Dental opaque baked porcelain powder and particle size distribution method

Abstract

The invention discloses a dental opaque baked porcelain powder and a particle size grading method, and relates to the dental opaque baked porcelain powder, the particle size range of porcelain powder particles is 0.2-20 [mu] m, the weight ratio of the porcelain powder particles with the median diameter of 5-7 [mu] m is 60%, the weight ratio of the porcelain powder particles with the median diameter of 0.3-0.5 [mu] m is 20%, and the weight ratio of the porcelain powder particles with the median diameter of 5-7 [mu] m is 20%. And the weight ratio of the ceramic powder particles with the median diameter of 8-11 microns is 20%. The invention further relates to a particle size grading method of the dental opaque baked porcelain powder, the method comprises a preferable porcelain powder particle size grading scheme obtained through two-stage screening, the dental opaque baked porcelain powder obtained through particle size optimization meets the better gold-porcelain bonding performance, can facilitate plastic stacking forming of body porcelain layer porcelain powder, and is easy to prepare, low in cost and suitable for industrial production. And a contribution is made to the performance improvement of the opaque baked porcelain powder for the dental department.

Description

technical field [0001] The invention belongs to the technical field of dental restoration, and relates to a ceramic preparation technology for dental restoration, in particular to an opaque ceramic powder for dental use and a particle size grading method. Background technique [0002] Dental metal-porcelain restorations are composed of multi-layer ceramic materials attached to a metal matrix. According to the order of porcelain from the inside to the outside, they can be roughly divided into opaque porcelain layer, body porcelain layer (also called dentin layer) and enamel layer. Floor. The opaque porcelain powder is in direct contact with the metal, the body porcelain layer shapes the tooth shape, and the enamel layer protects the restoration. One side of the opaque porcelain powder is bonded to the metal coping, and the other side interacts with the body porcelain layer, so the opaque porcelain The layer is in a key position linking the top and the bottom. It not only nee...

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Problems solved by technology

[0004] In order to overcome the deficiencies in the background technology and solve the problem of dual-objective optimization of metal-ceramic bonding and porcelain powder stacking and shaping, the inventors have found that if the metal matrix and opaque porcelain materials are heated at high temperature, if the ceramics cannot be filled well after melting On the metal surface, the mechanical interlocking effect of the two materials will be weakened, and the bonding force of gold and porcelain will also be reduced; when the body porcelain is applied on the surface of the opaque porcelain layer, the super smooth surface is not easy to stack and shape the body porcelain materials, And too rough surface is not conducive to the push filling operation of body porcelain

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