JPH10316520A - Impression material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a pasty impression, capable of reducing the transportation cost without deteriorating physical properties as the impression material and further good in kneading properties with water at the time of collecting an impression. SOLUTION: This pasty impression material contains (1) an alginate, e.g. potassium alginate, (2) calcium sulfate and/or lead silicate, (3) a nonaqueous solvent, e.g. liquid paraffin, ethylene glycol, propylene glycol, polyethylene glycol, oleyl alcohol or olive oil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impression material for molding mainly composed of alginate.

[0002]

2. Description of the Related Art An impression material comprising an alginate and a polyvalent metal salt such as calcium sulfate is called an alginate-based impression material or an alginate impression material. Used for picking.

[0003] The alginate impression material has features such as good impression accuracy, reproducibility of fine parts, and easy impression operation, and is most often used as a dental impression material. ing.

There are two types of alginate-based impression materials: powdery and pasty. Powdered impression material is a mixture of alginate and polyvalent metal salts such as calcium sulfate and all components such as fillers in powder form, and kneaded with water when taking an impression at a dental clinic, etc. Used in paste form.
On the other hand, for the paste-like impression material, a paste in which alginate is kneaded with water is prepared in advance, and a polyvalent metal salt such as calcium sulfate is mixed at the time of use. The polyvalent metal salt may be added as a powder or as a paste kneaded with water.

In a powdery impression material, when the impression material is kneaded with water, the alginate and the polyvalent metal salt are dissolved in water, and the carboxyl group of alginic acid is cross-linked by the polyvalent metal ion to form a gel. It becomes a cured body having elasticity. Similarly, when a polyvalent metal salt is added to the alginate paste, the paste-like impression material is crosslinked and gelled.

[0006]

The above-mentioned paste-like impression material can be automatically measured by flow rate control.
Mixing operation at the time of impression collection is simple. For this reason, the demand for paste-like impression materials has recently increased. However, in the paste-like impression material, alginate is already kneaded with water to form a paste, as described above. Since the proportion of alginate in the final kneaded material of the impression material is usually 2 to 10% by weight, the amount of alginate in the paste is small, and most of the paste is water. Therefore,
The paste-like impression material has a large ratio of water to the whole weight, and there is a problem of cost increase in transportation from the manufacturer to the user.

[0007]

The present inventors have conducted various studies to solve the above-mentioned problem of the paste-like impression material, and as a result, have found that a non-aqueous solvent is mixed with alginate and a polyvalent metal salt. As a result, the inventors have found that the above problem can be solved without adversely affecting the physical properties of the impression material, and have led to the present invention.

That is, the present invention relates to (1) alginate,
A paste-like impression material comprising (2) calcium sulfate and / or lead silicate, and (3) a non-aqueous solvent.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The paste-like impression material of the present invention is kneaded with water at the time of use. When water and the impression material are mixed, the alginate and calcium sulfate in the paste-like impression material and / or
Alternatively, lead silicate is dissolved in water and reacts to form a gel-like cured product having rubber elasticity.

As the alginate used in the present invention, a known alginate used in a conventional alginate impression material is used without any limitation. Specific examples of particularly preferably used ones include sodium alginate, potassium alginate, triethanolamine alginate and the like. Alginate is generally present in the final kneaded impression material in an amount of 2 to 10% by weight. The molecular weight of the alginate is not particularly limited, but generally a 1% by weight aqueous solution of the alginate having a viscosity of 50 to 1000 cps is used.

The calcium sulfate used in the present invention includes:
Calcium sulfate dihydrate, calcium sulfate hemihydrate, anhydrous calcium sulfate and the like can be used. Calcium sulfate and / or
Or lead silicate is sufficient to crosslink the alginate to obtain a cured body having the elasticity required for molding, and
To avoid wasteful use of calcium sulfate and / or lead silicate, 3 parts per 100 parts by weight of alginate
The amount is preferably 0 to 500 parts by weight, more preferably 50 to 300 parts by weight.

Next, as the non-aqueous solvent, any non-aqueous solvent can be used as long as it is liquid at normal temperature. Alginate and calcium sulfate and / or lead silicate hardly dissolve in the non-aqueous solvent, so they do not react even if they are mixed or form a paste.

As the non-aqueous solvent, there are two types, one that is compatible with water at an arbitrary ratio and one that is not. In the present invention, both of these can be used. When using a non-aqueous solvent that is not compatible with water at an arbitrary ratio, in a quantitative ratio that forms two phases with water used for kneading when using the impression material, using a surfactant described below, It is preferable to make these both compatible.

Specific examples of the non-aqueous solvent include hydrocarbon: chlorinated hydrocarbon: fluorinated hydrocarbon: aliphatic alcohol,
Monohydric or polyhydric alcohols such as cyclic alcohols, ethylene glycol, propylene glycol, polyethylene glycol, polypropylene glycol, glycerin:
Examples thereof include fatty acids, salts thereof, and esters thereof. Among them, higher alcohols having 8 to 20 carbon atoms, monohydric or polyhydric alcohols such as ethylene glycol, propylene glycol, polyethylene glycol, polypropylene glycol, and glycerin; hydrocarbons such as liquid paraffin; Higher fatty acids can be suitably used.

The non-aqueous solvent may be any amount that can be pasted, but 25 to 60 parts by weight based on 100 parts by weight of alginate.
0 parts by weight, and more preferably 100 to 300 parts by weight.

[0016] The impression material of the present invention may be a metal or metalloid oxide or hydroxide represented by aluminum or silicon as a filler, in addition to the above essential components, as long as the object of the present invention is not impaired. Minerals and the like may be added. Specific examples of the filler include diatomaceous earth, talc, silica, aluminum hydroxide and the like. Further, for the purpose of delaying gelation of the impression material, a gelling retarder such as a phosphate such as sodium phosphate or oxalic acid or a salt thereof may be added. Further, a fluorine compound such as sodium silicofluoride or potassium titanium fluoride may be added.

In order to improve the strength and elasticity of the cured body of the impression material, typical examples include oxides or hydroxides of calcium, magnesium, zinc, iron, titanium, nickel, barium, strontium, titanium, zirconium, and tin. May be added. Specific examples thereof include calcium hydroxide, magnesium oxide, zinc oxide, zinc hydroxide, iron oxide, iron hydroxide, titanium oxide, nickel oxide, strontium oxide, strontium hydroxide, zirconium oxide, and tin oxide.

These metal compounds may be used alone or in combination of two or more. The total amount of these components is 3 to 100 parts by weight per 100 parts by weight of alginate.
It is preferably in parts by weight.

Furthermore, a surfactant can be added to facilitate the kneading of the paste-like impression material and water and to uniformly mix the impression material and water. As the surfactant, a nonionic surfactant, a cationic surfactant, an anionic surfactant, an amphoteric surfactant and the like can be used. Among them, nonionic surfactants such as fatty acid esters of alcohol, fatty acid esters of polyoxyethylene glycol, fatty acid esters of polyglycerin, and polyoxyethylene alkyl ether can be preferably used. The amount of the surfactant used is 0.5 to 2 with respect to 1000 parts by weight of alginate.
It is preferably in the range of 00 parts by weight, more preferably 1 to 50 parts by weight.

If necessary, the water for kneading the paste-like impression material may contain the above-mentioned gel retarder, fluorine compound, metal compound and surfactant.

In order to increase the viscosity of the kneaded product after kneading the paste-like impression material and water, an unsaturated carboxylic acid polymer or a salt thereof can be added. Specific examples of unsaturated carboxylic acid polymers include acrylic acid, methacrylic acid, itaconic acid, maleic acid, glutaconic acid, aconitic acid, citraconic acid, mesaconic acid, tegulinic acid, fumaric acid, allylmalonic acid, crotonic acid, and vinyl acetic acid. Homopolymers of unsaturated carboxylic acids such as and copolymers thereof and their sodium salts, potassium salts, lithium salts,
Ammonium salts.

Since the paste-like impression material of the present invention contains alginate and calcium sulphate and / or lead silicate as its hardener in one paste, the impression can be obtained only by kneading with water at the time of use. A paste-like material to be collected can be easily obtained.

As a method of kneading the impression material of the present invention with water, kneading can be performed manually using a rubber rubber ball and a spatula, but it can be kneaded automatically using an automatic kneading device. You can also sum up. As a specific method of kneading with an automatic kneading apparatus, there is generally a method of discharging a predetermined amount of the paste-like impression material of the present invention and water to a stirring and mixing mechanism, and automatically mixing and kneading.

As a stirring and mixing mechanism, there are a method using a stirring blade, a screw, a jet, a method using a line mixer, and the like.

When the paste-like impression material and water are mixed using an automatic kneading apparatus, it is important to adjust the amount of water relative to the impression material within a certain range in order to obtain the desired performance. Since both the paste-like impression material and water are liquids, it is a great advantage that the mixing ratio can be easily adjusted and a kneaded impression material having a suitable viscosity can be obtained. Furthermore, mixing of the paste and water tends to provide a more uniform mixture than mixing of the powder and water.

On the other hand, in the case of a powdery impression material, the weight must be measured in order to accurately adjust the amount of the powder, so that the structure of the automatic kneading apparatus becomes complicated. Further, a complicated mixing mechanism is required to mix the powder and water to obtain a uniform slurry.

The impression material of the present invention can be used for molding for various purposes. For example, it can be used for molding teeth or gums in the treatment and restoration of teeth, and can also be used for molding a prototype of the shape to be cast in the manufacture of a metal casting mold. Further, it can be used for molding a prototype model of a shape to be molded in plastic molding.

[0028]

The impression material of the present invention described above is
Alginate, calcium sulfate and / or lead silicate, and a non-aqueous solvent are mixed to form one paste, so that at the time of impression collection, it can be used only by mixing with water. The method is simple and easy, and it is relatively easy to mix the paste-like impression material and water using an apparatus.

That is, as compared with the conventional powder impression material, the impression material can be measured not only by weight but also by volume, so that the mixing ratio between the paste and water can be adjusted more easily. Further, the paste-like impression material is easier to mix and knead with water than a powdery impression material, and a uniform kneaded product can be obtained easily.

Further, by adjusting the amount of water mixed with the paste-like impression material, the viscosity of the final kneaded impression material can be freely adjusted, so that a kneaded material having fluidity suitable for the purpose of the impression can be obtained. Can be.

Furthermore, compared to the conventional paste-like impression material obtained by dissolving alginate in water, it had to be kneaded with calcium sulfate powder or a mixed paste of calcium sulfate and a non-aqueous solvent. The paste-like impression material can collect an impression only by mixing with water, and is easy to use.

[0032]

The present invention will be described more specifically with reference to the following examples, but the present invention is not limited to these examples.

Example 1 The components shown in Table 1 were weighed in accordance with the respective mixing ratios and mixed and kneaded with a mixer having a stirring blade to produce a paste-like impression material. At that time, the viscosity was 900 poise.

10 g of the paste-like impression material is mixed with 10 g of water, and the gelation time is determined according to JIS T-6505.
When the elastic set and the permanent set were measured, the gelation time was 2
Minutes 30 seconds, elastic strain 13.5%, permanent set 3.0%.

[0035]

[Table 1]

Example 2 A paste-like impression material having a viscosity of 1000 poise was prepared in the same manner as in Example 1 using the components and the mixing ratios shown in Table 2.
When 10 g of this paste-like impression material and 10 g of water were mixed and kneaded, the gelation time was 2 minutes and 10 seconds, and the elastic strain was 14.0.
% And permanent set 3.5%.

[0037]

[Table 2]

Examples 3 to 8 In Example 1, a non-aqueous solvent and a surfactant shown in Table 3 were used instead of liquid paraffin as a non-aqueous solvent and polyoxyethylene lauryl ether as a surfactant. When an impression material was prepared in the same manner, the physical properties shown in Table 3 were obtained.

[0039]

[Table 3]

Examples 9 to 13 In Example 1, when the amount of water mixed with the paste-like impression material was changed, the results shown in Table 4 were obtained.

[0041]

[Table 4]

Example 14 The components shown in Table 5 were weighed in accordance with the respective mixing ratios, and mixed and kneaded with a mixer having a stirring blade to produce a paste-like impression material. At that time, the viscosity was 700 poise.

10 g of the paste-like impression material was mixed with 7 g of water, and the physical properties were measured in the same manner as in Example 1. The gelation time was 2 minutes and 40 seconds, the elastic strain was 14.0%, and the permanent strain was 3.
5%.

[0044]

[Table 5]

Claims (1)

[Claims] 1. A paste-like impression material comprising (1) alginate, (2) calcium sulfate and / or lead silicate, and (3) a non-aqueous solvent.