TORRES HERNÁNDEZ , Yadir

The Escuela Polit´ecnica Superior (EPS) from Universidad de Sevilla (US) is a higher education engineering center that aims to provide specific training and research in each area of knowledge from Science, Techology, Engineering and Maths (STEM), as well as the generation and transfer of knowledge. To be at the forefront of innovation, research...

Universities should generate and relay knowledge and, therefore, placing it at the service of society. In this context, the Higher Polytechnic School (Escuela Polit´ecnica Superior, EPS) of the University of Seville (US), Spain, with a great tradition in the industrial work, aims to train the students both as professional and researcher,...

Porous titanium is a metallic biomaterial with good properties for the clinical repair of cortical bone tissue, although the presence of pores can compromise its mechanical behavior and clinical use. It is therefore necessary to characterize the implant pore size and distribution in a suitable way. In this work, we explore the new use of...

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In this work, a simple protocol based on electrical impedance measures is implemented to detect changes on chemical composition, the microstructure (percentage and size of pores) and the surface modification treatments of metallic implants. The Hewlett-Packard 4395A Agilent impedance analyzer was employed for these measurements. Discs of...

En este trabajo se investiga el comportamiento a fractura y fatiga de dos grados de carburos cementados WC-Co con distintos contenidos de fase ligante y tamaño de carburo medio. La caracterización mecánica incluye la evaluación de la resistencia a flexión, la tenacidad de fractura, el límite de fatiga y la cinética de propagación de grietas...

Commercially pure titanium (c.p. Ti) and Ti6Al4V alloys are the most widely used metallic biomaterials in the biomedical sector. However, their high rigidity and the controversial toxicity of their alloying elements often compromise their clinical success. The use of porous β-Titanium alloys is proposed as a solution to these issues. In this...

En este trabajo, se evalúa la impedancia eléctrica de distintas muestras de titanio poroso modificadas superficialmente con un láser de femtosegundo; como método experimental para caracterizar la macroporosidad inherente al proceso de fabricación y el efecto del tratamiento superficial de los discos. El estudio se realiza sobre discos con...

In this work, a sequential compaction device has been successfully developed and implemented to produce commercially pure titanium cylinders, in which the porosity increases from the core to the surface or vice versa. The radial graded porosity (three concentric layers) have been obtained by conventional powder-metallurgy (PM) route and/or...

In this work porous commercially pure Ti substrates fabricated by spacer-holder technique (50 vol% NH4HCO3 and three range pores sizes, 100–200 μm, 250–355 μm and 355–500 μm) were coated with two types of gelatinous materials, one as a linear polymer (non-crosslinked) and another one crosslinked. The role of the crosslink, as well as the...

Junta de Andalucía (Spain) / FEDER (EU), through the project Ref. P12-TEP-1401

Los biomateriales como el titanio (Ti) c.p desempeñan un papel clave en el éxito actual de los procedimientos de implantes. En general, los implantes de Ti son biocompatibles y permiten el crecimiento óseo de manera ordenada, pero, en los cinco años posteriores a la implantación, 5-10% fracasan a raíz de una osteointegración deficiente. En este...

Macroporous titanium structures are of interest in bone reconstruction because of their reduced modulus of elasticity (compared to bulk titanium), possibility of being colonized by cells, and biocompatibility. However, they are not bioactive and are not able to actively facilitate bone ingrowth or reduce bacterial adhesion. In the present...

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Bone resorption events and consequent failure of titanium implants are frequently related to stress-shielding problems, due to stiffness mismatch with respect to bone. This is a mechanical incompatibility problem, which is difficult to resolve because of the challenge of replacing highly anisotropic biomechanical systems, as is the case of...