Hydroxyapatite coating deposited on grade 4 Titanium by Plasma Electrolytic Oxidation

Antônio, César Augusto; Cruz, Nilson Cristino da; Rangel, Elidiane Cipriano; Rangel, Rita de Cássia Cipriano; Araujo, Tamires do Espirito Santo; Durrant, Steven F.; Más, Bruna Antunes; Duek, Eliana A. R.

doi:10.1590/1516-1439.286914

Cited by 7 publications

(3 citation statements)

References 36 publications

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“…Some authors demonstrate improved bone–implant binding and acceleration in the mineralization process at early implantation times [ 47 , 48 , 49 ]. However, there are in vivo [ 50 ] and in vitro [ 51 ] results suggesting a lower performance for these implants. Studies that refer to the use of PSHA implants in clinical practice report the failure of these implants in patients for reasons that include low mechanical strength at the interface between the HA coating and titanium.…”

Section: Discussionmentioning

confidence: 99%

Osteosphere Model to Evaluate Cell–Surface Interactions of Implantable Biomaterials

et al. 2021

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Successful biomaterials for bone tissue therapy must present different biocompatible properties, such as the ability to stimulate the migration and proliferation of osteogenic cells on the implantable surface, to increase attachment and avoid the risks of implant movement after surgery. The present work investigates the applicability of a three-dimensional (3D) model of bone cells (osteospheres) in the evaluation of osteoconductive properties of different implant surfaces. Three different titanium surface treatments were tested: machined (MA), sandblasting and acid etching (BE), and Hydroxyapatite coating by plasma spray (PSHA). The surfaces were characterized by Scanning Electron Microscopy (SEM) and atomic force microscopy (AFM), confirming that they present very distinct roughness. After seeding the osteospheres, cell–surface interactions were studied in relation to cell proliferation, migration, and spreading. The results show that BE surfaces present higher densities of cells, leaving the aggregates towards than titanium surfaces, providing more evidence of migration. The PSHA surface presented the lowest performance in all analyses. The results indicate that the 3D model allows the focal analysis of an in vitro cell/surfaces interaction of cells and surfaces. Moreover, by demonstrating the agreement with the clinical data observed in the literature, they suggest a potential use as a predictive preclinical tool for investigating osteoconductive properties of novel biomaterials for bone therapy.

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Section: Discussionmentioning

confidence: 99%

Osteosphere Model to Evaluate Cell–Surface Interactions of Implantable Biomaterials

et al. 2021

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“…In such a case, the micro arcs, resulting from the electric breakdown of the coating, are not intense enough to reach the substrate causing the formation of large pores 22 . As the coatings' thickness increases, the microarcs become more and more intense, and the resulting local heating can punctually melt the substrate, forming pores and increasing the rates of 23 . In this way, the coating growth mechanism involves the formation of pores through the melting of the substrate, the re-deposition of the molten metal quenched by the electrolyte, and the incorporation of species through reactions involving species on the surface and in the electrolyte.…”

Section: Morphology Composition and Thicknessmentioning

confidence: 99%

“…Although increasing the voltage from 500 V to 600 V roughly doubled the thickness of the coating, cracks can be observed on the surface of the sample grown under the highest voltage, Figure 3b. Such defects are consequences of the establishment of high thermal power micro arcs, which are deleterious to the coating integrity 23 . Therefore, higher voltages are disadvantageous for the growing of the highquality porous coatings pursued in this work.…”

Section: Morphology Composition and Thicknessmentioning

confidence: 99%

Heterogeneous Photocatalysis with Niobium Doped-Titanium Substrates Treated by Plasma Electrolytic Oxidation

Orsetti¹,

Gonçalves²,

Sottovia³

et al. 2022

Mat. Res.

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Plasma Electrolytic Oxidation (PEO) was employed for the generation of porous niobium-containing surfaces with enhanced photocatalytic activity. Pulses of 500 and 600 V, with a repetition rate of 60 Hz, were applied to titanium disks immersed in niobium-containing electrolytic solutions. The treatment time ranged from 180 to 600 s, and the surface morphology was analyzed by scanning electron microscopy, while X-ray diffraction was employed in the evaluation of crystallographic structure. The optical gap of the samples was determined from UV-Vis reflection spectra, and an automated goniometer was used for contact angle and surface energy measurements. More than 35% of Nb has been incorporated into the samples. Under certain conditions, the treatments resulted in a reduction of the optical gap from 3.18 to 2.63 eV as compared to as-received samples. Photocatalytic degradation rates of methylene blue as high as 70% have been reached after 120 minutes under irradiation with UV-Vis light.

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Morphology and Corrosion Resistance of Hydroxyapatite Coatings Formed on Commercially Pure Titanium

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Pohrelyuk

Proskurnyak

et al. 2023

J. of Materi Eng and Perform

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Hydroxyapatite coating deposited on grade 4 Titanium by Plasma Electrolytic Oxidation

Cited by 7 publications

References 36 publications

Osteosphere Model to Evaluate Cell–Surface Interactions of Implantable Biomaterials

Osteosphere Model to Evaluate Cell–Surface Interactions of Implantable Biomaterials

Heterogeneous Photocatalysis with Niobium Doped-Titanium Substrates Treated by Plasma Electrolytic Oxidation

Morphology and Corrosion Resistance of Hydroxyapatite Coatings Formed on Commercially Pure Titanium

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