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Minha trajetória na medicina UFSCar
(Universidade Federal de São Carlos, 2020-11-19) Angeli, Flávia Marcos de; Kishi, Renata Giannecchini Bongiovanni; https://lattes.cnpq.br/7651034212763580; https://lattes.cnpq.br/1482955088298436
The course conclusion work is an instrument used to describe the medical course at the University Federal of São Carlos, through narrative and theoretical basis. This synthesis can be performed by aggregating reflective portfolio records, contemplating the dimensions of teaching, assistance and research. This work was done in order to describe my trajectory in the medical course of the Federal University of São Carlos. This description will be through reflective narratives supported by theoretical framework. The beginning consists of a description of my trajectory before arrival at the university, and continues with a description of the educational units that were impactful and the importance of these experience for medical training.
Study of bioactivity, corrosion resistance and fatigue behavior of Ti-12Mo-6Zr-2Fe alloy after different surface treatments
(Universidade Federal de São Carlos, 2020-11-19) Escobar Claros, Cesar Adolfo; Campanelli, Leonardo Contri; https://lattes.cnpq.br/8983259236829248; Bolfarini, Claudemiro; https://lattes.cnpq.br/9231627080617037; https://lattes.cnpq.br/6878156171817208
Demand for new implants with improved bioactivity, corrosion resistance, and optimal mechanical properties has been increasing considerably. In this sense, different surface treatments are applied in titanium alloys to improve their osteointegration process. Nevertheless, the developments of new bioactive surfaces could cause a considerable reduction in fatigue and corrosion strength leading to catastrophic failures in clinical use. For these reasons, this work studied the biocompatibility, corrosion and fatigue performance of Ti-12Mo-6Zr-2Fe alloy treated with three different surface modifications, namely, chemical surface treatment (CST), nanotubes (Nt) and nanopores (NP). Samples were immersed in simulated body fluid (SBF) solution during different periods, 0, 1, 7, and 14 days. After 14 days immersed in SBF, samples with CST showed high hydroxyapatite (HAp) formation; Likewise, samples with Nt and NP exhibited lower and moderated HAP formation, respectively. In samples without surface treatment was not observed HAp formation. The electrochemical behavior was studied through polarization curves and electrochemical impedance spectroscopy (EIS). Samples with Nt and NP displayed higher corrosion resistance and lower passivation current (Ipass) compared with untreated samples, after 14 days of immersion in SBF; samples with CST showed the worst corrosion performance for all the surface conditions studied. Furthermore, within the framework of electrochemical investigations, EIS results of Nt and NP samples showed a characteristic behavior that could not be modeled by traditional equivalent circuits. Thus, it was proposed a two-channel transmission line model for analyzing this impedance results, leading to a successful fitting of the EIS data. Finally, was observed a reduction of the fatigue resistance in the samples treated with NP and CST, associated with hydrogen embrittlement processes, due to the pick-up of hydrogen during the respective surface treatments.