A kind of dental alginate impression material and its preparation method

Abstract

The invention discloses a dental alginate impression material and its preparation method and application. The dental alginate impression material is prepared by mixing the following raw materials in parts by weight: 8-18 parts of alginate, 8-18 parts of gelling agent, 2-8 parts of retarder, 1-5 parts of powder gum base, 50-80 parts of filler, 0.5-5 parts of plasticizer, and 0-1.5 parts of other additives. The impression material provided by the invention has uniform appearance, no impurities, uniform texture after adding water, no agglomeration, no granulation, no air bubbles, smooth surface, and the product has strong flexibility, is not easy to tear or deform, and the accuracy of mold taking high.

Description

technical field [0001] The invention relates to the technical field of impression materials, more specifically, it relates to a dental alginate impression material and a preparation method thereof. Background technique [0002] In oral restoration, all materials that can be used to obtain various maxillofacial and oral soft and hard tissue shadows are called impression materials. An impression is the negative mold of an object, and an oral impression is a negative mold of a certain part of the oral cavity, and it is also a negative mold for recording the shape and relationship of various parts of the oral and maxillofacial region. [0003] The ideal impression material should meet the following conditions: (1) non-irritating to the soft and hard tissues in the oral cavity, non-toxic and harmless to the human body; (2) good fluidity, plasticity and elasticity. Proper fluidity helps to obtain impressions of fine structures and can be completely removed from the mouth. Its ph...

AI Technical Summary

Problems solved by technology

For example: 1. Mixing performance: Alginate is the main component of the impression material. It is a substance with high water absorption and high surface activity. In severe cases, it will affect the accuracy of model taking; 2. Storage problems: alginate is a natural polymer material, and it degrades very quickly under certain conditions, such as moisture absorption and variability in contact with divalent metal ions. Lose elasticity and tear resistance and be scrapped, so it has high requirements for storage conditions; 3. Moisture retention performance: the alginate impression material is placed in the air during the process of forming a mold from the mouth to making a denture according to the mold, during which it will The change in the size of the impression due to water loss cannot truly reflect the shape of the teeth and oral tissue when the plaster is poured, so the instructions of each product stipulate that it should not exceed 15 minutes, which makes the operator feel very inconvenient; 4 . Mechanical properties: another defect of alginate impression is poor tear resistance and elasticity; 5. Ease of use: traditional powdered alginate impression materials, because the powder itself contains air, so A small amount of air bubbles will inevitably be generated during the mixing process, which often leads to the failure of mold taking

However, due to the high water-absorbent resin contained in the formula, the impression material is easy to absorb water and requires high storage conditions, and it must be mixed with powder and water in an airtight container during use, which is extremely inconvenient to operate

[0010] The Chinese invention patent (application number 200710114317.8, published on November 9, 2007) discloses a high-strength dental alginate impression material. At the same time, one or more of xanthan gum, tragacanth gum, and sodium polyacrylate is added to the formula in a weight percentage of 0.01% to 1% of the impression material, although the available deformation Dental alginate impression material with a recovery rate of 98% and a compressive strength of 0.42-0.45Mpa. However, due to the strong hydrophilicity of xanthan gum and tragacanth gum, if water is directly added and the stirring is insufficient, The outer layer absorbs water and swells into micelles, which will prevent moisture from entering the inner layer, thereby affecting the function of the product, while sodium polyacrylate has metal ions with divalent or higher values ​​(such as aluminum, lead, iron, calcium, magnesium, zinc) The formation of its insoluble salt causes molecular cross-linking and gelation and precipitation, which accelerates the irreversibility of the product and increases the difficulty of the dentist's operation

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