Resumo

CATAO, Carmem Dolores de Sá et al. Bioactivity evaluation of laser treated NiTi alloys for dental application. RFO UPF [online]. 2014, vol.19, n.1, pp. 48-56. ISSN 1413-4012.

NiTi alloys are extensively used in devices for dentistry, as in Implantology, due to their biocompatibility properties, shape memory, and superelasticity. Objective: To assess bioactivity and morphological characteristics of NiTi alloy (45.3% Ni and 54.7% Ti), treated with laser and uncoated apatite. Materials and method: The NiTi alloys were obtained by the Plasma Skull Push-Pull process, superficially treated. The samples were treated with laser (Yb: YAG), and by the biomimetic method in SBF-0 and SBF-6 (Simulated Body Fluid), both with 1.5M. Bioactivity analysis was performed by weighing, Energy Dispersive X-Ray Spectroscopy (EDS), and Scanning Electron Microscopy (SEM). Results: Spectroscopies revealed an increase in the concentration of oxygen and carbon after ablation, favoring the dissemination of oxygen atoms, and the formation of titanium oxides. After the deposition of apatite by the biomimetic method in SBF-0 and 6, the coating showed a molar ratio of Ca/P of approximately 1.0, characterizing the formation of poor crystallinity apatites. Conclusion: The combination of laser irradiation and chemical deposition of apatites by the biomimetic method in SBF-6, although performing better in terms of bioactivity and topography of alloys, the mass gain was not statistically significant at the 5% level. Such properties may contribute to greater interaction of the biomaterial with biological environment and possible time reduction for osseointegration.

Palavras-chave : Laser.; Apatites.; Dental Implants.; Osseointegration..