The current metallic biomaterial still presents failures associated with the bulk alloy and the interface of material/human body. In previous studies, titanium alloy with tantalum showed the elastic modulus decrease in comparison with that of commercially pure (cp) titanium. In this study, surface modification on Ti-30Ta alloy was investigated. Titanium and tantalum were melted, homogenized, cold-worked by a rotary swaging process and solubilized. The anodization process was performed in electrolyte contained glycerol + NH4F 0.25% at 30 V using seven different durations—4 h, 5 h, 6 h, 7 h, 8 h, 9 h, and 10 h and annealed at 530 °C for 1 h. The surface topography was characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM) measurements, X-ray diffraction analysis (XRD), and contact angle. From the results, we conclude the time of anodization process influences the shape and morphology of the anodized layer. The 5 h-anodization process produced a smooth and porous surface. The 4-, 6-, 7-, 8-, 9-, and 10-h conditions showed nanotubes morphology. All surfaces are hydrophilic (<90°). Likewise, all the investigated conditions present anatase phase. So, this surface modification presents potential for biomedical application. However, more work needs to be done to better understand the influence of time on the anodization process.

Nowadays, new methodologies have been used to complementing and assisting in the fixation of knowledge. So, the aim of this work was apply a active education methods using a study case methodology to assess the critical competence in objective and subjective assessments and self-assessment, and to analyze the results obtained in a qualitative way. Students developed content, presented seminars, evaluate their peers objectively (assigning grades) and subjective (selecting according to preference) and also performed the self-assessment. Based on the grades attributed by the students, the ability to evaluate by peers by comparing variances was evaluated. From the results obtained, we can conclude that there is a mutual influence on the two types of evaluations used in this research. Students were able to evaluate their peers and also self-evaluation. There is consistency between different evaluators and also when compared to self-criticism. From the research on the experience of active teaching, it is possible to observe the growing preference of students for this teaching methodology.

The hydroxyapatite calcium phosphate based ceramic (Hap) is widely used for bone repair, as it is a biocompatible biomaterial and because it has osteoconductive and osteoinductive properties. However, the low mechanical strength of Hap may limit its applicability. Thus, the present work aims to improve the mechanical properties of Hap, associating it with alumina (Al2O3), using the powder metallurgy technique, which consists in the milling of the precursor powders in a planetary ball mill, uniaxial pressing and sintering. The microstructure and mechanical strength of the sintered samples were evaluated using density, microhardness, compressive strength and wettability tests. It was concluded that the use of Al2O3 in the composite improves the mechanical properties of Hap, while decreases its hydrophilic potential. Thus, the composition with 40% Hap / 60% Al2O3 was considered the best for biomedical applications.

During the last decades, researchers have been growing the interest in surface treatment with an antimicrobial agent. Silver nanoparticles (AgNPs) are widely used in biomedical fields due to their potent antimicrobial activity. So, in this study was investigated silver particles (isles) coated on titanium surface for dental and orthopedic application. Silver particles coating process on titanium surface were performed via sputtering that is a plasma-assisted deposition technique with and titanium without treatment was applied as comparing standard. Plasma treatment parameters were optimized so that the result was not a thin film of Ag but dispersed particles of Ag on the Ti-cp surface. The alloy surfaces were investigated using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). In order to investigate antibacterial potential Staphylococcus aureus and Escherichia coli have been used at Agar diffusion assay. The results were analyzed by analysis of variance (ANOVA) in order to verify significant difference antimicrobial activity between samples that have shown no difference between the surfaces studied treatments. For silver deposition scattered particles (isles) over titanium surface for a 10-minute treatment, EDS revealed by silver clusters that the particles were not properly scattered onto surface, hence, the low effectiveness in antibacterial activity.

O mercado global de implantes dentários estima o valor de US $ 13,01 bilhões até 2023 contra US $ 9,50 bilhões em 2018. O estudo dos materiais para a fabricação dos implantes tem aumentado com o objetivo de estender a vida útil do material evitando sua substituição. Assim, neste estudo investigamos o comportamento eletroquímico de corrosão, molhabilidade e atividade antimicrobiana do titânio e da liga binária Ti-30Ta. O titânio foi cortado em discos de 10 mm de diâmetro. A liga Ti-30Ta foi obtida a partir de titânio e tântalo em forno a arco voltaico, homogeneizada em vácuo a 1000ºC por 24 horas, trabalhada a frio e solubilizada a 950 ºC por 2 horas seguido de resfriamento em água . Em seguida, as barras foram cortadas em discos. Os testes de resistência à corrosão avaliaram o comportamento eletroquímico, a molhabilidade das superfícies do substrato foi investigada usando o método da gota séssil e a formação de biofilme foi investigada por de S epidermidis. Este estudo tem como objetivo investigar a resistência à corrosão do Ti cp e da liga Ti-30Ta em solução eletrolítica NaCl 0,15M + NaF 0,03M e formação de biofilme testado. Pelos resultados obtidos concluímos que o comportamento eletroquímico de ambas as superfícies apresenta boa resistência à corrosão e comportamento hidrofílico (< 90 °). No entanto, a liga Ti-30Ta diminui a adesão da bactéria S epidermidis.