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Blood Coagulation on Titanium Dioxide Films with Various Crystal Structures on Titanium Implant Surfaces.

Her-Hsiung Huang1,2,3,4,5,6, Zhi-Hwa Chen2, Diem Thuy Nguyen1

  • 1Department of Dentistry, National Yang Ming Chiao Tung University, Taipei 112, Taiwan.

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The crystal structure of titanium dioxide (TiO2) on titanium implants significantly impacts blood coagulation. Rutile structures enhance factor XII activation, fibrin formation, and platelet adhesion, crucial for implant integration.

Keywords:
blood coagulationcrystal structuredielectric constanttitanium dioxidetitanium implant surface

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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Biomedical Engineering

Background:

  • Titanium (Ti) and its titanium dioxide (TiO2) surface are widely used for implants due to biocompatibility.
  • Understanding blood coagulation on TiO2 surfaces is vital for implant success but remains incompletely understood.
  • The influence of TiO2 crystal structure on blood interactions requires further investigation.

Purpose of the Study:

  • To investigate the effect of different TiO2 crystal structures (anatase, rutile, mixed) on blood coagulation.
  • To elucidate the mechanisms by which TiO2 surface properties influence coagulation factors and cell adhesion.
  • To correlate TiO2 crystal structure with specific blood coagulation events.

Main Methods:

  • Fabrication and characterization of TiO2 thin films (< 50 nm) with varying crystal structures.
  • Surface analysis using atomic force microscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy.
  • Measurement of surface energy and dielectric constant, followed by assessment of clotting time, factor XII activation, fibrinogen adsorption, fibrin attachment, and platelet adhesion.

Main Results:

  • TiO2 films exhibited comparable surface roughness, thickness, and surface energy.
  • Rutile crystal structures demonstrated a higher dielectric constant compared to anatase.
  • Higher dielectric constant correlated with increased factor XII activation, fibrin network formation, and platelet adhesion.

Conclusions:

  • TiO2 crystal structure, specifically the presence of rutile, significantly influences blood coagulation on titanium implant surfaces.
  • The dielectric properties of TiO2 surfaces play a critical role in initiating blood coagulation cascades.
  • Findings provide insights into tailoring TiO2 surface properties for improved Ti implant performance.