Pulsed electrochemical deposition of calcium phosphate coatings for biomedical applications

Lissandrello, Federico; Magagnin, Luca

doi:10.1080/00202967.2023.2207334

Cited by 4 publications

(2 citation statements)

References 67 publications

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“…Ideal HAp coatings for orthopedic implants are thin (<50 µm), have high cohesive strength to prevent delamination, have a high hardness scale rating to reduce the wear, and are rough with sufficient porosity to promote the ingrowth of bone tissues [38][39][40]. Sol-gel coating [41], pulsed laser deposition [42], pulsed electrochemical deposition [43], pulsed plasma deposition [44], atmospheric plasma spraying [45], and suspension plasma spraying [46] are some examples of deposition techniques. Atmospheric plasma spraying is the most common thermal spray process for fabricating HAp coatings due to its relatively low cost and ability to coat large areas of complex shapes [40].…”

Section: Introductionmentioning

confidence: 99%

Hydroxyapatite-Based Coatings on Silicon Wafers and Printed Zirconia

Chauvin,

Garda,

Snyder

et al. 2023

JFB

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Dental surgery needs a biocompatible implant design that can ensure both osseointegration and soft tissue integration. This study aims to investigate the behavior of a hydroxyapatite-based coating, specifically designed to be deposited onto a zirconia substrate that was intentionally made porous through additive manufacturing for the purpose of reducing the cost of material. Layers were made via sol–gel dip coating by immersing the porous substrates into solutions of hydroxyapatite that were mixed with polyethyleneimine to improve the adhesion of hydroxyapatite to the substrate. The microstructure was determined by using X-ray diffraction, which showed the adhesion of hydroxyapatite; and atomic force microscopy was used to highlight the homogeneity of the coating repartition. Thermogravimetric analysis, differential scanning calorimetry, and Fourier transform infrared spectroscopy showed successful, selective removal of the polymer and a preserved hydroxyapatite coating. Finally, scanning electron microscopy pictures of the printed zirconia ceramics, which were obtained through the digital light processing additive manufacturing method, revealed that the mixed coating leads to a thicker, more uniform layer in comparison with a pure hydroxyapatite coating. Therefore, homogeneous coatings can be added to porous zirconia by combining polyethyleneimine with hydroxyapatite. This result has implications for improving global access to dental care.

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Section: Introductionmentioning

confidence: 99%

Hydroxyapatite-Based Coatings on Silicon Wafers and Printed Zirconia

Chauvin,

Garda,

Snyder

et al. 2023

JFB

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“…Plasma spraying induces the less desirable α/β-TCP and relies upon post-deposition heating to crystalize the HA, which can result in low porosity [ 28 , 29 ]. Electrochemical HA coating deposits may sometimes suffer from defects in the coatings taking the form of certain Ca-P phases or hydrogen bubbles [ 30 , 31 ]. Sol-gel and biomimetic methods are commonly used in hydroxyapatite coating research [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

Development of Hydroxyapatite Coatings for Orthopaedic Implants from Colloidal Solutions: Part 2—Detailed Characterisation of the Coatings and Their Growth Mechanism

Murphy,

Morris,

Baez

2023

Nanomaterials

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This study is the second part of a two-part study whereby supersaturated solutions of calcium and phosphate ions generate well-defined hydroxyapatite coatings for orthopaedic implants. An ‘ideal’ process solution is selected from Part 1, and the detailed characterisation of films produced from this solution is undertaken here in Part 2. Analysis is presented on the hydroxyapatite produced, in both powder form and as a film upon titanium substrates representative of orthopaedic implants. From thermal analysis data, it is shown that there is bound and interstitial water present in the hydroxyapatite. Nuclear magnetic resonance data allow for the distinction between an amorphous and a crystalline component of the material. As hydroxyapatite coatings are generated, their growth mechanism is tracked across repeated process runs. A clear understanding of the growth mechanism is achieved though crystallinity and electron imaging data. Transmission electron imaging data support the proposed crystal growth and deposition mechanism. All of the data conclude that this process has a clear propensity to grow the hydroxyapatite phase of octacalcium phosphate. The investigation of the hydroxyapatite coating and its growth mechanism establish that a stable and reproducible process window has been identified. Precise control is achieved, leading to the successful formation of the desired hydroxyapatite films.

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