A surface treatment method for slm-shaped titanium implants

Abstract

The invention discloses a method for treating the surface of an SLM-molded titanium implant, which comprises the following steps: SLM forming the titanium implant; sandblasting: using corundum or titanium dioxide to sandblast the surface of the SLM-molded titanium implant; pickling to remove impurities: The SLM-shaped titanium implants after sandblasting are placed in pickling solution for pickling treatment; alkali heat treatment: the SLM-shaped titanium implants after pickling treatment are placed in alkaline solution for hydrothermal treatment; calcification treatment: calcium salt The solution is a cation-exchange solution, and the SLM-shaped titanium implant after alkali heat treatment is placed in a cation-exchange solution at 100-200°C for hydrothermal treatment for 1-5 hours; after each step, the SLM-formed titanium implant is placed in acetone, 95 % ethanol and deionized water were ultrasonically cleaned and dried. The invention not only has simple steps and is easy to operate, but also constructs the surface of the SLM-formed titanium implant with a micro-nano hierarchical structure, and effectively improves the surface roughness, micro-morphology, mineralization characteristics and biological activity of the SLM-formed titanium implant.

Description

technical field [0001] The invention relates to the technical field of surface treatment of biomedical metal implant materials, in particular to a method for surface treatment of SLM formed titanium implants. Background technique [0002] With the development of medicine and 3D printing technology, titanium artificial implants using titanium powder selective laser melting stereolithography (SLM) are increasingly used to treat bone tissue lesions and repair defects, such as dental implants, Artificial joints, and bone internal fixation devices, etc. It makes the clinical treatment rise from the primary simple "repair" treatment to a higher level - bone tissue "replacement" treatment, thereby greatly improving people's quality of life. An ideal SLM laser rapid prototyping titanium-based bone implant should perform its corresponding physiological functions in the form of tight integration with bone tissue (Osseointegration). However, a considerable part of SLM laser rapid prot...

AI Technical Summary

Problems solved by technology

Chinese patent (application number) CN201410093637.X discloses a method for preparing a calcium-phosphorus-silver nanotube array on the surface of medical titanium. On the surface of the titanium matrix, the diameter of the tube is also limited to the nanometer range, and the interface with the surrounding bone tissue is limited to a certain extent.

[0005] Titanium implants currently in commercial use lack an ideal micro-nano composite surface microstructure, and there are problems such as unsatisfactory surface hydrophilicity. At the same time, the preparation effect of its surface activation components is not ideal, which affects its interface stability.

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