| Summary: | The aim of the study was to qualitatively investigate the structure of the surface layer of TiO<sub>2</sub> on dental implants made of Ti-6Al-4V subjected to different manufacturing treatments. M (machined), B (Al<sub>2</sub>O<sub>3</sub>-blasted), E (HNO<sub>3</sub>\HF-etched), B + E and A (B + E + anodized) implants and a further group receiving the same treatments as the first group with the addition of a final decontamination with cold plasma were included in the study. Examination was performed using micro-Raman spectroscopy. The surface treatments evaluated did not achieve the formation of crystalline TiO<sub>2</sub>. The increase in the complexity of surface treatment produced a proportional increase in the thickness of amorphous TiO<sub>2</sub> oxide. In the B + E group, the plasma treatment enhanced the amorphous oxide thickness of TiO<sub>2</sub>. The other surfaces treated by plasma decontamination did not show a difference to the respective untreated ones. The investigated surface treatments did not change the crystalline cage of TiO<sub>2</sub> in Ti-6Al-4V implants but affected the thickness of the oxide layer. The biological response could be influenced by different oxide thicknesses. Additional information on superficial TiO<sub>2</sub> structural organization can be obtained by micro-Raman evaluation of dental implants. Dental implants with B + E + plasma and A superficial treatments allowed the maximum formation of the amorphous oxide thickness.
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