Preparation process of multilayer-permeability and multilayer-strength false tooth

Abstract

The invention relates to the technical field of dental ceramics, in particular to a preparation process of a multilayer-permeability and multilayer-strength false tooth. The preparation method comprises the following steps: (1) mixing at least two kinds of zirconium oxide powder with different light transmittance according to different weight proportions to obtain mixed zirconium oxide powder withdifferent colors, paving the mixed zirconium oxide powder layer by layer in a sequence from dark to light, and then pre-pressing to obtain a multilayer light transmittance green body; (2) carrying out integral dry pressing and isostatic pressing molding on the multilayer light transmittance green body, presintering the multilayer light transmittance green body to obtain a multilayer zirconium oxide ceramic block, and cutting the multilayer zirconium oxide ceramic block to form a false tooth; and (3) soaking the false tooth in a staining solution, then taking out the false tooth, drying, and sintering to obtain the multilayer-permeability and multilayer-strength false tooth. The denture obtained by the method disclosed by the invention is natural and attractive in gradual change from the cutting end to the gingival end, and the strength from the cutting end to the gingival end is changed from 690-1200MPa, so that the damage to jaw teeth due to the fact that the zirconium oxide cuttingend is too hard is avoided.

Description

technical field [0001] The invention relates to the technical field of dental ceramics, in particular to a preparation process of a denture with multi-layer transparency and multi-layer strength. Background technique [0002] In prosthodontics, the problem of color reproduction is an important indicator that affects the aesthetics of restorations and teeth. The color of uncolored zirconia ceramics is mostly white to ivory, and the color of the prepared denture is single, which is difficult to meet the clinical requirements for complex colors sexual demands. [0003] At present, the preparation method of dental ceramics by most manufacturers of dental ceramic materials is generally to dissolve soluble rare earth salts in water or ethanol, then add zirconia powders of different permeability for stirring, and then pour them into a baking tray for drying. Then carry out ball milling and sieving to obtain small materials, and then mix the small powder materials with powders of d...

AI Technical Summary

Problems solved by technology

[0002] In prosthodontics, the problem of color reproduction is an important indicator that affects the aesthetics of restorations and teeth. The color of uncolored zirconia ceramics is mostly white to ivory, and the color of the prepared denture is single, which is difficult to meet the clinical requirements for complex colors sexual demands

[0003] At present, the preparation method of dental ceramics by most manufacturers of dental ceramic materials is generally to dissolve soluble rare earth salts in water or ethanol, then add zirconia powders of different permeability for stirring, and then pour them into a baking tray for drying. Then carry out ball milling and sieving to obtain small materials, and then mix the small powder materials with powders of different permeability in different proportions to obtain colored zirconia powders, and then carry out layered pressing according to the powder permeability levels, Isostatic pressing, pre-sintering, and multi-color zirconia blanks are obtained, so that the same batch of dental ceramic materials produced has only one color, and if different colors are required, the color of the powder small material should be controlled, and one color should be used The powder can only produce a single color corresponding to the produced zirconia green body. If the color is changed according to the Vita color guide, a variety of powder small materials need to be produced, so the production process is complicated and the preparation process is cumbersome.

And because its strength changes gradually, it is easy to cause the incisal end to be too hard or too sharp during the cutting and forming process, which will cause damage to the jaw teeth.