The low elastic mode titanium-zirconium dental implant material and its preparation method. The low elastic mode titanium-zirconium dental implant material has acicular and lamellar precipitation structures during the sintering and cooling process, which is conducive to obtaining good mechanical properties and biological compatibility properties of titanium-zirconium alloy. The preparation method includes the following steps: The titanium zirconium powder was mixed evenly according to a certain proportion, pressed and formed, and the temperature was raised to 800℃ in a protective atmosphere for heat preservation. Finally, the low elastic mode titanium zirconium dental implant material was obtained by vacuum sintering at 1200 ~ 1300℃. The relative density of the low elastic modulus titanium-zirconium alloy is 94.1% ~ 94.5%, the compressive strength varies from 1292.8 ~ 1498.5MPa, and the elastic modulus varies from 21.8 ~ 22.8GPa. When the strength is guaranteed, the elastic modulus is low, and the mechanical compatibility with the human upper and lower jaws is good. Good biocompatibility with oral epithelium and fibrous tissue; And the preparation method is simple, it is a relatively ideal low elastic mold dental implant material.
Titanium metal has good wear resistance, corrosion resistance, and no reaction with human body fluids, no stimulation to the body tissue, and has excellent mechanical properties, is an ideal replacement material for human tissue. Titanium has been used in clinical practice for several decades, and its products include dental crowns, artificial bones, artificial heart valves, etc. Among the elements compatible with titanium, zirconium is not only non-toxic, but also has outstanding corrosion resistance. The oxide film formed on the surface of titanium and titanium is a closely bonded rutile structure, which has a great protective effect on the alloy located at the lower part of the alloy, showing high stability and corrosion resistance. At the same time, zirconium and titanium are the same subgroup elements, belonging to the hexagonal crystal system. The chemical properties are similar, the biological compatibility is very good, in high temperature β phase and low temperature α phase have complete solid solubility.
Although titanium and titanium alloys show excellent properties in mechanical properties and corrosion resistance, traditional titanium alloys generally have high elastic modulus. At present, the most widely used alloy Ti-6Al-4V even contains Al and V elements with toxic side effects. Although tantalum zirconium alloy has excellent corrosion resistance and good biocompatibility, low elastic modulus cannot guarantee its strength to meet the requirements of dental implant materials, and tantalum is very expensive. With zirconium as the main alloy element, titanium-zirconium alloy has excellent mechanical properties and biocompatibility. Compared with tantalum zirconium alloy, titanium-zirconium alloy has an elastic modulus closer to human bone on the premise of ensuring strength, which is more suitable for the development of medical materials, especially oral implant materials.
