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Development of biomimetic NiTi alloy: influence of thermo-chemical treatment on the physical, mechanical and biological behavior
Rupérez de Gracia, Elisa; Manero Planella, José María; Bravo González, Luis-Alberto; Espinar, Eduardo; Gil Mur, Francisco Javier
Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. BIBITE - Biomaterials, Biomecànica i Enginyeria de Teixits
A bioactive layer, free of nickel, has been performed for its greater acceptability and reliability in clinical applications for NiTi shape memory alloys. In the first step, a safe barrier against Ni release has been produced on the surface by means of a thicker rutile/anastase protective layer free of nickel. In the second step, a sodium alkaline titanate hydrogel, which has the ability to induce apatite formation, has been performed from oxidized surface. An improvement of host tissue–implant integration has been achieved in terms of Ni ions release and the bioactivity of the treated NiTi alloys has been corroborated with both in vitro and in vivo studies. The transformation temperatures (As, Af, Ms, and Mf), as well as the critical stresses (sß¿M), have been slightly changed due to this surface modification. Consequently, this fact must be taken into account in order to design new surface modification on NiTi implants.
Àrees temàtiques de la UPC::Enginyeria dels materials::Assaig de materials
Nickel-titanium alloys--Testing
Elasticity
Biomimetic materials
Materials--Testing
Bioactivity
NiTi alloy
Superelasticity
Shape memory effect
Biomimetic surfaces
Biomimètica
Elasticitat
Níquel -- Aliatges
Titani -- Aliatges
Assaigs de materials
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/publishedVersion
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