0.05 to 5 parts by weight of the following fine particles.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, water or an organic solvent (hereinafter collectively referred to as a solvent) can be used without any known limitation. As the water, distilled water is usually used. Examples of the organic solvent include alcohols such as methanol, ethanol, isopropyl alcohol and butanol, acetone, ketones such as methyl ethyl ketone, toluene,
Aromatic hydrocarbons such as benzene and xylene, hexane,
Examples include aliphatic hydrocarbons such as pentane and butane.
In particular, lower volatility alcohols having high volatility and low toxicity, such as ethanol and isopropyl alcohol, are preferable because they can be easily dried as described later. These solvents need not necessarily dissolve the alkaline earth metal compound described below, but may disperse them.

As the alkaline earth metal compound used in the present invention, known alkaline earth metal compounds such as alkaline earth metal hydroxides and alkaline earth metal salts can be used without limitation. Preferably, a compound which easily forms an alkaline earth metal ion is suitably used. When the alkaline earth metal compound is specifically exemplified, the alkaline earth metal hydroxide includes ruthenium hydroxide, magnesium hydroxide, barium hydroxide, strontium hydroxide and the like. Examples of the alkaline earth metal salts include chlorides such as ruthenium chloride, magnesium chloride, barium chloride, strontium chloride, ruthenium bromide, magnesium bromide, and barium bromide.
Phosphates such as calcium phosphate, magnesium phosphate and barium phosphate; citrates such as calcium citrate, magnesium citrate and barium citrate; acrylates such as calcium acrylate, magnesium acrylate and barium acrylate; methacrylic And methacrylates such as magnesium acrylate, magnesium methacrylate, and barium methacrylate. These are used alone or in combination. Particularly, hydroxides or chlorides of calcium and magnesium are preferable because they easily become ions and have extremely high adhesive strength.

The amount of these alkaline earth metal compounds must be 0.1 to 30 parts by weight based on 100 parts by weight of the solvent. If the amount of the alkaline earth metal compound is less than 0.1 parts by weight, a sufficient adhesive effect cannot be obtained, and
When the amount is more than the weight part, the adhesive becomes ununiform and the dispersibility is lowered, which is not preferable. In particular, the range of 1 to 25 parts by weight is preferable in consideration of the viscosity of the adhesive and the operability of the application or spraying operation accompanying the adhesive.

If the alkaline earth metal compound is difficult to dissolve in the solvent, it may be dispersed in the solvent. In this case, the particle size of the alkaline earth metal compound is preferably as small as 100 μm or less, and more preferably 10 μm or less, in order to prevent precipitation or aggregation of the alkaline earth metal compound.

Further, a surfactant may be added in order to prevent sedimentation or aggregation after dispersing the alkaline earth metal compound in a solvent. Known surfactants can be used without any limitation, and any of anionic surfactants, cationic surfactants, amphoteric surfactants and nonionic surfactants can be used.

Specific examples of the surfactant include anionic surfactants such as alkyl sulfonates, alkylbenzene sulfonates, and alkyl ether carboxylates, and cationic surfactants such as alkylamine salts. , Quaternary ammonium salts, etc., and as the amphoteric surfactant, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene-polyoxypropylene block polymer, polyoxyethylene glycerin fatty acid ester, sucrose ester , Polyoxydiethyleneamine, block polymers of polysiloxanes and polyoxyethylenes, and the like.

When the above surfactant is used, 0.01 to 10 parts by weight based on 100 parts by weight of the alkaline earth metal compound is used.
It is preferably in parts by weight.

As the fine particles used in the present invention, known fine particles can be used without any limitation as long as they have an average particle diameter of 1 μm or less. Regarding the shape of the particles, irregularly shaped particles including spherical particles can be used. If the average particle size exceeds 1 μm, it sediments and separates in the agent, which is not preferable.

Particularly preferred examples of the fine particles preferably used include dry ultrafine powder silica, dry ultrafine powder alumina, dry ultrafine powder zirconia, dry ultrafine powder titania,
Wet amorphous silica, colloidal silica, colloidal alumina, colloidal zirconia, inorganic oxides such as quartz fine powder, and organic fine powder such as polymethyl methacrylate,
Used alone or in combination of two or more. These fine powders may be used in the form of a surface-treated material whose surface is hydrophobized with methylchlorosilanes or the like in order to enhance dispersibility in an organic solvent.

The amount of the fine particles is preferably 0.05 to 5 parts by weight based on 100 parts by weight of the solvent. When the amount of the fine particles is less than 0.05 part by weight, a sufficient effect as a dispersion carrier cannot be obtained, and when the amount is more than 5 parts by weight, the adhesiveness is undesirably reduced.

The fine particles need to be appropriately dispersed in a solvent in order to exhibit the performance as an adhesive. As a method for dispersing the fine particles, a known method can be used without any limitation. Specific examples include ultrasonic dispersion, disperser dispersion, and wet ball mill dispersion.

The method of using the adhesive of the present invention is not particularly limited. Generally, a metal tray is used by applying with a brush, a spatula, a brush, or the like, or by spraying. After the application or the spraying, the film may be left in the air for natural drying, or may be dried by applying hot air.

As the alginate impression material to which the adhesive of the present invention is applied, known ones can be used without any limitation. More specifically, a paste / paste type in which a base paste containing alginate as a main component and a hardener paste containing calcium sulfate as a main component are used, or an alginate and calcium sulfate as a main component. And a mixture of water and water. More specifically, a base paste having a composition of potassium alginate, silica powder, potassium hydroxide, polyacrylic acid, water, etc., and granular silica, liquid paraffin, zinc oxide, magnesium oxide, trisodium phosphate, and fluorotitanic acid It consists of a hardening material paste having a composition of potassium, ultrafine silica, calcium sulfate, etc., and is used by mixing and kneading a base material paste and a hardening material paste, or potassium alginate, silica powder, zinc oxide, magnesium oxide, phosphoric acid There are powders having a composition such as trisodium, potassium fluorotitanate, calcium sulfate and the like mixed with water and used.

The present invention particularly relates to 1 to 25 parts by weight of hydroxides or chlorides of calcium and magnesium, 100 parts by weight of lower alcohol, and ultrafine silica or ultrafine alumina having an average particle diameter of 1 μm or less. An adhesive consisting of 2 parts by weight is preferred because it is easy to dry, easy to handle, and has extremely high adhesiveness.

[0021]

EXAMPLES The present invention will now be described by way of examples, but the present invention is not limited to these examples.

Example 1 3 parts by weight of anhydrous magnesium chloride were dissolved in 70 parts by weight of ethanol, and 0.1 part by weight of ultrafine silica powder was ultrasonically dispersed in 30 parts by weight of ethanol (average particle diameter: 0.3 μm).
m) After adding the solution, the solution was placed in a spray container and sprayed on a stainless steel plate tray in an amount of about 300 μl. When forced drying was performed by air blow, drying was uniform without liquid aggregation. A commercially available paste-like alginate impression material “Tokuso AP-1” (trade name: manufactured by Tokuyama Corporation) is placed on the tray to take an impression, and after the alginate impression material is cured, the tray and the cured body are integrally removed from the teeth. , Removed outside the mouth. The cured product of the tray and the alginate impression material was firmly adhered to each other, and it was confirmed that the cohesive failure of the cured product of the alginate impression material was caused when the tray was peeled off.

EXAMPLE 2 14 parts by weight of magnesium chloride hexahydrate was added to ethanol 10
The mixture was dissolved in 0 parts by weight, and 0.1 parts by weight of fine powder of polymethyl methacrylate having an average particle size of 0.2 μm was added thereto. After shaking this well, an appropriate amount was applied to a stainless steel plate-shaped tray with a brush, and forcedly dried by air blow, whereby the liquid was uniformly dried without liquid aggregation. Thereafter, an impression was obtained using a commercially available alginate impression material “Tokuso A-lα” (trade name: manufactured by Tokuyama Corporation). After the alginate impression material was cured, the tray was removed outside the mouth. The cured product of the tray and the alginate impression material was firmly adhered to each other, and it was confirmed that the cohesive failure of the cured product of the alginate impression material was caused when the tray was peeled off.

Example 3 10 parts by weight of calcium hydroxide (average particle size: 32 μm) and 0.2 parts by weight of dry ultrafine powder alumina (average particle size: 0.8
μm) was added to 100 parts by weight of ethanol, ultrasonically dispersed, and then placed in a glass container with a lid. After shaking well, an appropriate amount was applied to a brass plate-shaped tray plated with nickel with a spatula, and forcedly dried by air blow. This tray and a commercially available paste-like alginate impression material “Tokuso AP-
1 "(trade name: manufactured by Tokuyama Corporation) was used to take a normal impression, and after the alginate impression material was cured, the tray was removed outside the oral cavity. The cured product of the tray and the alginate impression material was firmly adhered to each other, and it was confirmed that the cohesive failure of the cured product of the alginate impression material was caused when the tray was peeled off.

Example 4 0.1 part by weight of dry ultrafine silica powder surface-treated with monomethyltrichlorosilane was added to isopropyl alcohol 10
0 parts by weight with a disperser (average particle diameter,
0.3 μm) and then 5 parts by weight of anhydrous magnesium chloride were added and dispersed, and then placed in a glass container with a lid. After shaking this well, an appropriate amount was applied to an aluminum plate tray with a brush and forcedly dried by air blow. A commercially available alginate impression material “TOKUSO A-lα” (trade name: manufactured by TOKUYAMA CORPORATION) was placed on the tray and a normal impression was obtained. After the alginate impression material was cured, the tray was removed outside the oral cavity, and it was confirmed that the tray and the cured body of the alginate impression material were firmly adhered to each other. .

Example 5 5 parts by weight of calcium hydroxide (average particle size 32 μm) and 0.4 parts by weight of dry ultrafine powder zirconia (average particle size: 0.9
μm) and 0.5 parts by weight of calcium surfactant tylhexanoate as a surfactant were added to 100 parts by weight of ethanol, ultrasonically dispersed, and then placed in a glass container with a lid. After shaking well, an appropriate amount was applied to a brass plate-shaped tray plated with tin with a brush and dried. Using this tray and the alginate impression material “TOKUSO A-1α” (trade name: manufactured by Tokuyama Corporation), a normal impression was taken, and after the alginate impression material was cured, the tray was removed outside the oral cavity. It was confirmed that the tray and the cured body of the alginate impression material were adhered to each other, and that the cured body of the alginate impression material was partially cohesive and destroyed when peeling was attempted.

Example 6 14 parts by weight of magnesium chloride hexahydrate was dissolved in 100 parts by weight of water, and then 0.1 part by weight of wet ultrafine silica powder (average particle diameter: 0.8 μm) was added thereto, followed by ultrasonic dispersion. After that, it was placed in a glass container with a lid. After shaking this well, an appropriate amount was applied to a stainless steel plate-shaped tray with a brush, and immediately, a commercially available paste-like alginate impression material “Tokuso AP-
1 "(trade name: manufactured by Tokuyama Corporation) was used to obtain an impression. After the alginate impression material was cured, the tray was removed outside the oral cavity. The cured product of the tray and the alginate impression material was firmly adhered to each other, and it was confirmed that the cohesive failure of the cured product of the alginate impression material was caused when the tray was peeled off.

Example 7 20 parts by weight of magnesium chloride hexahydrate was dissolved in 100 parts by weight of water, and 0.5 part by weight of colloidal silica having a concentration of 40% (colloidal average particle diameter 0.04 μm) was added thereto. And placed in a glass container. After shaking this well, an appropriate amount was applied to a stainless steel plate-shaped tray with a brush, and immediately, a commercially available paste-like alginate impression material “Tokuso AP-
1 "(trade name: manufactured by Tokuyama Corporation) was used to obtain an impression. After the alginate impression material was cured, the tray was removed outside the oral cavity. The cured product of the tray and the alginate impression material was firmly adhered to each other, and it was confirmed that the cohesive failure of the cured product of the alginate impression material was caused when the tray was peeled off.

Examples 8 to 11 3 parts by weight of anhydrous magnesium chloride were dissolved in 70 parts by weight of ethanol, and dry ultrafine silica powder surface-treated with dimethyldichlorosilane was added in an amount shown in Table 1 to 30 parts by weight of ethanol. Ultrasonic dispersion (average particle size, 0.2-0.4
μm), the solution was added to a spray container, and about 300 μl was sprayed on a nickel-plated brass plate tray. After drying by air blow, this tray and a commercially available paste-like alginate impression material "TOXSO AP-1"
(Trade name: Tokuyama Co., Ltd.) was used to take a normal impression, and after the alginate impression material was cured, the tray and the cured body were integrally removed from the teeth and removed outside the oral cavity. The adhesion state when the cured product of the tray and the alginate impression material was peeled off was checked. Table 1 shows the results. In each case, the cured product of the alginate impression material was cohesively broken.

Comparative Example 1 A solution prepared by dissolving 3 parts by weight of anhydrous magnesium chloride in 100 parts by weight of ethanol was placed in a spray container and sprayed on a nickel-plated brass plate tray in an amount of about 300 μl. When dried by air blow, liquid aggregation occurred unevenly on the metal tray surface. This tray and a commercially available paste-like alginate impression material "TOXSO AP-1"
(Trade name: Tokuyama Co., Ltd.) was used to take a normal impression, and after the alginate impression material was cured, the tray and the cured body were integrally removed from the teeth and removed outside the oral cavity. At this time, the state of adhesion when the cured product of the tray and the alginate impression material was to be peeled off was checked. Table 1 shows the results.

When no dry ultrafine powdered silica was added (Comparative Example 1), the tray and the cured body of the alginate impression material were physically joined, but when peeled off, the cured body of the alginate impression material was one-to-one. Only partial cohesive failure was observed, and it was confirmed that the interface fracture was mostly caused. This uneven adhesion
It is presumed that since the components did not contain fine powder, liquid aggregation occurred during drying and the components became non-uniform.

[0032]

[Table 1]

Comparative Example 2 20 parts by weight of magnesium chloride 6 anhydrate was added to ethanol 1
100 parts by weight was placed in a spray container, and placed on a nickel-plated brass plate-like tray in a thickness of 300 μm.
1 was sprayed. When air blow was performed, liquid aggregation occurred unevenly on the metal tray surface. This tray and a commercially available paste-like alginate impression material "TOXSO AP-1"
(Trade name: Tokuyama Co., Ltd.) was used to take a normal impression, and after the alginate impression material was cured, the tray and the cured body were integrally removed from the teeth and removed outside the oral cavity. Although this tray and the cured body of the alginate impression material are physically bonded, when peeled off, only a cohesive failure was observed in the cured body of the alginate impression material, and most of the fractured interface was broken. It was confirmed.

Comparative Example 3 A normal impression was obtained using an untreated stainless steel plate-like tray and a commercially available paste-like alginate impression material “TOKUSO AP-1” (trade name, manufactured by Tokuyama Corporation). After curing of the material, the tray was removed outside the oral cavity. Although the tray and the cured body of the alginate impression material were physically joined, no adhesion was observed when peeled off, and it was confirmed that both of them caused interfacial destruction in the form of a seal.

COMPARATIVE EXAMPLE 4 An alginate impression material "TOXSO A-1α" (trade name, manufactured by Tokuyama Corporation) was used for each of two types of untreated brass and a plate-shaped tray in which nickel was plated on brass. A normal impression was taken. After the alginate impression material was cured, the tray was removed outside the oral cavity, and the state of each tray was confirmed. As a result, these trays and the cured body of the impression material were physically bonded, but no adhesion was observed when peeled off, and both broke at the interface.

[0036]

By using the adhesive of the present invention,
The metal tray and the alginate impression material adhere firmly. Further, the adhesive of the present invention hardly causes non-uniformity due to liquid aggregation on the metal surface due to the presence of the fine particles, and can reproduce stable adhesive strength. Therefore, it is possible to obtain a highly accurate and stable impression without causing the cured impression material to be partially separated from the metal tray or to be deformed due to the operation.

The adhesive of the present invention is a suspension or a solution, and is used by application or spraying without any operation such as mixing or kneading with other components, and thus has excellent operability. Furthermore, each additive component does not include a viscous or curable substance that adheres to the metal tray, and a corrosive or soluble substance that attacks the metal tray. Therefore, the adhesive itself between the metal and the alginate impression material does not accumulate on the metal tray or damage the metal tray.

Continued on the front page F term (reference) 4C089 AA14 BA03 BA18 BE16 CA03 4J040 AA011 DF052 HA121 HA136 HA151 HA306 HA356 HB02 HB03 HB09 HB19 JA02 JA03 KA03 KA23 MA01 MA02 NA03

Claims (1)

[Claims] 1. (A) 100 to 100 parts by weight of water or an organic solvent, (B) 0.1 to 30 parts by weight of an alkaline earth metal compound, and (C) 0.05 fine particles having an average particle diameter of 1 μm or less. An adhesive characterized in that the adhesive comprises up to 5 parts by weight.