Functionalization of an experimental Ti-Nb-Zr-Ta alloy with a biomimetic coating produced by plasma electrolytic oxidation

Cordeiro, Jairo M.; Nagay, B; Ribeiro, Ana Lúcia Roselino; Cruz, Nilson Cristino da; Rangel, Elidiane Cipriano; Fais, Laiza Maria Grassi; Vaz, Luís Geraldo; Barão, Valentim Adelino Ricardo

doi:10.1016/j.jallcom.2018.08.154

Cited by 72 publications

(40 citation statements)

References 43 publications

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“…In this regard, considerable attention is currently being paid to methods for forming coatings containing calcium phosphate compounds [12,[23][24][25]. Among these methods, plasma electrolytic oxidation (PEO) can be distinguished, which allows one, due to varying the electrolyte composition and formation modes, to significantly change the composition and structure of the synthesized surface layer [26][27][28][29][30][31][32][33][34][35][36][37][38][39]. Thus, Ahounbar et al formed biocompatible coatings on titanium scaffolds using calcium acetate and trisodium phosphate electrolytes [37].…”

Section: Introductionmentioning

confidence: 99%

Bioactive Coatings Formed on Titanium by Plasma Electrolytic Oxidation: Composition and Properties

et al. 2020

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Bioactive coatings on VT1-0 commercially pure titanium were formed by the plasma electrolytic oxidation (PEO). A study of the morphological features of coatings was carried out using scanning electron microscopy. A composition of formed coatings was investigated using energy-dispersive spectroscopy and X-ray diffractometry analysis. It was shown that PEO-coatings have calcium phosphate in their composition, which increases the bioactivity of the surface layer. Electrochemical properties of the samples were studied by potentiondynamic polarization and electrochemical impedance spectroscopy in different physiological media: simulated body fluid and minimum essential medium. The data of electrochemical studies indicate more than 15 times decrease in the corrosion current density for the sample with coating (5.0 × 10−9 A/cm2) as compared to the bare titanium (7.7 × 10−8 A/cm2). The formed PEO-layers have elastoplastic properties close to human bone (12–30 GPa) and a lower friction coefficient in comparison with bare metal. The wettability of PEO-layers increased. The contact angle for formed coatings reduced by more than 60° in comparison with bare metal (from 73° for titanium to 8° for PEO-coating). Such an increase in surface hydrophilicity contributes to the greater biocompatibility of the formed coating in comparison with commercially pure titanium. PEO can be prospective as a method for improving titanium surface bioactivity.

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Section: Introductionmentioning

confidence: 99%

Bioactive Coatings Formed on Titanium by Plasma Electrolytic Oxidation: Composition and Properties

et al. 2020

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“…It is considered that this absence of effect found in biological safety tests was due to the small amount of Ti ions released. This is because the Nb 2 O 5 -, ZrO 2 -, and Ta 2 O 5 -containing TiO 2 oxide film that formed on the Ti alloy surface inhibited the release of metal ions [ 38 , 39 ].…”

Section: Resultsmentioning

confidence: 99%

Biological Safety Evaluation and Surface Modification of Biocompatible Ti–15Zr–4Nb Alloy

Okazaki

Katsuda

2021

Materials

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We performed biological safety evaluation tests of three Ti–Zr alloys under accelerated extraction condition. We also conducted histopathological analysis of long-term implantation of pure V, Al, Ni, Zr, Nb, and Ta metals as well as Ni–Ti and high-V-containing Ti–15V–3Al–3Sn alloys in rats. The effect of the dental implant (screw) shape on morphometrical parameters was investigated using rabbits. Moreover, we examined the maximum pullout properties of grit-blasted Ti–Zr alloys after their implantation in rabbits. The biological safety evaluation tests of three Ti–Zr alloys (Ti–15Zr–4Nb, Ti–15Zr–4Nb–1Ta, and Ti–15Zr–4Nb–4Ta) showed no adverse (negative) effects of either normal or accelerated extraction. No bone was formed around the pure V and Ni implants. The Al, Zr, Nb, and Ni–Ti implants were surrounded by new bone. The new bone formed around Ti–Ni and high-V-containing Ti alloys tended to be thinner than that formed around Ti–Zr and Ti–6Al–4V alloys. The rate of bone formation on the threaded portion in the Ti–15Zr–4Nb–4Ta dental implant was the same as that on a smooth surface. The maximum pullout loads of the grit- and shot-blasted Ti–Zr alloys increased linearly with implantation period in rabbits. The pullout load of grit-blasted Ti–Zr alloy rods was higher than that of shot-blasted ones. The surface roughness (Ra) and area ratio of residual Al2O3 particles of the Ti–15Zr–4Nb alloy surface grit-blasted with Al2O3 particles were the same as those of the grit-blasted Alloclassic stem surface. It was clarified that the grit-blasted Ti–15Zr–4Nb alloy could be used for artificial hip joint stems.

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“…Since the 1990s, the challenge of surface modification has been proposed. Several methods were studied since the first-generation implant surface created by machining, including plasma spray coating, grit blasting, acid etching, sandblasted and acid etching (SLA), anodizing and biomimetic coating [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Microbial Adhesion and Biofilm Formation on Bioactive Surfaces of Ti-35Nb-7Zr-5Ta Alloy Created by Anodization

et al. 2021

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This study evaluated the microbial colonization (adhesion and biofilm) on modified surfaces of a titanium alloy, Ti-35Nb-7Zr-5Ta, anodized with Ca and P or F ions, with and without silver deposition. The chemical composition, surface topography, roughness (Ra), and surface free energy were evaluated before and after the surface modifications (anodizing). Adhesion and biofilm formation on saliva-coated discs by primary colonizing species (Streptococcus sanguinis, Streptococcus gordonii, Actinomyces naeslundii) and a periodontal pathogen (Porphyromonasgingivalis) were assessed. The surfaces of titanium alloys were modified after anodizing with volcano-shaped micropores with Ca and P or nanosized with F, both with further silver deposition. There was an increase in the Ra values after micropores formation; CaP surfaces became more hydrophilic than other surfaces, showing the highest polar component. For adhesion, no difference was detected for S. gordonii on all surfaces, and some differences were observed for the other three species. No differences were found for biofilm formation per species on all surfaces. However, S. gordonii biofilm counts on distinct surfaces were lower than S. sanguinis, A. naeslundii, and P. gingivalis on some surfaces. Therefore, anodized Ti-35Nb-7Zr-5Ta affected microbial adhesion and subsequent biofilm, but silver deposition did not hinder the colonization of these microorganisms.

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Functionalization of an experimental Ti-Nb-Zr-Ta alloy with a biomimetic coating produced by plasma electrolytic oxidation

Cited by 72 publications

References 43 publications

Bioactive Coatings Formed on Titanium by Plasma Electrolytic Oxidation: Composition and Properties

Bioactive Coatings Formed on Titanium by Plasma Electrolytic Oxidation: Composition and Properties

Biological Safety Evaluation and Surface Modification of Biocompatible Ti–15Zr–4Nb Alloy

Microbial Adhesion and Biofilm Formation on Bioactive Surfaces of Ti-35Nb-7Zr-5Ta Alloy Created by Anodization

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