JP2001017449A - Binding agent for tray - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a resin tray and an alginate impression material from peeling from each other when the tray is removed from the oral cavity of a patient in taking the impression using the tray and the impression material in the field of dentistry. SOLUTION: As an adhesive for a resin tray and an alginate impression material, that comprising 100 pts.wt. of an organic solvent of an alcohol compound, ketone compound, ester compound, or the like, and 1-10 pts.wt. of fine powder of an average particle size of 10 μm or less of ultrafine particular silica, ultrafine particular alumina, ultrafine particular zirconia, or the like, dispersed in it is used. The resin tray and the alginate impression material can thus be strongly adhered to each other, and in removing the tray after taking the impression, a hardened body of the impression material can be prevented from peeling from the resin tray to be deformed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tray used for obtaining impressions of teeth and other types using an impression material in the field of dental care, and more particularly to an adhesive for a resin tray.

[0002]

2. Description of the Related Art An impression material is used for obtaining an impression for producing a model such as an abutment tooth in a restoration process of a cast crown or a prosthetic defect by an indirect method. Among the impression agents,
Alginate impression materials that utilize the property of hardening into a gel when kneading alginate and calcium sulfate in the presence of water are inexpensive and widely used.

[0003] In general, impression taking using an alginate impression material is performed by placing a kneaded base material and a hardening material before curing on a tray imitating a dental row, and placing the tray on the teeth so as to wrap the teeth in the oral cavity. After pressing and hardening, the tray and the hardened body are integrally removed from the teeth and removed outside the oral cavity.

[0004] The trays used at this time mainly include a ready-made metal tray (metal tray) whose size and the like are predetermined by a maker and a so-called individual tray individually designed for each patient. It can be used properly according to each application. As a personal tray, a resin tray (resin tray) is generally used, and as the resin tray, a resin tray mainly made of polymethacrylate is widely used.

In order to obtain an accurate impression, it is important to prevent the impression material from peeling off the tray when the cured impression material is removed from the oral cavity in order to avoid deformation of the impression. However, since the alginate-based impression material has a low adhesive strength to the tray, the above-described peeling may not be avoided even if the operation is performed with care.

[0006]

In order to solve such a problem, an adhesive for increasing the adhesive strength between the tray and the alginate impression material has been developed. However, currently available adhesives for alginate impression materials focus on adhesion to metal trays, and adhesion to resin trays is not sufficiently considered.

An object of the present invention is to provide an adhesive for improving the adhesion between a resin tray and an impression material such as an alginate-based impression material, and preventing the cured impression material from peeling off the tray at the time of taking an impression. With the goal.

[0008]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above problems, and as a result, when a composition obtained by dispersing a fine powder in an organic solvent was applied to the surface of a resin tray, the resin tray and alginate were dissolved. It has been found that a stable adhesive force with the impression material can be obtained, and the present invention has been completed.

That is, the present invention is an adhesive for trays comprising 100 parts by weight of an organic solvent and 0.1 to 10 parts by weight of a powder having an average particle size of 10 μm or less.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As the organic solvent used in the adhesive of the present invention, any known organic solvent can be used without any limitation, but it has permeability to the resin material of the resin tray.
It is preferred to use a highly volatile, less toxic organic solvent. When a highly volatile solvent is used, a drying operation described later can be easily performed. Further, when a solvent having high permeability to the resin is used, the adhesive strength is increased. As an index of resin solubility, there is a solubility parameter (δ).
= 17.4-20.5 (MPa) ^1/2 The organic solvent in the range of ^1/2 is particularly preferable because of high resin solubility.

Specific examples of the organic solvent usable in the present invention include alcohols such as methanol, ethanol, isopropyl alcohol and butanol, ketones such as acetone and methyl ethyl ketone, and aromatic hydrocarbons such as toluene, xylene and benzene. , Methyl acetate, ethyl acetate, butyl acetate, esters such as ethyl propionate,
Chlorinated solvents such as methylene chloride, chloroform, dichloroethane, trichloroethylene, tetrachloroethylene and the like can be mentioned.

Among them, ethyl acetate ｛δ = 18.6
(MPa) ^1/2 ｝, methylene chloride ｛δ = 19.8 (MP
a) ^1/2 % is particularly preferably used because it has high solubility in resin and high volatility. These organic solvents are used alone or in combination.

The powder used in the present invention is not particularly limited as long as it is a fine powder having an average particle diameter of 10 μm or less, and any known powder can be used without limitation. Further, the shape of the particles constituting the powder is not particularly limited,
Particles of an arbitrary shape such as a spherical shape, a substantially spherical shape, and an irregular shape can be used. If the average particle size of the powder exceeds 10 μm, it is considered that a physical fitting force with the impression material is difficult to obtain, but a sufficient adhesive force cannot be obtained. From the viewpoint that the powder hardly sediments when used in combination with an organic solvent and is easy to use, it is preferable that the average particle size of the powder is small, and the average particle size is 1%.
It is particularly preferable to use a powder having a size of not more than μm.

The average particle size of the powder can be measured by a particle size distribution meter. The control of the average particle size may be performed before the powder is dispersed in the organic solvent. It can also be carried out by appropriately measuring the particle size distribution of the suspension and checking the average particle size.

Specific examples of powders preferably used include dry ultrafine silica, dry ultrafine alumina, dry ultrafine zirconia, dry ultrafine titania, wet amorphous silica, fine magnesia, and fine powder. Inorganic oxide fine powders such as calcium carbonate, quartz fine powder, and gypsum fine powder are exemplified. These powders are used alone or in combination of two or more.

In order to enhance the dispersibility in an organic solvent, these fine powders may be used by treating the surface of particles with a surface treatment agent such as methylchlorosilane to make them hydrophobic.

The amount ratio of the organic solvent to the powder contained in the adhesive of the present invention is 0.1 to 10 parts by weight of the powder with respect to 100 parts by weight of the organic solvent. If the amount of the powder is less than 0.1 part by weight, a sufficient adhesive effect cannot be obtained.

The adhesive of the present invention includes 100 parts by weight of ethyl acetate or methylene chloride, and an average particle diameter of 1 μm.
The following ultra-fine silica powder of 0.1 to 10 parts by weight is most preferred because it is easy to dry and easy to handle and has extremely high adhesiveness.

In the adhesive of the present invention, the powder is preferably dispersed in an organic solvent from the viewpoint of adhesiveness. The method for dispersing the powder is not particularly limited, and known methods such as ultrasonic dispersion, disperser dispersion, and wet ball mill dispersion can be employed without any limitation.

In the adhesive of the present invention, a surfactant may be added as a third component in order to promote dispersion of the powder and prevent agglomeration as long as the effect of the present invention is not impaired.
As the surfactant used in the present invention, 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 and quaternary surfactants. Ammonium salts and the like, and amphoteric surfactants include polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene-polyoxypropylene block polymer, polyoxyethylene glycerin fatty acid ester, sucrose ester, polyoxydiethylene Examples include amines, block polymers of polysiloxanes and polyoxyethylenes, and the like. The surfactant is preferably used in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the organic solvent.

The method of using the adhesive of the present invention is not particularly limited. For example, the adhesive of the present invention is applied to a resin tray with a brush, a spatula, a brush or the like, or is sprayed and then dried to obtain an alginate impression material. And other impression materials. The drying may be left in the air to dry naturally, or may be dried by applying hot air.

The resin tray to which the adhesive of the present invention is adhered is not particularly limited, and any resin tray can be used. For example, a methacrylate polymer powder and methyl methacrylate are mixed and polymerized to form and use an arbitrary shape, a natural resin is used as a main component, and a thermoplastic is used. It is effective for any type of object.

The impression material to which the adhesive of the present invention is bonded is not particularly limited, but the effect is best exhibited when used for an alginate impression material. That is, the adhesive of the present invention is particularly useful as an adhesive between a resin tray and an alginate-based impression material.

The adhesive of the present invention works effectively on all alginate-based impression materials regardless of their type and composition. For example, a paste / paste type using a mixture of a base material paste containing alginate as a main component and a hardening material paste containing calcium sulfate as a main component, or a powder containing alginate and calcium sulfate as a main component Is effective for any type such as a type using water mixed with water.

A more specific example of an alginate-based impression material that can be suitably used in combination with the adhesive of the present invention is a substrate paste having a composition such as potassium alginate, silica powder, potassium hydroxide, polyacrylic acid, and water. And a hardening material paste composed of granular silica, liquid paraffin, zinc oxide, magnesium oxide, trisodium phosphate, potassium fluoride titanate, ultrafine silica, calcium sulfate, etc., and a base material paste and a hardening material paste are mixed. What is used after kneading, and what is used by mixing and kneading water with powder having a composition such as potassium alginate, silica powder, zinc oxide, magnesium oxide, trisodium phosphate, potassium fluorotitanate, calcium sulfate, etc. Can be mentioned.

[0026]

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

Example 1 7 parts by weight of fine zirconia was ultrasonically dispersed in 100 parts by weight of ethyl acetate {δ = 18.6 (MPa) ^1/2 } to obtain an average particle size of about 1.0 μm, which was used as an adhesive. .

After placing the adhesive in a glass container with a lid and shaking well immediately before use, the surface of the formed resin tray "Ostron II" (trade name: manufactured by GC Co., Ltd.) is properly applied with a spatula. And then forcedly dried by air blow. Then, after forcibly drying with an air blow, a commercially available alginate impression material “Tokuso A-1α” (trade name: manufactured by Tokuyama Corporation) was provided and an impression was obtained. 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 the time of removal, the cured body did not peel off. Further, the tray and the cured body of the alginate impression material were firmly adhered to each other, and cohesive failure occurred when they were torn apart after removal. The same operation was performed ten times, but the same result was obtained in each case.

Example 2 95 parts by weight of ethyl acetate and ethanol Δδ = 26.0 (M
Pa) 5 parts by weight of dry ultrafine powdered silica was ultrasonically dispersed in a mixture of ^1/2 1/25 parts by weight to obtain an average particle size of 0.25 μm, which was used as an adhesive.

An appropriate amount of the adhesive is applied to the surface of the formed resin tray “Ostron II” (trade name: manufactured by GC Co., Ltd.) with a brush, and is forcedly dried by air blow. Impression material "A-1α" (trade name: manufactured by Tokuyama Corporation) was provided and impressions were taken. After the alginate impression material was cured, the tray and the cured body were integrally removed from the tooth and removed outside the oral cavity. No peeling occurred when the alginate impression material was removed. In addition, it was confirmed that when the resin tray and the cured body of the alginate impression material were to be peeled off after the removal, cohesive failure occurred. The same operation was performed ten times, but the same result was obtained in each case.

Example 3 5 parts by weight of anhydrous gypsum was added to isopropyl alcohol Δδ = 2
3.5 (MPa) ^1/2 ｝ 50 parts by weight was pulverized with a wet vibration ball mill to an average particle size of about 0.6 μm, and then 50 parts by weight of ethyl acetate was added to obtain an adhesive.

The adhesive was placed in a glass container with a lid, shaken well, and then a ready-made resin tray “Tikiri tray A-
1 "(trade name: manufactured by Support Co., Ltd.) was applied in an appropriate amount with a brush. After forced drying by air blow, a commercially available alginate impression material “Aroma Fine DFIII” (trade name: manufactured by GC Co., Ltd.) was served to obtain an impression. After the alginate impression material was cured, the tray and the cured body were integrally removed from the tooth and removed outside the oral cavity. No peeling occurred when the alginate impression material was removed. In addition, when the resin tray and the cured body of the alginate impression material were peeled off by hand after removal and examined for adhesiveness, although cohesive failure did not occur, it was confirmed that there was considerable resistance and it did not easily peel off. .
The same operation was performed ten times, but the same result was obtained in each case.

Example 4 100 parts by weight of ethyl acetate and 10 parts by weight of dry ultrafine powder silica surface-treated with monomethyltrichlorosilane were dispersed with a disperser to give an average particle diameter of 0.3 μm, which was used as an adhesive. .

An appropriate amount of the adhesive is applied to the surface of a resin tray “Tray Resin” (trade name: Shofu Co., Ltd.) formed so as to conform to the dentition by a spatula and force-dried by air blow. When the impression was taken and removed in the same manner as in Example 1, no peeling occurred at the time of removal. In addition, it was confirmed that the tray and the cured body of the alginate impression material were firmly adhered to each other. The same operation was performed ten times, but the same result was obtained in each case.

Example 5 5 parts by weight of dry ultrafine powdered silica surface-treated with dimethyldichlorosilane was ultrasonically dispersed in 100 parts by weight of methylene chloride {δ = 19.8 (MPa) ^1/2 } to obtain an average particle diameter. About 1.0 μm was used as an adhesive.

An appropriate amount of the adhesive is applied to the surface of a resin tray “Tray Plastic” (trade name: manufactured by COE Co., Ltd.) molded to fit the dentition, and after being forcibly dried by air blow, When the impression was taken and removed in the same manner as in Example 1, no peeling occurred at the time of removal. The cured product of the tray and the alginate impression material was firmly adhered to each other, and it was confirmed that cohesive failure occurred when the two were torn apart after removal. The same operation was performed ten times, but the same result was obtained in each case.

Example 6 An adhesive obtained by ultrasonically dispersing 6 parts by weight of wet ultrafine powdered silica in 100 parts by weight of ethyl acetate (average particle size: 0.8 μm) was used as an adhesive.

An appropriate amount of the adhesive was applied to a resin tray in the same manner as in Example 2 and air-dried, and then impressions were taken and removed in the same manner as in Example 1. Did not. Also, when the tray and the cured body of the alginate impression material were to be peeled off after the removal, cohesive failure occurred. The same operation was performed ten times, but the same result was obtained in each case.

Comparative Example 1 An impression was taken and removed in the same manner as in Example 1 except that no adhesive was used. At the time of removal, a partial peeling occurred between the resin tray and the cured product. After removal, the resin tray and the cured body of the alginate impression material were peeled off by hand and examined for adhesion. As a result, although partial physical bonding was observed, they could be easily peeled off.

Comparative Example 2 15 parts by weight of dry ultrafine silica powder surface-treated with monomethyltrichlorosilane in 100 parts by weight of ethyl acetate was subjected to ultrasonic dispersion treatment to an average particle size of 0.3 μm, and this was used as an adhesive.

The adhesive was applied to a resin tray in the same manner as in Example 3, allowed to air dry, and then the impression was taken and removed in the same manner as in Example 1. At the time of removal, the resin tray and the cured product were removed. Partially peeled off between. After removal, the resin tray and the cured body of the alginate impression material were peeled off by hand and examined for adhesion. As a result, although partial physical bonding was observed, they could be easily peeled off.

This is presumably because the concentration of the fine powder in the surface treating agent component was too high, so that more fine powder than necessary adhered to the resin surface, and adhesion was inhibited.

Comparative Example 3 An adhesive obtained by ultrasonically dispersing 5 parts by weight of glass beads (average particle size: about 12 μm) in 100 parts by weight of ethyl acetate was used as an adhesive. After applying an appropriate amount of the adhesive to a resin tray in the same manner as in Example 3 and allowing it to air dry, an impression was taken and removed in the same manner as in Example 1. At the time of removal, no peeling occurred. After removal, the resin tray and the cured body of the alginate impression material were peeled off by hand to examine the adhesiveness. As a result, although partial physical bonding was observed, they could be easily peeled off.

When the same operation was repeated, a partial peeling occurred at the time of the third removal.

[0045]

By using the adhesive of the present invention,
The resin tray and the alginate impression material can be firmly bonded. Therefore, the cured impression material does not peel off from the resin tray and deform when the impression is taken. Therefore, a highly accurate and stable impression can be obtained.

The adhesive of the present invention can be used by a simple operation such as coating or spraying without performing operations such as mixing and kneading with other components, and is characterized by excellent operability. .

Claims (1)

[Claims] An adhesive for trays comprising 100 parts by weight of an organic solvent and 0.1 to 10 parts by weight of a powder having an average particle size of 10 μm or less.