Residual Stress Homogenization of Hybrid Implants

doi:10.3390/bioengineering11111149

★ Alto impactoQ1 · EngineeringImpact Factor · 4.791

AutoresMarta Sanjuán Álvarez, Daniel Robles, Javier Gil, Saray Férnandez-Hernández, Esteban Pérez-Pevida, Aritza Brizuela‐Velasco

Por qué importa

Este estudio explora cómo un tratamiento térmico de recocido puede mejorar las propiedades de los implantes híbridos. Se investigó la influencia de este tratamiento en la homogeneización de las tensiones residuales entre las superficies lisa y rugosa de los implantes, buscando mitigar la disminución en la resistencia a la corrosión y la fatiga que suelen presentar. Los resultados indican que el tratamiento propuesto logra una distribución más uniforme de las tensiones, mejorando la fatiga y la resistencia a la corrosión. Aunque los implantes tratados muestran un rendimiento inferior a los de superficie rugosa, el tratamiento de recocido se presenta como una vía para optimizar las características mecánicas y de corrosión en implantes de superficie híbrida, lo cual es relevante para la durabilidad y el éxito a largo plazo de las rehabilitaciones implantosoportadas.

Abstract original

Objectives: Hybrid implants commonly exhibit decreased corrosion resistance and fatigue due to differences in compressive residual stresses between the smooth and rough surfaces. The main objective of this study was to investigate the influence of an annealing heat treatment to reduce the residual stresses in hybrid implants. Methodology: Commercially pure titanium (CpTi) bars were heat-treated at 800 °C and different annealing times. Optical microscopy was used to analyze the resulting grain growth kinetics. Diffractometry was used to measure residual stress after heat treatment, corrosion resistance by open circuit potential (EOCP), corrosion potentials (ECORR), and corrosion currents (ICORR) of heat-treated samples, as well as fatigue behavior by creep testing. The von Mises distribution and the resulting microstrains in heat-treated hybrid implants and in cortical and trabecular bone were assessed by finite element analysis. The results of treated hybrid implants were compared to those of untreated hybrid implants and hybrid implants with a rough surface (shot-blasted). Results: The proposed heat treatment (800 °C for 30 min, followed by quenching in water at 20 °C) could successfully homogenize the residual stress difference between the two surfaces of the hybrid implant (−20.2 MPa). It provides better fatigue behavior and corrosion resistance (p ˂ 0.05, ANOVA). Stress distribution was significantly improved in the trabecular bone. Heat-treated hybrid implants performed worse than implants with a rough surface. Clinical significance: Annealing heat treatment can be used to improve the mechanical properties and corrosion resistance of hybrid surface implants by homogenizing residual stresses.

Leer texto completo ↗DOI · 10.3390/bioengineering11111149

Autores Doctor&Cols

Cómo citar

Álvarez MS, Robles D, Gil J, Férnandez-Hernández S, Pérez-Pevida E, Brizuela‐Velasco A. Residual Stress Homogenization of Hybrid Implants. Bioengineering. 2024. doi:10.3390/bioengineering11111149