A Review of Hydroxyapatite Coatings Manufactured by Thermal Spray

Berndt, C. C.; Hasan, Fahad; Tietz, U.; Schmitz, K.-P.

doi:10.1007/978-3-642-53980-0_9

Cited by 48 publications

(66 citation statements)

References 138 publications

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“…Domains with a high content in HA appear to be embedded in an amorphous phase acting as a binder. These observations are consistent with other descriptions of phenomenon occurring during plasma spraying [4, 5, 63, 65]. The nodules of HA, which appear as well delimited zones, are believed to correspond to the unmelt cores of the splats.…”

Section: Physical-chemical Characteristics Of the Coatingssupporting

confidence: 91%

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Comparison of Physical-chemical and Mechanical Properties of Chlorapatite and Hydroxyapatite Plasma Sprayed Coatings

Demnati¹,

Grossin²,

Marsan³

et al. 2015

TOBEJ

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Chlorapatite can be considered a potential biomaterial for orthopaedic applications. Its use as plasma-sprayed coating could be of interest considering its thermal properties and particularly its ability to melt without decomposition unlike hydroxyapatite. Chlorapatite (ClA) was synthesized by a high-temperature ion exchange reaction starting from commercial stoichiometric hydroxyapatites (HA). The ClA powder showed similar characteristics as the original industrial HA powder, and was obtained in the monoclinic form. The HA and ClA powders were plasma-sprayed using a low-energy plasma spraying system with identical processing parameters. The coatings were characterized by physical-chemical methods, i.e. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy, including distribution mapping of the main phases detected such as amorphous calcium phosphate (ACP), oxyapatite (OA), and HA or ClA. The unexpected formation of oxyapatite in ClA coatings was assigned to a side reaction with contaminating oxygenated species (O2, H2O). ClA coatings exhibited characteristics different from HA, showing a lower content of oxyapatite and amorphous phase. Although their adhesion strength was found to be lower than that of HA coatings, their application could be an interesting alternative, offering, in particular, a larger range of spraying conditions without formation of massive impurities.

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Section: Physical-chemical Characteristics Of the Coatingssupporting

confidence: 91%

“…The ultimate loads observed are in the lower range of those reported for HA coatings obtained by plasma spraying [65]. The main drawback of this basic standardized test is the diffusion of the glue in the porous coating and its limitation to rather thick coatings (above 0.38 mm).…”

Section: Tensile Strength (Astm C633-01 Iso 13779-4)mentioning

confidence: 84%

Comparison of Physical-chemical and Mechanical Properties of Chlorapatite and Hydroxyapatite Plasma Sprayed Coatings

Demnati¹,

Grossin²,

Marsan³

et al. 2015

TOBEJ

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“…In reviews [27,28], the recent investigations on the effect of the implant surface on the formation of a strong joint with bone tissue have been analyzed. The growing concern for this problem is related to the fact that the implant-bone tissue system is one of the most complex types of composite material, the interface of which is formed after the integration of the implant into the living organism.…”

Section: Discussionmentioning

confidence: 99%

“…3 2016 strong joint between them during the early step of inte gration. The interface can be formed using a porous plasma titanium coating, the elastic modulus of which is 0.05 to 0.25 of the elastic modulus of the bulk material; this decreases the concentration of stresses on the interface [27][28][29][30][31][32]. The conventional porous titanium coating has a higher specific surface area, 71 μm 2 /μm as com pared to 43.8 μm 2 /μm for titanium after abrasive treat ment, which increases the carrying ability of the inter face at equivalent strength of the joint [33].…”

Section: Discussionmentioning

confidence: 99%

“…At present, there are "sev eral methods for the improvement of coatings; how ever, the problems of increasing the adhesion and cohesion of coatings remain" [35]. The porosity of the coating on implants must not be too high, because pores are the concentrators of stresses, which lead to destruction; however, a definite porosity level, partic ularly on the coating surface, is necessary for the for mation of the cells of bone tissue [27]. There is a hardly resolved contradiction in these requirements on the composite coating for intraosseous implants, because, on one hand, the coating should be porous and, on the other hand, it must be strong and be able to carry high loads and transfer them from implant to bone tissue.…”

Section: Discussionmentioning

confidence: 99%

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Structure and shear strength of implants with plasma coatings

Калита

Mamaev

Мамаева

et al. 2016

Inorg. Mater. Appl. Res.

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Four types of three dimensional plasma capillary porous titanium coatings for model intraosseous implants are developed. By means of pulsed microplasma oxidation in solutions or plasma spray ing of powders, additional bioactive coatings on the basis of calcium phosphates are deposited on the Ti coat ing surface. Shear strength values of the interface between the implants coated and osseous block after 16 weeks of implantation are 4.25-4.81 MPa, while for implants with additional plasma hydroxyapatite coat ing it exceeds 6.19 MPa after 4 weeks of implantation.

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