Effect of Surface Topography and Chemical Composition on Wettability of Calcium Phosphate Coatings Formed on Ti-40Nb Alloy

Комарова, Е. Г.; Chebodaeva, Valentina V.; Sharkeev, Yuriy P.; Sedelnikova, M. B.

doi:10.4028/www.scientific.net/kem.683.370

Cited by 12 publications

(6 citation statements)

References 11 publications

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“…By controlling both the composition of the sputter target material, typically medical grade hydroxyapatite (HA), and the sputter deposition parameters, the chemical and microstructural properties of the resulting CaP layer can be varied in terms of thickness and subsequently the rate of dissolution [35,36]. In addition, it has been determined that the topographical microstructure of the CaP coating surface plays a role in its subsequent dissolution rate and thereby on the onset of the attendant magnesium alloy corrosion [37,38].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Control of magnesium alloy corrosion by bioactive calcium phosphate coating: Implications for resorbable orthopaedic implants

et al. 2019

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Control of the corrosion that occurs in magnesium alloys in vivo is a significant challenge for their use as resorbable orthopaedic implants. In this work, we report on the provision of bioactive calcium phosphate (CaP) coatings on magnesium alloys that can delay substrate corrosion while offering an attendant physiochemical environment with properties known to promote an osteoinductive response in vivo. RF magnetron sputtering from hydroxyapatite (HA) powder targets has been employed to create CaP coatings on AZ31 magnesium alloy substrates. Coatings of 70 and 210 nm thickness were achieved via regulation of sputtering parameters, in particular deposition time. XPS and ToF-SIMS were used to investigate the chemistry of the coating alloy interface and also to confirm composition and thickness. The Ca/P atomic ratio of the coatings was determined by EDX to be 1.54. μCT analysis showed a substrate volume loss after 14 days exposure to SBF of 5.89 ± 3.15 mm 3 for the un-coated alloy while the presence of the ~70 nm CaP coating reduced this to 3.42 ± 0.48 mm 3 and the ~210 nm coating to 0.30 ± 0.28 mm 3. The corrosion rates were calculated to be 1.74 ± 0.06 mmpy for the AZ31 control; 1.57 ± 0.09 mmpy for the ~70 nm CaP coated alloy and 1.01 ± 0.07 mmpy for the ~210 nm thick CaP coating. These data confirm that CaP coating

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Section: Accepted Manuscriptmentioning

confidence: 99%

Control of magnesium alloy corrosion by bioactive calcium phosphate coating: Implications for resorbable orthopaedic implants

et al. 2019

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“…A significant amount of titanium and oxygen in the coating is due to the formation of an intermediate layer of titanium dioxide between the calcium phosphate coating and the metal substrate [15]. The MAO coating is calcium deficient, which is typical for coatings obtained by the micro-arc oxidation method [16,17]. A high content of carbon in calcium phosphate coatings formed by micro-arc oxidation was also observed by the authors in [18,19].…”

Section: Resultsmentioning

confidence: 65%

“…The significant amount of titanium and oxygen in the coating is attributed to the formation of an intermediate layer of titanium dioxide between the calcium phosphate coating and the metal substrate [21]. The MAO coating is calcium deficient, which is typical for coatings formed by MAO [22,23]. High carbon contents were previously observed in calcium phosphate coatings formed by MAO [24,25].…”

Section: Investigation Of Physicochemical Propertiesmentioning

confidence: 83%

Flexible intramedullary nails for limb lengthening: a comprehensive comparative study of three nails types

et al. 2019

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A comparative study of flexible intramedullary nails (FIN) used for lengthening of long tubular bones in children is presented. It has been found that the presence of calcium phosphate coating obtained by micro-arc oxidation or a composite coating based on a copolymer of vinylidene fluoride with tetrafluoroethylene and hydroxyapatite on the surface of FIN significantly enhances the formation of bone regenerate in the area of osteotomy during limb lengthening by combined osteosynthesis. The investigation of physico-chemical properties of FIN with calcium phosphate coating obtained by micro-arc oxidation demonstrated that improved bone tissue formation is due to favourable conditions for adhesion, proliferation, and differentiation of MMSCs into osteoblasts on the coating surface. Composite coatings stimulated the formation of bone tissue only in vivo, mainly due to the piezoelectric properties of the copolymer of vinylidene fluoride with tetrafluoroethylene. Keywords: flexible intramedullary nails, calcium phosphate coating, vinylidene fluoride -tetrafluoroethylene, piezoelectric, combined limb lengthening 1. Introduction Deterioration of the environmental situation, primarily in industrialized countries, and rising frequency of genetic diseases provoke an increase in the number of patients and the severity of orthopaedic pathologies associated with congenital shortening and deformities of the limbs. The limb shortening, progressing as a person develops, leads to pathological changes in the entire biomechanical system. For example, overloading a healthy limb and skewing of the pelvis cause the development of pathologies associated with deformations and dislocation of the healthy hip, leading to a decrease in the quality of life. Thus, the restoration of the limb length allows solving not only the problems of orthopaedic and biomechanical recovery, but also the problem of social rehabilitation and patient's integration into society. For congenital limb length discrepancy the correction of pathology in the affected segment and functionally related elements of the biomechanical system could be done only through surgical interventions. A major contribution for solving this problem was made by outstanding orthopaedic surgeon G.A. Ilizarov, who developed the methods of surgical treatment based on distraction osteogenesis [1,2]. The recent development of G.A Ilizarov method resulted in development of combined osteosynthesis. In this approach, the external fixation devices and thin (up to 2.5 mm) flexible intramedullary nails (FIN) implanted into medullary canal of the tubular bone are used [3,4]. The circular external fixator allows to achieve the high stability of the bone fragments positioning. FIN located in the anatomical zone with multipotent cells depot and a good blood supply, allows to control the histogenesis aimed at bone tissue production. The unique anatomical location of FIN makes it one of the key elements of the combined osteosynthesis. FIN properties largely determine the clinical success of the limb leng...

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“…To measure the static contact angles of liquids on the solid surface the sessile drop method and Young equation were used. The free surface energy of the coatings was calculated in accordance with Owens-Wendt equation [11]. For the zeta potential analysis of coatings the SurPASS™ 3 Electrokinetic Analyzer by Anton Paar (Austria) was used.…”

Section: Methodsmentioning

confidence: 99%

Formation of a Surface Charged Microarc Coatings Modified by Boehmite Nanoparticles

Chebodaeva

Sedelnikova

Golohvast

et al. 2018

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Investigations of microarc calcium phosphate (CaP) boehmite-containing biocoatings on the pure titanium (Ti) alloy were presented. There were discovered relationships of coating properties (morphology, elemental and phase composition, zeta-potential, wettability) on the boehmite deposition parameters. A variation of the modification parameters of boehmite nanoparticles deposition allowed producing hydrophilic boehmite-containing CaP coatings with the roughness of 2.2-3.1 μm and nanoscale morphology. The influence of boehmite nanoparticles on the surface zeta-potential of the coating was found.

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Effect of Surface Topography and Chemical Composition on Wettability of Calcium Phosphate Coatings Formed on Ti-40Nb Alloy

Cited by 12 publications

References 11 publications

Control of magnesium alloy corrosion by bioactive calcium phosphate coating: Implications for resorbable orthopaedic implants

Control of magnesium alloy corrosion by bioactive calcium phosphate coating: Implications for resorbable orthopaedic implants

Flexible intramedullary nails for limb lengthening: a comprehensive comparative study of three nails types

Formation of a Surface Charged Microarc Coatings Modified by Boehmite Nanoparticles

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