Preparation method for lithium-based glass ceramic for dental prosthesis

Abstract

The embodiment of the invention discloses a preparation method for lithium-based glass ceramic for dental prosthesis. The preparation method comprises: filling glass powder which is prepared in advance into a die, wherein the grain size of the glass powder is less than 50 microns; and pressing and moulding the powder under 50-500 Mpa to obtain a lithium-based glass ceramic blank; putting the lithium-based glass ceramic blank into a heating device to raise the temperature to 500-600 DEG C for first-time sintering at a temperature raising rate of 1-30 DEG C / min, wherein the insulating time of the first-time sintering is 10-120 minutes; and carrying out furnace cooling to prepare the lithium-based glass ceramic. Compared with lithium disilicate glass ceramic prepared in the prior art, the lithium-based glass ceramic prepared by the technical scheme is relatively low in strength, low in hardness, better in processability, more easy to mould and suitable for a processing room and a chair-side repairing system.

Description

technical field [0001] The invention relates to the technical field of dental restorations, in particular to a method for preparing lithium-based glass ceramics for dental restorations. Background technique [0002] The chairside restoration system is a dental restoration system formed by introducing computer-aided design and manufacturing into the field of dental restoration. [0003] The feature of the chairside prosthetic system is that it is convenient and fast. It breaks through the traditional denture manufacturing procedures such as grinding teeth, taking impressions, carving wax, and firing porcelain. When the dentist grinds the teeth and trims them, the images are captured directly with a 3D camera and immediately transferred to the computer. , the automatic porcelain block grinder processes porcelain blocks into dental restorations with the aid of a computer. [0004] Since the appearance of the chairside restoration system, the development of dental restoration m...

AI Technical Summary

Problems solved by technology

[0008] However, after the first step of crystallization in this molding method, the content of glass phase in the product is relatively high, and problems such as chipping and fracture are prone to occur during processing

[0009] When forming by high-temperature melting method, in order to clarify and homogenize the glass liquid, a higher melting temperature is required, and it needs to be kept at high temperature for a long time, so the energy consumption is large

[0010] Not only that, high temperature for a long time will easily volatilize elements such as phosphorus and fluorine in the lithium disilicate glass frit, and also easily lead to the reduction of Si-OH functional groups; 2 + relatively low solubility properties; these issues not only make the composition difficult to control, but also reduce the biological activity of the material

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