Bioceramic Coatings for Medical Implants

Heimann, Robert B.; Lehmann, Hans D.

doi:10.1002/9783527682294

Cited by 51 publications

(53 citation statements)

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“…A list of salient advantages includes [1] • At the implant surface facing the marrow-filled femoral cavity, a thin bone lamella has formed adjacent to the continuous and intact hydroxylapatite (HAp) coating deposited by plasma spraying on a likewise plasma-sprayed TiO2 bond coat. There is no formation of a connective tissue layer.…”

Section: Advantages Of Hydroxylapatite Coatingsmentioning

confidence: 99%

“…The reason for this is deeply rooted in the non-linear nature of the deposition process. More details on the physics and technology of the plasma-spraying process and, in particular, plasma spraying of hydroxylapatite can be found in several textbooks written by the author [1,23,24].…”

Section: Coating Deposition By Plasma Sprayingmentioning

confidence: 99%

“…Such osseostimulating cytokines include the transforming growth factor β (TGF-β), insulin-like growth factor (IGF-1), and in particular the family of rhBMPs (recombinant human bone morphogenetic proteins). Hence, owing to the presence of Characteristic surface features of a typical plasma-sprayed hydroxylapatite coating with overlapping pancake-like particle splats and some loosely adhering incompletely melted particles [1]. (B) Bright field STEM image of a cross-section of a plasma-sprayed hydroxylapatite coating on Ti6Al4V.…”

Section: Key Characteristics Of Plasma-sprayed Hydroxylapatite Coatingsmentioning

confidence: 99%

“…These techniques include low temperature methods such as biomimetic precipitation from simulated body solutions, wet chemical processing via sol-gel routes, electron and magnetron sputtering, ion beam-assisted deposition (IBAD), electrophoretic deposition (EPD), plasma electrolytic oxidation (PEO), and several other less frequently utilized techniques [1,2]. However, thermal, in particular, plasma spraying is still the method of choice applied by the medical industry to coat the stems of hip endoprostheses [3].…”

Section: Introductionmentioning

confidence: 99%

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Osseoconductive and Corrosion-Inhibiting Plasma-Sprayed Calcium Phosphate Coatings for Metallic Medical Implants

Heimann

2017

Metals

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During the last several decades, research into bioceramic coatings for medical implants has emerged as a hot topic among materials scientists and clinical practitioners alike. In particular, today, calcium phosphate-based bioceramic materials are ubiquitously used in clinical applications to coat the stems of metallic endoprosthetic hips as well as the surfaces of dental root implants. Such implants frequently consist of titanium alloys, CoCrMo alloy, or austenitic surgical stainless steels, and aim at replacing lost body parts or restoring functions to diseased or damaged tissues of the human body. In addition, besides such inherently corrosion-resistant metals, increasingly, biodegradable metals such as magnesium alloys are being researched for osseosynthetic devices and coronary stents both of which are intended to remain in the human body for only a short time. Biocompatible coatings provide not only vital biological functions by supporting osseoconductivity but may serve also to protect the metallic parts of implants from corrosion in the aggressive metabolic environment. Moreover, the essential properties of hydroxylapatite-based bioceramic coatings including their in vitro alteration in contact with simulated body fluids will be addressed in this current review paper. In addition, a paradigmatic shift is suggested towards the development of transition metal-substituted calcium hexa-orthophosphates with the NaSiCON (Na superionic conductor) structure to be used for implant coatings with superior degradation resistance in the corrosive body environment and with pronounced ionic conductivity that might be utilized in novel devices for electrical bone growth stimulation.

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Section: Advantages Of Hydroxylapatite Coatingsmentioning

confidence: 99%

Section: Coating Deposition By Plasma Sprayingmentioning

confidence: 99%

Section: Key Characteristics Of Plasma-sprayed Hydroxylapatite Coatingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Osseoconductive and Corrosion-Inhibiting Plasma-Sprayed Calcium Phosphate Coatings for Metallic Medical Implants

Heimann

2017

Metals

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“…In such cases, the material is applied as a coating on metallic substrates such as Ti, Ti alloys and CoCrMo, where the excellent mechanical properties of the metal are combined with the osseoconductive ability of the coating [4]. With the plethora of coating techniques available for deposition [5], thermal spray remains the method of choice on industrial scale [6]. It is known that the interaction of the high temperature droplets formed in the plasma, and subsequent rapid cooling on interaction with the cold substrates, leads to thermal decomposition.…”

Section: Introductionmentioning

confidence: 99%

In-vitro Investigation of Air Plasma-Sprayed Hydroxyapatite Coatings by Diffraction Techniques

Venter

Heimann

Topić

et al. 2016

Residual Stresses 2016

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Abstract. The influence exposure to simulated body fluid (SBF) has on plasma-sprayed hydroxyapatite (HAp) coatings of medical-grade Ti6Al4V rods was investigated by quantifying the depth dependence of the phase composition and residual stress through the coating thickness using diffraction techniques. Chemical phase identification showed HAp existing together with its thermal decomposition products, tetra-calcium phosphate (TTCP), tri-calcium phosphate (TCP) and calcium oxide. With depth, the HAp content decreases with a corresponding increase in TTCP. The near surface stress condition comprised ~50 ± 10 MPa hoop stress with the radial stress being close to zero. With depth the hoop stress decreases linearly to ~-50 ± 25 MPa at the substrate interface, whilst the radial stress increases with depth. Upon exposure to SBF, the coating composition reveals an increase in HAp from ~80.0 ± 0.5 to ~86.0 ± 0.5 wt%, accompanied by a decrease of TTCP from ~10 ± 2 to ~6 ± 2 wt% wt%. A change in stress state occurred within the first day of incubation; where after, with further exposure time the stress state converted back to values similar to that of the assprayed condition.

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Coatings on Surgical Tools and How to Promote Adhesion of Bio‐Friendly Coatings on Their Surfaces

Kumar

Bhushan

Bhattacharya

2017

Adhesion in Pharmaceutical, Biomedical and Dental Fields

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Bioceramic Coatings for Medical Implants

Cited by 51 publications

References 0 publications

Osseoconductive and Corrosion-Inhibiting Plasma-Sprayed Calcium Phosphate Coatings for Metallic Medical Implants

Osseoconductive and Corrosion-Inhibiting Plasma-Sprayed Calcium Phosphate Coatings for Metallic Medical Implants

In-vitro Investigation of Air Plasma-Sprayed Hydroxyapatite Coatings by Diffraction Techniques

Coatings on Surgical Tools and How to Promote Adhesion of Bio‐Friendly Coatings on Their Surfaces

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