Peón E, Domínguez C, Pérez H, Galván JC, Rodríguez OJA, Pavón JJ, Torres Y

Language: Spanish
References: 23
Page: 1-11
PDF size: 244.09 Kb.

ABSTRACT

Introduction: Titanium and some titanium alloys are considered to be the best materials for permanent implants, due to their excellent mechanical properties and resistance to corrosion in physiological environments, as well as their good biocompatibility and osseointegration.
Objective: Solve some of the most significant limitations of titanium implants: fatigue phenomena and biointerface failure.
Methods: Samples of cp titanium grade 4 with a porosity of 250-355 μm were obtained by space-holder technique (50 % vol. NH4HCO3 , 800 MPa and 1250 ºC for 2 h in high vacuum), achieving a good balance between rigidity and mechanical resistance of the material. The porous titanium substrates were then covered with hydroxyapatite obtained via sol-gel immersion, dried at 80 ºC and thermally treated at 450 ºC for 5 h in a vacuum. Phase formation, surface morphology, interfacial microstructure, infiltration capacity and cross-section of coatings, were assessed with various physicochemical analysis methods.
Results: Fourier transform infrared spectroscopy and X-ray diffraction analysis showed the crystallinity of the phase and the homogeneity in the chemical composition of the coating. Micromechanical evaluation and coating adherence (P-h curves and scratch resistance) revealed good adherence of the coating to the metallic substrate. The coating was found to be porous without any evidence of crack formation. The pores seem to be interconnected into a continuous network, a morphological characteristic enabling circulation of physiological fluid when the system is used for biomedical applications.
Conclusions: Satisfactory crystallinity and adhesion between the coating and the substrate suggest that the system is promising for application in the development of orthopedic implants.

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