Beige tooth microcrystalline glass compounded by frits of wollastonite and apatite

Abstract

The invention discloses a beige tooth microcrystalline glass compounded by frits of wollastonite and apatite. The beige tooth microcrystalline glass is prepared through a sintering method after smashing and mixing white microcrystalline glass frits in a single wollastonite crystalline phase and beige microcrystalline glass frits in a single apatite crystalline phase, the bending strength of the prepared material is less than or equal to 80 Mpa, the Vickers hardness tested by an FM-700 type microhardness tester is less than or equal to 5.80 GPa (HV 0.5). According to the invention, through the adjustment of frit composition proportion and the mixing ratio of the two types of frits, microcrystalline glass similar to teeth of different crowds in color can be prepared; under the premise that the constituent ratio in a unitary system is not needed to be adjusted, the mechanical property and the color of the microcrystalline glass can be adjusted through changing the mixing ratio of the mixing frits,; the preparation technology requirements are low; industrialized popularization and application are facilitated.

Description

technical field [0001] The present invention relates to the field of inorganic non-metallic materials, especially glass-ceramics for medical use in teeth, specifically biological glass ceramics containing apatite (A, apatite) and wollastonite (W, wollastonite) crystalline phases (abbreviated as AW biological active glass-ceramics). Background technique [0002] AW bioactive glass-ceramics is a new type of material with excellent performance developed in recent years. As a medical implant, this type of material can form a close chemical combination with natural bone, and is widely used in clinical bone replacement repair materials. , bone defect filling materials, etc. [0003] In 1982, Kokubo and others in Japan developed AW bioactive glass-ceramic containing apatite, wollastonite crystal phase and glass phase by melting method. It has good biocompatibility and is safe and non-toxic after the product is implanted in the body. , No rejection and other adverse reactions, wit...

AI Technical Summary

Problems solved by technology

Although this technology overcomes the defects in the preparation of AW bioactive glass-ceramics by the melting method, it is because all the components are mixed together to prepare a sol during the preparation, and the sol is aged, dried, pre-fired, and made into a sol. Granulation, molding, and high-temperature sintering to obtain finished products, that is to say, wollastonite and apatite crystal phases are prepared in the same formula and at the same time; the resulting defects: first, the performance of the final product is poorly controllable, Once the performance of the product does not meet the requirements, it needs to be re-prepared, and the risk is greater; second, the process requirements are relatively strict. If the distribution ratio of a certain group needs to be adjusted, the ratio of the entire system will have to be adjusted, which will affect the whole body, which is not conducive to industrialization. promotion and application; the third is: when using this method to prepare glass-ceramics for teeth, the mechanical properties of the final product cannot be adjusted in time, and there is no color, so it cannot be used by different groups of people

The disadvantages of this process are: because the molded body is formed by pressing or bonding multiple intermediate molded bodies of different colors and then sintered, the technology has the following defects: First, when used as a dental restoration material , because the color of each person's teeth is different, even the same person's teeth also have color differences, which leads to the need to prepare an indefinite number of intermediate moldings in advance, and then arrange and shape multiple moldings according to the required gradient changes. The process is complicated , it is difficult to be used as a dental restoration material in reality; second, the interface between the intermediate moldings is a weak link, and the compatibility of the two materials at the interface is poor, resulting in a performance gradient change at the interface of the final molding. Like a cracked bowl, sintered together by adhesives and pre-made into a whole and then sintered, the properties of the final product are not uniform

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