Polycrystal zirconium oxide ceramic dental material and preparation thereof

Abstract

The invention relates to a polycrystalline zirconia ceramic tooth post material and a preparation method thereof, belonging to the technical field of preparation of ceramic materials. It is characterized in that: the material contains zirconia ceramic powder as the initial raw material, a polymer binder, and a low-molecular additive, and the proportion thereof is: 80-90wt% of zirconia ceramic powder, 5-10wt% of polymer binder, 5-10wt% of low-molecular additives. The preparation method includes four steps of mixing and granulation, injection molding, thermal degreasing and sintering. The thermal degreasing temperature is 500-800°C, and the sintering temperature is 1350-1550°C. The organic binder system for injection molding of the present invention has good fluidity and high density of the molded green body, and the density of the ceramic product after sintering is greater than 6.0 g / cm 3 ;The sintering shrinkage and deformation of the formed green body are small, which ensures the dimensional accuracy of the product; the bending strength of the prepared ceramic tooth post is greater than 600MPa, and the fracture toughness is as high as 13MPa.m 1 / 2 , elastic modulus 140MPa, Vickers hardness 1050 ~ 1200MPa. The preparation process has good repeatability and is convenient for industrialized production.

Description

technical field

[0001] The invention relates to a polycrystalline zirconia ceramic tooth post material and a preparation method thereof, belonging to the technical field of preparation of ceramic materials. Background technique

[0002] A dental post is a commonly used dental material in dental restorations. The currently used dental post materials mainly include metal and inorganic fiber reinforced resin, such as stainless steel dental post and carbon fiber reinforced resin dental post. Although metal dental posts have good strength and toughness, potential corrosion and ion dissolution will jeopardize the reliability of dental posts. However, fiber-reinforced resins are prone to aging, and their durability and reliability are also affected. In addition, the color of these two types of post materials is very different from that of human teeth, and it will appear dark gray in ceramic crowns, which will affect the aesthetic effect of ceramic teeth.

[0003] The above-menti...