Journal
MATERIALS CHARACTERIZATION
Volume 106, Issue -, Pages 463-469Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2015.06.004
Keywords
Laser surface modification; Microstructure; Porous structure; Phase transformation
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Funding
- Ministry of Health and Welfare, Executive Yuan, Taiwan [MOHW104-TDU-M-112-000003]
- Taipei Medical University [TMU100-AE3-Y12]
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In this study, neodymium-doped yttrium orthovanadate (Nd:YVO4) as a laser source with different scanning speeds was used on biomedical Ti surface. The microstructural and biological properties of laser-modified samples were investigated by means of optical microscope, electron microscope, X-ray diffraction, surface roughness instrument, contact angle and cell cytotoxicity assay. After laser modification, the rough volcano-like recast layer with micro-/nanoporous structure and wave-like recast layer with nanoporous structure were generated on the surfaces of laser-modified samples, respectively. It was also found out that, an alpha -> (alpha + rutile-TiO2) phase transition occurred on the recast layers of laser-modified samples. The Ti surface becomes hydrophilic at a high speed laser scanning. Moreover, the cell cytotoxicity assay demonstrated that laser-modified samples did not influence the cell adhesion and proliferation behaviors of osteoblast (MG-63) cell. The laser with 50 mm/s scanning speed induced formation of rough volcano-like recast layer accompanied with micro-/nanoporous structure, which can promote cell adhesion and proliferation of MG-63 cell on Ti surface. The results indicated that the laser treatment was a potential technology to enhance the biocompatibility for titanium. (C) 2015 Elsevier Inc. All rights reserved.
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