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Materials 2016, 9(6), 402; doi:10.3390/ma9060402

Development of Biomimetic NiTi Alloy: Influence of Thermo-Chemical Treatment on the Physical, Mechanical and Biological Behavior

1
Centre de Recerca Nanoenginyeria (CrnE), Departamento Ciencia de los Materiales e Ingeniería Metalúrgica, Escola Tècnica Superior d’Enginyeria Industrial de Barcelona (ETSEIB), Universidad Politécnica de Catalunya, Barcelona 08028, Spain
2
Unidad Docente de Ortodoncia, Facultad de Odontología, Universidad de Murcia, Murcia 30003, Spain
3
Department of Ortodoncia, Facultad de Odontología, Universidad de Sevilla, Sevilla 41009, Spain
4
Universidad Internacional de Cataluña, C/Immaculada 22, Barcelona 08195, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Erik Reimhult
Received: 6 April 2016 / Revised: 11 May 2016 / Accepted: 17 May 2016 / Published: 24 May 2016
(This article belongs to the Section Biomaterials)
View Full-Text   |   Download PDF [2055 KB, uploaded 24 May 2016]   |  

Abstract

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 (σβ⇔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. View Full-Text
Keywords: bioactivity; NiTi alloy; superelasticity; shape memory effect; biomimetic surfaces bioactivity; NiTi alloy; superelasticity; shape memory effect; biomimetic surfaces
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Rupérez, E.; Manero, J.M.; Bravo-González, L.-A.; Espinar, E.; Gil, F. Development of Biomimetic NiTi Alloy: Influence of Thermo-Chemical Treatment on the Physical, Mechanical and Biological Behavior. Materials 2016, 9, 402.

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