Preparation method for veneering porcelain used for alumina all-ceramic crown

Abstract

The invention relates to the technical field of preparation of rare metal materials, specifically to a preparation method for veneering porcelain used for an alumina all-ceramic crown. The preparation method comprises the following steps: weighing a variety of compounds by using an electronic balance and respectively converting the amounts of desired B2O3, K2O, Na2O and CaO into the amounts of H3BO3, K2CO3, Na2CO3 and CaCO3; adding raw materials into deionized water and carrying out ball milling; drying slurry, putting dried slurry into an alumina crucible, delivering the alumina crucible into an electric furnace, carrying out heating, taking out a melt and pouring the melt into cold water for cold quenching; grounding glassy mass obtained after quenching and carrying out sieving with sieve with a bore diameter of 61 [mu]mm so as to obtain baked porcelain powder; weighing 0.2 g of the baked porcelain powder, uniformly blending the baked porcelain powder with deionized water, smearing an alumina ceramic bottom crown with the obtained mixture, delivering the alumina ceramic bottom crown to the electric furnace for heating and carrying out cooling to room temperature in the furnace; and carrying out sintering so as to form the veneering porcelain with a thickness of about 1.5 mm. The microstructure of the baked porcelain powder obtained after sintering is microcrystalline glass, and the thermal expansion coefficient of the baked porcelain powder is 7.2 * 10 <-6> / K. The baked porcelain powder and alumina ceramic have good thermal matching performance; and thermal shock resistance temperature reaches 240 DEG C.

Description

technical field [0001] The invention relates to the technical field of preparation of rare metal materials, in particular to a method for preparing decorative porcelain for alumina all-ceramic crowns. Background technique [0002] With the continuous development of science and technology and the improvement of people's living standards, dental restoration materials have received more and more attention. All-ceramic restorations with better biocompatibility and aesthetic performance have become the main development trend of dental fixed restorations. one. All-ceramic restorations generally use glass-infiltrated alumina and other high-strength ceramic materials to prepare the bottom crown, and the surface is coated with special porcelain powder, which is sintered at the temperature of porcelain to form a decorative porcelain similar to tooth enamel, so that the all-ceramic restoration has The color and luster comparable to real teeth, to achieve the purpose of real ones. Por...

AI Technical Summary

Problems solved by technology

At present, the porcelain powders for all-ceramic crowns produced by foreign companies have good performance in terms of performance and aesthetics, but their prices are generally expensive, which limits their further development in the domestic market