Enhanced cellular responses to titanium coating with hierarchical hybrid structure

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Surface Chemistry

Background:

• Plasma-sprayed porous titanium coatings (TC) offer mechanical fixation and stability for implants.
• Enhancing the biological response of implant surfaces is crucial for successful osseointegration.
• Hierarchical surface structures can improve cell interactions with biomaterials.

Purpose of the Study:

• To prepare and characterize a nano/micro hierarchical hybrid structured surface on titanium coating (HSTC).
• To evaluate the in vitro biological properties of HSTC using human marrow stem cells (hMSCs).
• To assess the potential of HSTC as a candidate for hard tissue replacements.

Main Methods:

• Fabrication of a titania nanotube layer on plasma sprayed porous titanium coating (TC).
• In vitro evaluation of hMSC adhesion and proliferation on the hierarchical structured titanium coating (HSTC) and as-sprayed TC.
• Assessment of osteogenic marker expression (osteocalcin and osteopontin) on both surfaces.

Main Results:

• HSTC exhibited approximately 30% greater hMSC adhesion compared to the as-sprayed TC.
• Expressions of osteocalcin (OC) and osteopontin (OPN) were approximately doubled on HSTC versus TC.
• Enhanced protein adhesion, attributed to increased surface area and energy, explains improved cell responses.

Conclusions:

• The nano/micro hierarchical hybrid structured titanium coating (HSTC) significantly promotes hMSC adhesion and osteogenic differentiation.
• HSTC offers improved biological performance over conventional plasma-sprayed titanium coatings.
• HSTC is a promising candidate for hard tissue replacements, particularly for load-bearing implants.