Layered zirconia porcelain block technology with even contraction of all layers

Abstract

The invention belongs to the field of oral cavity materials and particularly relates to a layered zirconia porcelain block technology with even contraction of all layers. By adopting the technical scheme, according to the required colors, the component and content of zirconia powder formulas of all the layers are determined, and zirconia porcelain blocks of all the layers comprise shallowest layers, transition layers and deepest layers; according to the content of yttria in all the formulas, the particle diameter distribution of zirconia and yttria in the shallowest layers and the deepest layers is adjusted, so that it is guaranteed that the contraction rate diversity factor of the shallowest layers and the deepest layers after sintering is smaller than 0.3%; the adjusted shallowest layersand deepest layers are evenly mixed to obtain the transition layers; the shallowest layers, transition layers and deepest layers are placed layer by layer according to the color shade sequence and subjected to isostatic pressing, pre-sintering and high-temperature sintering, and preparation is completed. By adopting the technical scheme, the layered zirconia porcelain block with natural colors, natural penetrability transition and a basically-constant contraction rate can be obtained.

Description

technical field [0001] The invention belongs to the field of oral cavity materials, and in particular relates to a layered zirconia ceramic block technology with uniform shrinkage of each layer. Background technique [0002] Zirconia ceramics is a kind of bioceramic material, which belongs to the category of green economy. Because of its good biocompatibility, excellent mechanical properties and realistic tooth-like optical effects, it is known as the ideal denture restoration in the 21st century. one of the materials. [0003] With the improvement of people's living standards and the enhancement of health awareness, demetallization of oral denture restoration has become a development trend, and all-ceramic restoration has been praised by more and more doctors and patients. However, if the color and transparency of all-ceramic materials are not improved, the upper and lower dentures will have almost the same color and transparency, which will be very abrupt after installati...

AI Technical Summary

Problems solved by technology

Although this method can effectively avoid the problem of secondary processing of the sintered zirconia ceramic block, the obtained zirconia ceramic block is still single in color and transparency, and cannot present a natural transition effect

[0004] If multiple layers of zirconia raw material powders with different colors and transparency are used for compounding, pressing, and sintering, although it seems theoretically possible to obtain a zirconia ceramic block with a natural transition in color and transparency, in practice, due to the use of each layer There are differences in powder formulations, resulting in different final sintering shrinkage rates of each layer of porcelain blocks after pre-sintering

When sintering at a high temperature of 1500-1550°C to prepare long bridge teeth, the bridge deformation is prone to occur, which directly leads to the scrapping of the obtained zirconia ceramic block

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