In-vitro comparison of hydroxyapatite coatings obtained by cold spray and conventional thermal spray technologies

Vilardell, A.M.; Cinca, N.; Garcia-Giralt, Natàlia; Dosta, S.; Cano, I.G.; Nogués, Xavier; Guilemany, J.M.

doi:10.1016/j.msec.2019.110306

Cited by 44 publications

(42 citation statements)

References 42 publications

(58 reference statements)

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“…However, there have been problems associated with the poor clinical performances of conventional plasma-sprayed coatings [5]. Therefore, different methods such as electrophoretic deposition, thermal spray deposition, sol-gel coating, and biomimetic coating have been developed to coat Ti implants [6][7][8][9][10]. In particular, the biomimetic apatite coating method is one of the most promising coating technologies, since it can prepare the HA coatings on implant surfaces at a relatively low temperature [6,11].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Nano-Scale Hydroxyapatite Coating Synthesized from Eggshells Through Hydrothermal Reaction on Commercially Pure Titanium

Hsu

et al. 2020

Coatings

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Commercially pure titanium (c.p. Ti) is often used in biomedical implants, but its surface cannot usually combine with the living bone. A coating of hydroxyapatite (HA) on the surface of titanium implants provides excellent mechanical properties and has good biological activity and biocompatibility. For optimal osteocompatibility, the structure, size, and composition of HA crystals should be closer to those of biological apatite. Our results show that the surface of c.p. Ti was entirely covered by rod-like HA nanoparticles after alkali treatment and subsequent hydrothermal treatment at 150 °C for 48 h. Nano-sized apatite aggregates began to nucleate on HA-coated c.p. Ti surfaces after immersion in simulated body fluid (SBF) for 6 h, while no obvious precipitation was found on the uncoated sample. Higher apatite-forming ability (bioactivity) could be acquired by the samples after HA coating. The HA coating featured bone-like nanostructure, high crystallinity, and carbonate substitution. It can be expected that HA coatings synthesized from eggshells on c.p. Ti through a hydrothermal reaction could be used in dental implant applications in the future.

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Section: Introductionmentioning

confidence: 99%

Characterization of Nano-Scale Hydroxyapatite Coating Synthesized from Eggshells Through Hydrothermal Reaction on Commercially Pure Titanium

Hsu

et al. 2020

Coatings

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“…Plasma spray (PS) is another technique in which molten HA particles are sprayed on the surface of Ti or other metal substrates at high temperatures, resulting in a strong adhesive coating that does not peel off easily ( Bonfante et al, 2012 ; Bergamo et al, 2019 ; Tanzer et al, 2019 ; Vilardell et al, 2020 ). In the PSHA process, relatively rough conditions, including vacuum environment and high temperature exposure, require close monitoring, and PS technology is most suitable for complex metal substrates that can withstand rough conditions without any changes in microarchitecture ( Xuereb et al, 2015 ).…”

Section: Introductionmentioning

confidence: 99%

Plasma Spray vs. Electrochemical Deposition: Toward a Better Osteogenic Effect of Hydroxyapatite Coatings on 3D-Printed Titanium Scaffolds

Sun

Zhang

Luo

et al. 2021

Front. Bioeng. Biotechnol.

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Surface modification of three-dimensional (3D)-printed titanium (Ti) scaffolds with hydroxyapatite (HA) has been a research hotspot in biomedical engineering. However, unlike HA coatings on a plain surface, 3D-printed Ti scaffolds have inherent porous structures that influence the characteristics of HA coatings and osteointegration. In the present study, HA coatings were successfully fabricated on 3D-printed Ti scaffolds using plasma spray and electrochemical deposition, named plasma sprayed HA (PSHA) and electrochemically deposited HA (EDHA), respectively. Compared to EDHA scaffolds, HA coatings on PSHA scaffolds were smooth and continuous. In vitro cell studies confirmed that PSHA scaffolds have better potential to promote bone mesenchymal stem cell adhesion, proliferation, and osteogenic differentiation than EDHA scaffolds in the early and late stages. Moreover, in vivo studies showed that PSHA scaffolds were endowed with superior bone repair capacity. Although the EDHA technology is simpler and more controllable, its limitation due to the crystalline and HA structures needs to be improved in the future. Thus, we believe that plasma spray is a better choice for fabricating HA coatings on implanted scaffolds, which may become a promising method for treating bone defects.

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“…[15][16][17][18][19][20] Among them, thermal spraying processes like flame spraying, plasma spraying and high-velocity oxy-fuel (HVOF) spraying are the most suitable techniques to deposit HAp coating. [20][21][22][23] Researchers have investigated adhesion strength, microhardness, bacterial adhesion and bioactivity of the HAp coatings prepared by varying processing parameters and powder particle size. [20][21][22][23][24][25][26][27][28] They have observed that thermal spray HAp coatings, especially plasma spray, generates phases such as amorphous calcium phosphate (ACP), Tri-calcium phosphate (TCP) and tetra-calcium phosphates (TTCP).…”

Section: Introductionmentioning

confidence: 99%

“…[20][21][22][23] Researchers have investigated adhesion strength, microhardness, bacterial adhesion and bioactivity of the HAp coatings prepared by varying processing parameters and powder particle size. [20][21][22][23][24][25][26][27][28] They have observed that thermal spray HAp coatings, especially plasma spray, generates phases such as amorphous calcium phosphate (ACP), Tri-calcium phosphate (TCP) and tetra-calcium phosphates (TTCP). [15][16][17] These phases contribute to enhancing the coating healing action.…”

Section: Introductionmentioning

confidence: 99%

“…20 In contrary to plasma spray, researchers have obtained a comparatively lower percentage of amorphous phases through the HVOF process. 21 Authors have reported the higher strength and microhardness values of the HVOF sprayed HAp coating owing to the higher particle velocity and low flame temperature of the process than the plasma spraying. 25,26 In this work, the modified flame spray process, also called Low-velocity oxy-fuel (LVOF) spraying, was used to develop HAp coating on UNS S31254 stainless steel.…”

Section: Introductionmentioning

confidence: 99%

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Low velocity oxy fuel spraying of hydroxyapatite coating on a multifunctional UNS S31254 austenitic stainless steel

Tiwari

Mishra

2021

Proc Inst Mech Eng H

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Artificial material such as stainless steel (SS) is widely used for orthopaedic applications owing to its superior properties, ease of fabrication and lower cost. However, in the body environment, stainless steel can leach toxic elements such as nickel and chromium. To prevent this, a hydroxyapatite (HAp) coating having chemical characteristics very similar to the human bone was deposited on a medical-grade UNS S31254 austenitic stainless steel by a Low-velocity oxy-fuel spray gun (LVOF). The coating was characterised by using a field emission scanning electron microscope (FESEM), X-ray diffractometer (XRD) and Fourier transform infrared spectroscope (FTIR). The adhesion strength, microhardness and corrosion behaviour were studied using the Tensometre, Vickers microhardness tester and potentiodynamic polarisation with electrochemical impedance spectroscope. The bacterial adhesion and bioactivity of the coating were also evaluated. The LVOF sprayed HAp coating has shown better corrosion resistance, higher bioactivity and higher hardness than the uncoated steel. The presence of tricalcium phosphate, octa-calcium phosphate (OCP) and tetra-calcium phosphate (TTCP) was found in the coating. LVOF sprayed HAp coating is also found suitable in lowering the bacterial adhesion on the steel substrate.

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In-vitro comparison of hydroxyapatite coatings obtained by cold spray and conventional thermal spray technologies

Cited by 44 publications

References 42 publications

Characterization of Nano-Scale Hydroxyapatite Coating Synthesized from Eggshells Through Hydrothermal Reaction on Commercially Pure Titanium

Characterization of Nano-Scale Hydroxyapatite Coating Synthesized from Eggshells Through Hydrothermal Reaction on Commercially Pure Titanium

Plasma Spray vs. Electrochemical Deposition: Toward a Better Osteogenic Effect of Hydroxyapatite Coatings on 3D-Printed Titanium Scaffolds

Low velocity oxy fuel spraying of hydroxyapatite coating on a multifunctional UNS S31254 austenitic stainless steel

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