JPS6048912A - Impression material - Google Patents

Abstract

PURPOSE:To provide an impression material for dental use, having excellent moisture resistance, by using an alginic acid salt together with calcium sulfate and/or lead silicate and a filler as main components, and adding a higher aliphatic alcohol, higher fatty acid, their ester or 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) 0.01-5.0wt% one or more additives selected from C8-28 aliphatic alcohols, their esters, C8-28 fatty acids, their esters and salts. The addition of the above additive is effective to prevent the degradation of the alginate-based impression material by moisture in air or in raw materials during the preparation of the impression material or moisture absorbed from air after opening the package, and accordingly improves the storage stability of the material. The above impression material is preferably added further with a hexafluorotitanate, zinc oxide, etc. to suppress the permanent set of the kneaded impression material and reduce the lowering of the elastic strain of the material.

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 diatoms to alginate are called alginate-based impression materials or alginate impression materials, and are mainly used for tooth molding during dental treatment and restoration. It is used for taking. In the present invention, an impression material whose main components are (1) alginate, (11) calcium sulfate and/or lead silicate, and 01D filler is referred to as an alginate-based impression material. The above-mentioned alginate-based impression materials have the characteristics of good impression accuracy, the ability to reproduce minute details, and easy impression manipulation, and are most commonly used as dental impression materials. ing.

However, alginate-based impression materials have the disadvantage of poor storage stability due to moisture in the atmosphere and raw material powder during manufacture and moisture taken in from the atmosphere after opening. That is, the gelation time and the elasticity after gelation change over time due to the presence of water. Therefore, when manufacturing alginate-based impression materials, the utmost care must be taken to control the moisture content in the raw material powder and the humidity within the manufacturing facility during the rainy season and during hot and humid times. Furthermore, when a user uses the product, once the package is opened, it must be tightly sealed and stored in a dry place, and it must be used up as quickly as possible.

In order to overcome these drawbacks of alginate-based impression materials, it is necessary to prevent these reactions from proceeding. Therefore, (1) during production, raw materials for production are stored tightly closed, and raw materials with high moisture content are sufficiently dried and stored tightly closed. (2) If the humidity inside the manufacturing facility during manufacturing is high, it is necessary to take measures such as dehumidifying or discontinuing manufacturing. In addition, when using the product, once the package is opened, measures such as storing it in a desiccator containing dry material such as silica gel (I) must be taken.

However, during production, it requires a large amount of equipment and space to store the raw materials in a hermetically sealed manner, dry them (I), or dehumidify them (ζ), which is not economical. It is also inconvenient for the user to store it in a dry insertion resodicator.

Furthermore, it must be removed from the desiccator every time it is used.
At that time, it is exposed to moisture in the atmosphere, absorbs moisture from the atmosphere, and gradually deteriorates. To make matters worse, general users rarely actually store alginate-based impression materials in desiccators for drying. At best, jitsujo is stored in a well-sealed container with a stopper.

Therefore, each time the bottle is opened, it is exposed to fresh air containing moisture, which accelerates the deterioration of the impression material.

The present inventor has conducted intensive research to solve the above-mentioned instability of alginate-based impression materials economically and easily, and has finally succeeded in obtaining an impression material that is not easily affected by atmospheric humidity. Ta.

That is, the present invention provides an alginate-based impression material whose main components are (I) alginate, (11) calcium sulfate and/or lead silicate, and (011) filler, which comprises: (A) higher fat; At least one additive selected from the group consisting of group alcohols (B) esters of higher aliphatic alcohols (C) higher fatty acids (D) salts of higher fatty acids and esters of higher fatty acids is added. It is an impression material.

As the (1) alginate, (11) calcium sulfate and/or lead silicate, (iiD filler) used in the present invention, known fillers used in conventional alginate-based impression materials can be used without any restrictions. Specific examples of particularly preferably used alginates include sodium alginate, potassium alginate, triethanolamine alginate, etc. Also, calcium sulfate and 1-
Teke, calcium sulfate dihydrate, calcium sulfate hemihydrate,
Anhydrous calcium sulfate etc. are used. Furthermore, silicic acid or lead may be used in combination with calcium sulfate or alone.

Furthermore, diatomaceous earth, talc, silica, and aluminum hydroxide are used as fillers.

The amounts of these (+) alginate, (1) calcium sulfate and/or lead silicate, and (01i) filler are not particularly limited and may be selected from conventionally known ranges. To give an example of a particularly preferably used range, for example, the proportion of alginate in the total amount of these three components is 5 to 25% by weight, the proportion of calcium sulfate and/or lead silicate is 5 to 30% by weight, and the balance is 5 to 25% by weight. The most important feature of the impression material of the present invention is that A) higher aliphatic alcohol, B ) esters of higher aliphatic alcohols,
At least one additive selected from the group consisting of C) higher fatty acids, D) salts of higher fatty acids, and E) esters of higher fatty acids is added.

The higher aliphatic alcohol and fatty acid used in the present invention are preferably saturated or unsaturated aliphatic alcohols and fatty acids having 8 to 28 carbon atoms. If the number of carbon atoms is less than 8, the impression material may not be sufficiently moisture resistant due to its high volatility and hydrophilicity.

In addition, when the number of carbon atoms exceeds 28, it is difficult to obtain them industrially, so it is difficult to use them.

A specific example of such higher aliphatic alcohol is caprylic alcohol.

Caprylic alcohol, lauryl alcohol.

myristyl alcohol, cetyl alcohol.

Saturated alcohols such as stearyl alcohol and eicosyl alcohol; unsaturated alcohols such as citronellol, linalool, and oleyl alcohol. Furthermore, these alcohols may have other functional groups such as amino groups, ether groups, aldehyde groups, etc.

Examples of higher aliphatic alcohols include formic acid esters, acetate esters, butyric acid esters, and acrylic acid esters of the above-mentioned higher aliphatic alcohols.

Specific examples of higher fatty acids used in the present invention include caprylic acid and capric acid.

Lauric acid, myristic acid, palmitic acid.

stearic acid, araxic acid, behenic acid.

Saturated fatty acids such as lipnoceric acid and cerotic acid, and tuccinic acid, caprooleic acid, lindelic acid, lauroleic acid, tuzunic acid, myristoleic acid, palmitoleic acid, petroselic acid, oleic acid, vaccenic acid, and gadolenic acid.

Examples include unsaturated aliphatic acids such as erucic acid, ceracoleic acid, linoleic acid, lilunic acid, eleostearic acid, parinaric acid, and arachidonic acid. These fatty acids may have other functional groups such as amino groups, ether groups, aldehyde groups, etc.

1. Salts of fatty acids include sodium salts, calcium salts, magnesium salts, barium salts, lead salts, cobalt salts, zinc salts, aluminum salts, etc. of the above fatty acids.

Furthermore, examples of esters of fatty acids include methyl esters and ethyl esters of the above-mentioned fatty acids.

Examples include propyl esters and glycol esters.

The amount of the above additives used will vary depending on whether the additive is liquid or solid and also on the particle size of (1) alginate, (11) calcium sulfate and/or lead silicate, (1ii) filler, etc. However, in general, the impression material contains 0.01 to 5
．． It is preferably added in an amount of 0% by weight, and more preferably in a range of 0.05 to 1.0% by weight. If the amount of the additive used is less than the above range (9), sufficient moisture resistance may not be imparted to the impression material. In addition, if the amount of the additive exceeds the above range, it is not only economically disadvantageous, but also the permanent deformation of the resulting impression material becomes too large. Mixing with water may be difficult.

In addition to the components described above, it is preferable to add magnesium oxide, zinc oxide, etc. to the impression material in an amount of 0 to 20% by weight in order to reduce the permanent set of the impression material kneaded product. .

In addition, in order to reduce the permanent deformation while minimizing the decrease in the elastic strain of the impression material mix, and to improve the smoothness of the surface of the plaster model taken from the impression material, hexafluorotitanate, It is also a preferred embodiment to add hexafluorozirconate or the like. Furthermore, tertiary phosphate, birophosphate, and tripolyphosphate are used to adjust the gelation time to a suitable range, for example, about 1 to 5 minutes to improve operability.

(lO) It is preferable to add phosphates such as hexametaphosphate, oxalates, carbonates, and the like. These phosphates, oxalates, and carbonates are contained in the impression material in an amount of 0.05 to 5.0% by weight.
It is preferable to add within the range of .

When the alginate impression material to which the phosphate or oxalate is added absorbs moisture, the gelation time regulating effect of the phosphate or oxalate decreases. Therefore, the effect of imparting moisture resistance of the present invention is particularly remarkable for impression materials containing phosphate or oxalate.

As the 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 used without any limitation. For example, a method of mixing the above-mentioned components in a mixer, a method of mixing the components while pulverizing them in a pulverizing mixer, etc. are employed. The mixing order of each component is not limited at all. All components can be mixed at once, or additives can be added and mixed into the mixture of (1) alginate, (11) calcium sulfate and/or lead silicate and 011) filler, or , in advance (1) alginate, (11) calcium sulfate and/or lead silicate,
It is also possible to adopt a method of adding and mixing additives to each of the fillers and (ti+) fillers, and then mixing these together.

The impression material of the present invention can be used for molding 1) of various shapes. For example, in the treatment and restoration of teeth, we take impressions of the shape of the teeth.
It can also be used to make a prototype of the shape to be cast in the production of metal casting molds. Furthermore, in plastic molding, it can also be used to make a prototype of the shape to be molded.

As explained above (the impression material of the present invention has improved moisture resistance, changes in gelation time are suppressed even when stored for long periods of time or in high humidity conditions), , has excellent properties.

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 alginate-based impression materials in the following Comparative Examples and Examples are shown in Table 1 below.

Table 1 (13) Test method Mixing ratio of impression materials with the above composition (weight of water/weight of impression material)
2.9, and the gelation time of the kneaded product was measured. The gelation time was measured by the method specified in JIST 6505.

Comparative Example Table 1 A composition blended with the compositions Ab and B shown in Table 1 was prepared, a kneaded product was obtained according to the above test method, and a part of the kneaded product was used to determine the gelation time immediately after blending. It was measured. On the other hand, the remaining sample was placed in an atmosphere with a temperature of 23°C and a relative humidity of 9ON for 50 hours, and then the gelation time was measured in the same manner. The results are shown in Table 2.

Table 2 (14) Examples 1 to 20 The various higher aliphatic alcohols and their esters, higher fatty acids, their salts and their salts shown in Table 3 were added to the compositions A and B shown in Table 1 in advance. Ester was added and mixed into the impression material in a weight range of 0.01 to 5.0.

The impression material was exposed to an atmosphere at a temperature of 23C and a relative humidity of 90 for 50 hours in the same manner as in the comparative example, and then the gelation time was measured. The results are shown in Table 3.

Example 24 An impression material having a composition was prepared using a raw material in which 0.5 parts by weight of stearyl alcohol was added to 100 parts by weight of potassium alginate and 100 parts by weight of sodium oxalate. The impression material was heated to a temperature of 23°C as in the comparative example.
.

When the gelation time was measured after being exposed to an atmosphere of 90% relative humidity for 50 hours, the gelation time was 1 minute and 56 seconds.

Example 25 CaSOs ・2H20, Ca804-yH20, Zn
An impression material having a composition was prepared using a raw material in which 0.5 parts by weight of zinc stearate was added to 100 parts by weight of each of O, MyO, and 2ZrF4. The impression material was heated to a temperature of 23° C. in the same manner as in the comparative example.

When the gelation time was measured after being exposed to an atmosphere with a relative humidity of 9ON for 24 hours, the gelation time was 1 minute and 58 seconds.

Example 26.27 Additives from Table 4 were added to the composition of composition C shown in Table 1.
．． 5% by weight was added, and the gelation time was measured in the same manner as in Example 1. The results are shown in Table 4.

Table 4 patent applicant Tokuyama Soda Co., Ltd.

Claims (4)

[Claims] (1) In an alginate-based impression material whose main components are (1) alginate, (i+) calcium sulfate and/or lead silicate, and (iiD filler), (b) higher aliphatic alcohol (B) An impression characterized by the addition of at least one additive selected from the group consisting of esters of higher aliphatic alcohols (C) higher fatty acids (D) salts of higher fatty acids and esters of higher fatty acids. Material. (2) The impression material according to claim (1), wherein the additive is added to the impression material in an amount of 0.01 to 5.0% by weight. (3) The impression material according to claim (1), wherein the higher aliphatic alcohol has 8 to 28 carbon atoms. (4) The impression material according to claim (1), wherein the higher fatty acid has 8 to 28 carbon atoms.