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Alginic acid-containing aqueous composition, alginate impression material for dental applications, and substrate for alginate impression material for dental applications

By adding non-reducing sugars, especially trehalose, to the alginic acid aqueous composition, the aggregation of alginic acid is inhibited, the problem of viscosity reduction is solved, and the stability and impression of dental alginate impression materials are improved. The mold accuracy meets the needs of long-term use.

Inactive Publication Date: 2012-12-05
TOKUYAMA DENTAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in dental alginate impression materials mixed with these reducing sugars, it is almost impossible to suppress the decrease in viscosity over time in the above-mentioned aqueous alginic acid composition.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0127] Hereinafter, although an Example and a comparative example are given and demonstrated in order to demonstrate this invention concretely, this invention is not limited by these Examples and a comparative example at all.

[0128] I. Evaluation of viscosity retention and hardening

Embodiment A1

[0131] 1.0 g of alginic acid (manufactured by Kimi Kei Co., Ltd., M / G ratio = 1.2) was stirred and dissolved in 1000 g of distilled water. After the alginic acid was dissolved, 10 g of trehalose was added and dissolved as a non-reducing sugar.

[0132] For the composition prepared by the above method, the viscosity in a 23° C. constant-temperature water tank was measured using a Cannon-Fenske viscometer (manufactured by Shibata Scientific Co., Ltd.), which is a kind of capillary viscometer, and was used as the viscosity immediately after production. . Then, 50 mL of the composition was filled into transparent glass bottles, the glass bottles were tightly capped, and stored in a constant temperature tank at 50° C. for seven days. The viscosity was measured again after storage for seven days, and the viscosity retention (%) was calculated from the viscosity measurement values ​​of the composition before and after heat treatment according to the following formula (2). Table 1 sh...

Embodiment A2～A4

[0135] (Examples A2 to A4, Comparative Examples A1 to A3)

[0136] According to the method of Example A1, alginic acid-containing aqueous compositions having different compositions shown in Table 1 were prepared. Table 1 shows the results of the composition and viscosity retention of each composition. Both sodium alginate and potassium alginate used were manufactured by Himek Corporation, and both had an M / G ratio of 1.2.

[0137] [Table 1]

[0138]

[0139] In Comparative Examples A1 to A3, no non-reducing sugar was contained at all, and in any of the cases, a decrease in viscosity over time was observed. In contrast, Examples A1 to A4 contained alginic acid or its derivatives, water, and non-reducing sugars, and in any case, in comparison with Comparative Examples A1 to A3 that did not contain non-reducing sugars, all It was confirmed that the decrease in viscosity over time was suppressed.

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PUM

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Abstract

Disclosed is an alginic acid-containing aqueous composition which contains (A) alginic acid or a derivative of same, (B) water, and (C) a non-reducing sugar. Also disclosed is an alginate impression material for dental use which uses the alginic acid-containing aqueous composition and a substrate for the alginate impression material for dental use, wherein the viscosity of the aqueous composition which contains alginic acid or a derivative of same is stably maintained for a long period.

Description

technical field [0001] The present invention relates to a dental alginate impression material and a matrix material for the dental alginate impression material. Background technique [0002] Alginic acid or its derivatives (hereinafter, they are also referred to as "alginic acids") have the property of becoming a very uniformly viscous solution when dissolved in an aqueous solution, and thus are required to have such viscous properties due to operability and the like. Viscous products, foods such as jam, sauce, mayonnaise, etc., ophthalmic compositions such as eye drops and contact lens care solutions, etc. are used. In addition, since alginic acid or its derivatives have the property of gelling in contact with polyvalent metal ions such as calcium ions, they are particularly commonly used as dental impression materials. [0003] However, it is known that the viscosity of such alginic acids decreases over time in an aqueous solution. Therefore, in an aqueous alginic acid s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K6/10A61K6/90
CPCA61K6/0088A61K6/10A61K6/0047A61K6/60A61K6/76A61K6/90C08L5/04C08L5/16
Owner TOKUYAMA DENTAL CORP
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