Korean J Dent Mater.  2023 Dec;50(4):233-245. 10.14815/kjdm.2023.50.4.233.

Evaluation of the antimicrobial activity of the photofunctionalized Ni-Ti-O nanotubes

• Moon KS
• Oh S
• Choi EJ

• KMID: 2550710
• DOI: http://doi.org/10.14815/kjdm.2023.50.4.233

Abstract

Ni-Ti-O nanotubes have the potential for visible light-mediated light absorption and photocatalysis due to their low energy band gap. However, their photocatalytic-based antibacterial activity under visible light irradiation is still unclear. This study aims to analyze the photocatalytic-based optical properties of Ni-Ti-O nanotubes and evaluate their antibacterial activity. From the FE-SEM observations of the Ni-Ti-O nanotubes, clean and homogeneous nanotubes with a length of 600 ± 80 ㎚ and an outer diameter of 52 ± 5 ㎚ were observed. The diffuse reflection analysis of the Ni-Ti-O nanotubes showed a photocatalytic bandgap, which is equivalent to the wavenumber of 450 nm, indicating that they exhibit photocatalytic effects in the visible light range. The CFU antibacterial test and SOD enzyme activity test using Streptococcus sanguinis showed that the Ni-Ti-O nanotube experimental group under 470 nm visible light irradiation exhibited statistically significant antibacterial activity compared to other experimental groups (P< 0.05). Therefore, the combination of Ni-Ti-O nanotubes and visible light-based photofunctionalization is expected to improve the antibacterial ability of NiTi implant materials in the dental field.

Keyword

NiTi ally; Ni-Ti-O nanotubes; Visible light mediated antibacterial effect