JPS6048911A - Impression material - Google Patents

Abstract

PURPOSE:To provide an impression material for dental use, having low permanent set, by using an alginic acid salt together with calcium sulfate and/or lead silicate and a filler as main components, and adding a hexafluorotitanic acid salt and a hexafluorozirconic acid salt to the main components. CONSTITUTION:The objective impression material for dental use contains (A) an alginic acid salt, calcium sulfate and/or lead silicate, and a filler as main components, and (B) 0.1-5.0wt% hexafluorotitanic acid salt and a hexafluorozirconic acid salt (e.g. alkali metal salt, alkaline earth metal salt, ammonium salt, Cu salt, Ni salt or Mn salt). The addition of the above two components to an alginate-based impression material is effective not only to suppress the permanent set of the kneaded product remarkably, but also to reduce the lowering of the elastic strain to a negligible level. The above impression material is preferably added further with magnesium oxide, zinc oxide, etc. to increase the elastic modulus.

Description

[Detailed description of the invention] The present invention relates to an impression material mainly composed of alginate.

Impression materials made by adding hardening agents such as calcium sulfate and fillers such as diatomaceous earth to alginates are called alginate-based impression materials or alginate impression materials, and are mainly used for tooth impressions during dental treatment and restoration. used for.

In the present invention, (1) alginate, '(I+'
) Calcium sulfate and/or lead silicate and 411) An impression material whose main components are a filler is called an alginate-based impression material.

The above-mentioned alginate-based impression materials have characteristics such as good impression accuracy, the ability to reproduce minute details, and easy impression manipulation, and are the most commonly used impression materials for teeth. There is.

However, conventionally used alginate-based impression materials have five drawbacks, such as permanent deformation, that is, once distortion occurs due to stress, the remaining distortion is larger than that of rubber-based impression materials even after the stress is released. Therefore, it was not always satisfactory. Particularly in dental treatment and restoration, when impressions of teeth are taken, stress is applied when removing the impression material mixture from the jaw, resulting in distortion. For example, the tip of the tooth, the so-called crown, is generally larger than the root of the tooth, so when removing the impression material mixture from the jaw, the root of the tooth, which is smaller in size, is larger than the root. As it passes through the large crown of the tooth, the impression material mixture is pushed out and distorted.

Therefore, the use of an impression material with large permanent deformation has the disadvantage of poor impression accuracy.

In addition, there are two or three known methods for reducing the permanent set of an alginate-based impression material kneaded material, but none of them are suitable because the viscosity becomes too high, or other properties/conditions, such as reducing elastic distortion, are known. The need has not been completely resolved because it is unsuitable or cannot be used due to increased costs.

The present inventors have been diligently conducting research to reduce the permanent deformation of alginate-based impression materials and kneaded materials. As a result, surprisingly, by adding a specific compound to a known alginate-based impression material, it is possible not only to significantly reduce the permanent set of the kneaded alginate-based impression material, but also to reduce the elastic strain. The present inventors have found that the present invention has almost negligible effects, and have completed and proposed the present invention.

That is, the present invention provides an alginate-based impression material whose main components are (1) alginate, (I) calcium sulfate and/or lead silicate, and 011) filler, in which hexafluorotitanate is added to the impression material composition. This is an impression material to which at least two components of hexafluorozirconate and hexafluorozirconate are added.

As the (1) alginate, (i) calcium sulfate and/or lead silicate, and 611) filler used in the present invention, known materials used in conventional alginate-based impression materials can be used without any restriction. obtain. Specific examples of particularly preferably used alginates include sodium alginate, potassium alginate, and triethanolamine alginate. Further, as calcium sulfate, calcium sulfate dihydrate, calcium sulfate hemihydrate, and anhydrous calcium sulfate are used. Also, lead silicate may be used in combination with calcium sulfate or alone. Furthermore, as a filler, diatomaceous earth, talc, chestnut,
Aluminum hydroxide etc. are used.

The amounts of these (+) alginates, (1) calcium sulfate and/or lead silicate, and (lit) fillers to be used are not particularly limited, and may be selected from conventionally known ranges.

4? An example of a range preferably used is 8, for example,
The proportion of alginate in the total amount of these three components is
Calcium sulfate and/or lead silicate may be selected in an amount of 5 to 25% by weight, with the remainder being filler.

51 The most important features of the impression material of the present invention are the above (:) to (II+1)
Hexafluorotitanate (hereinafter also simply referred to as titanium fluoride) and hexafluorozirconate (hereinafter simply referred to as zircon fluoride) are included in the known component composition explained in .
At least two components are added.

It is known, for example, to add a titanium compound or a zirconium fluoride to an alginate-based impression material, for example, in Japanese Patent Publication No. 57-501426, DP2511168, and the like.

However, the purpose of adding these additives is, for example, to poison the effect of improving the surface hardness and surface smoothness of the plaster model taken from the impression, and to reduce the permanent deformation of the alginate-based impression material mix. It's not about decline.

While conducting research to improve the permanent set of kneaded alginate-based impression materials, the present inventors added both titanium fluoride and zirconium fluoride to the alginate-based impression materials. It has been found that it is possible to reduce the permanent set of the impression material kneaded product ~ 6- and also to reduce the decrease in elastic set. In other words, when titanium fluoride or zirconium fluoride is added separately to an alginate-based impression material, the permanent set decreases, and at the same time, the elastic strain also significantly decreases, but when both are added, the permanent set decreases significantly compared to when they are added alone. On the other hand, the elastic strain shows a larger value than when added alone. Although it is not clear how the above-mentioned excellent effects are achieved by adding titanium fluoride and zirconium fluoride to alginate-based impression materials at the same time, the present inventors believe that titanium fluoride and zirconium fluoride can be added together. It is believed that the zirconium fluoride and zircon fluoride act synergistically in some way to significantly reduce the permanent set of the kneaded alginate impression material.

The hexafluorotitanate and hexafluorozirconate salts used in the present invention are not particularly limited, and known metal salts and ammonium salts can be used. As the metal salt, in particular, alkali metal salts such as sodium, potassium, and lithium; alkaline earth metal salts such as magnesium, calcium, strontium, and barium; copper salts; nickel salts; manganese salts, and the like are preferably used.

The amounts of hexafluorotitanate and hexafluorozirconate to be added may vary depending on the amounts of alginate, calcium sulfate, metal oxide, etc., but they are generally added to the impression material in an amount of 0. A sufficient effect is exhibited at a content of 1 to 5.0% by weight, particularly 0.2 to 2.0% by weight.

In addition to the components described above, it is also a preferred embodiment to add magnesium oxide, zinc oxide, etc. in order to improve the elastic modulus of the impression material.

The amount of magnesium oxide and zinc oxide added to the impression material is preferably in the range of 0.1 to 201 m%. In addition, in order to improve operability by adjusting the gelation time to a suitable range, for example, about 1 to 5 minutes, phosphates such as tertiary phosphate, birophosphate, tripolyphosphate, hexametaphosphate, etc. It is also a preferred embodiment to add oxalate broth. It is preferable that the above-mentioned phosphate, cealate, or carbonate is added to the impression material in an amount in the range of 0.05 to 5% by weight.

Furthermore, in order to impart moisture resistance to the impression material of the present invention, higher aliphatic alcohols, esters thereof, or higher fatty acids,
One of the preferred embodiments is to add a salt thereof or an ester thereof.

These compounds are contained in the impression material in an amount of 0.01 to 5.0% by weight.
It is preferable to add it so that

As a method for mixing the components of the impression material of the present invention described above, any conventionally known powder mixing method or powder and liquid mixing method may be employed without any limitation. For example, a method of mixing the above-mentioned components in a mixer, a method of mixing them while pulverizing them in a pulverizing mixer, etc. are employed. The mixing order of each component is not limited at all. It is also possible to mix all the components at once, or (1) add titanium fluoride and zirconium fluoride to the mixture of alginate, (I) calcium sulfate or lead silicate and @) filler and mix; Or,
It is also possible to adopt a method of adding and mixing titanium fluoride and zircon fluoride to each of (1) alginate, 9-I) calcium sulfate or lead silicate, and Qll) filler in advance, and then mixing these. can.

The impression material of the present invention can be used for making molds of various shapes.

For example, it can be used to make a mold of the shape of a tooth in dental treatment and restoration, and it can also be used to make a mold of the shape to be cast in the production of a metal casting chamber. It is possible. Furthermore, in plastic molding, it can also be used to make a prototype of the shape to be molded.

The impression material of the present invention described above is one in which the permanent set that occurs during mold-making is reduced, and the elastic set is prevented from becoming too small, and is an extremely useful impression material in practice.

The present invention will be described in more detail with reference to Examples below, but the present invention is not limited thereto.

The compositions and test methods of the Gero impression materials used in Comparative Examples and Examples below are as follows.

-10- Mixture Table 1 Test Mixing ratio of impression material with the composition according to the method (weight of water/weight of impression material)
2.9 and measured the elastic strain and permanent strain of the kneaded product.Measurement of 0 elastic strain and permanent strain was performed using JxB T 650.
11- Comparative Examples 1 to 9 An impression material compounded with the composition shown in Table 1 was prepared, and a kneaded product was obtained according to the above test method. After 5 minutes and 30
The elastic strain and permanent strain after 10 minutes were measured. Further, the additives listed in Table 2 were added to the above impression material, and the elastic strain and permanent set of the kneaded product were measured after 5 minutes and 30 minutes according to the above test method. The results are shown in Table 2.

Example 1 Both sodium titanium fluoride and potassium zircon heptafluoride were added to an impression material prepared according to the composition shown in Table 1, and the kneaded product obtained according to the above test method was tested after 5 minutes and 30 minutes. The subsequent elastic strain and permanent strain were measured. 3rd result
Shown in the table.

Table 3-13-Example 2 Both potassium titanium fluoride and potassium zirconium fluoride shown in Table 4 were added to the impression material prepared according to the composition shown in Table 1, and the mixture was prepared according to the test method described above. About Japanese food 5
Elastic strain and permanent strain were measured after 30 minutes and after 30 minutes.

The results are shown in Table 4.

Table 4-14- Example 3 Both lithium titanium fluoride and ammonium zirconium fluoride shown in Table 5 were added to an impression material prepared according to the composition shown in Table 1, and an impression material was obtained according to the above test method. The elastic strain and permanent strain of the kneaded product were measured after 5 minutes and 30 minutes. The results are shown in Table 5.

Table 5 Example 4 Titanium hexafluorotitanate and hexafluorozirconate shown in Table 6 were added to an impression material composition prepared according to the composition shown in Table 1 at a concentration of 0.5% by weight each. A kneaded product was obtained according to the above test method. The results of measuring the elastic strain and permanent strain of this kneaded product after 30 minutes are also shown in Table 6.

- 15- 1 17- -16 Example 5 The same procedure as in Example 1 (Table 3, No. 2) was carried out using an impression material blended with the composition shown in Table 7. As a result, the elastic strain of the kneaded product after 30 minutes was 11.4%, and the permanent strain after 30 minutes was 2.4 inches.

Table 7 patent applicant Tokuyama Soda Co., Ltd. -18-

Claims (4)

[Claims] (1) (1) In an alginate-based impression material whose main components are alginate, (U) calcium sulfate and/or lead silicate, and wholesale filler, the above impression material composition is: hexafluorotitanate and An impression material characterized by adding at least two components of hexafluorozirconate. (2) Claim (1) wherein hexafluorotitanate and hexafluorozirconate are each added in an amount of KO01 to 5.0% by weight in the impression material.
Impression material as described in section. (3) The hexafluorotitanate and hexafluorozirconate are respectively alkali metal salts, alkaline earth metal salts, or ammonium salts of hexafluorotitanic acid and hexafluorozirconate, Claim No. 1
Impression materials listed in ). (4) The impression set forth in claim (1), wherein the hexafluorotitanate and hexafluorozirconate are copper salts, nickel salts, or manganese salts of hexafluorotitanic acid and hexafluorozirconate, respectively. Material.