Bioactive TiNbSn alloy prepared by anodization in sulfuric acid electrolytes
N Masahashi1, Y Mori2, H Tanaka2
1Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba, Sendai, Miyagi 980-8577, Japan.
Anodizing titanium niobium tin (TiNbSn) alloy in sulfuric acid promotes hydroxyapatite (HA) formation for enhanced osseointegration. This method yields bioactive anodic titanium dioxide (TiO2) without further treatment, maintaining a low Young
Area of Science:
- Biomaterials Science
- Materials Science
- Orthopedic Research
Background:
- Near-beta TiNbSn alloys are investigated for orthopedic implants due to their low Young's modulus.
- Understanding the bioactivity of surface modifications is crucial for improving osseointegration.
- Anodic oxide layers play a significant role in the interaction between implants and bone tissue.
Purpose of the Study:
- To investigate the bioactivity of anodized TiNbSn alloy prepared in sulfuric acid electrolytes.
- To elucidate the osseointegration mechanism focusing on the role of the anodic oxide layer.
- To compare the properties of anodic oxides formed in sulfuric acid versus acetic acid electrolytes.
Main Methods:
- Anodization of TiNbSn alloy in sulfuric acid electrolytes.
- Immersion of anodized samples in Hank's solution to assess hydroxyapatite (HA) precipitation.
- Characterization of the anodic oxide layer's structure, including porosity and crystallinity (TiO2).
- Evaluation of the alloy's Young's modulus after anodization.
Main Results:
- Hydroxyapatite (HA) precipitated on the anodic oxide surface in Hank's solution, with precipitation rate increasing with sulfuric acid concentration.
- HA formation occurred on as-anodized oxide without post-treatment (annealing or hot water), unlike previous studies using acetic acid.
- Sulfuric acid anodization produced a thick, highly crystallized TiO2 layer with significant internal pores, promoting bioactivity and maintaining low Young's modulus.
Conclusions:
- Sulfuric acid electrolyte is superior for inducing HA formation and maintaining the low Young's modulus of TiNbSn alloy.
- The bioactive anodic TiO2 layer formed in sulfuric acid facilitates bone ingredient incorporation, enhancing osseointegration.
- This anodization method offers a simplified approach to creating bioactive surfaces for orthopedic implants.
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