F Javier Gil1, Eduardo Espinar, Jose Maria Llamas, Pablo Sevilla. 1. Bioengineering Research Center (CREB), Department of Materials Science and Metalurgical Engineering, Universitat Politècnica de Catalunya, Barcelona, Spain; Facultad de Odontología, Universidad de Sevilla, Sevilla, Spain.
Abstract
OBJECTIVE: This study focuses on the fatigue behavior of titanium dental implants as-received, with a grit-blasted surface and with a new bioactive surface treatment (2Steps). BACKGROUND: The 2Step process consists of (1) an initial grit-blasting process to produce a micro-rough surface, followed by (2) a combined thermo-chemical treatment that produces a potentially bioactive surface, that is, that can form an apatitic layer when exposed to biomimetic conditions in vitro. The 2Step treatment produced micro-rough and apatitic coating implants. METHODS: Residual stresses were determined by means of X-ray diffraction. The fatigue tests were carried out at 37°C on 500 dental implants, and the S-N curve was determined. The fatigue-crack nucleation for the different treatments was analyzed. RESULTS: The fatigue tests show that the grit-blasting process improves the fatigue life. This is a consequence of the layer of compressive residual stresses that the treatment generates in titanium surfaces. Dental implants that had its surfaced prepared with the 2Step procedure (grit-blasting and thermo-chemical treatment) had its fatigue life decreased by 10% due to the incorporation of oxygen to the surface and the relaxation of the compressive residual stress produced by the heat treatment. CONCLUSIONS: Thermo-chemical treatment is an excellent compromise between the improvement of bioactive and mechanical long-life behaviors.
OBJECTIVE: This study focuses on the fatigue behavior of titanium dental implants as-received, with a grit-blasted surface and with a new bioactive surface treatment (2Steps). BACKGROUND: The 2Step process consists of (1) an initial grit-blasting process to produce a micro-rough surface, followed by (2) a combined thermo-chemical treatment that produces a potentially bioactive surface, that is, that can form an apatitic layer when exposed to biomimetic conditions in vitro. The 2Step treatment produced micro-rough and apatitic coating implants. METHODS: Residual stresses were determined by means of X-ray diffraction. The fatigue tests were carried out at 37°C on 500 dental implants, and the S-N curve was determined. The fatigue-crack nucleation for the different treatments was analyzed. RESULTS: The fatigue tests show that the grit-blasting process improves the fatigue life. This is a consequence of the layer of compressive residual stresses that the treatment generates in titanium surfaces. Dental implants that had its surfaced prepared with the 2Step procedure (grit-blasting and thermo-chemical treatment) had its fatigue life decreased by 10% due to the incorporation of oxygen to the surface and the relaxation of the compressive residual stress produced by the heat treatment. CONCLUSIONS: Thermo-chemical treatment is an excellent compromise between the improvement of bioactive and mechanical long-life behaviors.
Authors: Eugenio Velasco-Ortega; Antonio Flichy-Fernández; Miquel Punset; Alvaro Jiménez-Guerra; José María Manero; Javier Gil Journal: Materials (Basel) Date: 2019-11-12 Impact factor: 3.623
Authors: M Herrero-Climent; P López-Jarana; B F Lemos; F J Gil; C Falcão; J V Ríos-Santos; B Ríos-Carrasco Journal: Materials (Basel) Date: 2020-04-18 Impact factor: 3.623
Authors: Javier Gil; Román Pérez; Mariano Herrero-Climent; Maria Rizo-Gorrita; Daniel Torres-Lagares; Jose Luis Gutierrez Journal: Materials (Basel) Date: 2021-12-27 Impact factor: 3.623