Casting embedding material for dental cast porcelain and preparation method of casting embedding material

Abstract

An embedding material for dental cast porcelain comprises a powder material and a liquid material, and the powder material is composed of the following components in percentage by mass: 10%-30% of ammonium dihydrogen phosphate, 35%-55% of quartz, 5%-25% of cristobalite, 3%-15% of magnesium oxide and 1%-20% of ammonium aluminum carbonate; the liquid material is a silica sol aqueous solution with the mass concentration of 20-50%. The preparation process of the powder material is as follows: under the condition that the humidity of a working environment is controlled to be less than 30%, the technological processes of raw material drying, raw material particle size matching, raw material mixing and the like are sequentially performed. Ammonium aluminum carbonate is added into a powder material, the ammonium aluminum carbonate is decomposed into amorphous aluminum oxide at about 400 DEG C to generate expansion, then is converted into gamma-aluminum oxide at about 600 DEG C to generate expansion, and finally reacts with magnesium oxide at about 800 DEG C to generate magnesium aluminate spinel to generate expansion again; the expansion coefficient of the embedding material is synergistically adjusted.

Description

technical field [0001] The invention relates to the field of dental treatment auxiliary materials, in particular to a casting embedding material for dental ceramic casting and a preparation method thereof. Background technique [0002] With the improvement of human living standards, people pay more and more attention to oral care, and teeth whitening is also more and more popular. Traditional tooth whitening mainly uses physical or chemical methods to remove tooth stains, plaque or pigment deposits on the surface of the teeth from the teeth, thereby restoring the original color of the teeth to achieve the whitening effect. But for more serious tetracycline teeth, dental fluorosis, discolored teeth, etc., the traditional whitening effect is not ideal. At present, the discolored teeth and tooth stains, dental plaque, pigment deposits, etc. on the surface of the teeth are covered by glass ceramic veneers, which has good aesthetic effects and high bending strength, and has been...

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Problems solved by technology

[0004] Aiming at the problem that the expansion rate of the existing metal-ceramic embedding material does not match that of glass ceramics for casting, the present invention proposes an embedding material for dental ceramic casting and its preparation method, mainly through component design and particle size of raw materials. Adjust the comprehensive expansion rate of the embedding material to match the shrinkage rate of glass ceramics

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