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Tracking the thermal decomposition of plasma-sprayed hydroxylapatite
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Robert B. Heimann
Veröffentlicht/Copyright:
24. November 2015
Abstract
In modern orthopedics, plasma-sprayed hydroxylapatite coatings are applied routinely to metallic parts of hip and knee prostheses, as well as to dental root implants to render them osseoconductive, that is, able to assist the body in creating new bone by ingrowth of bone cells, blood capillaries, and soft tissue. In this work, hydroxylapatite coatings were deposited by atmospheric plasma spraying on titanium alloy substrates, and characterized by synchrotron radiation X‑ray diffraction and solid-state nuclear magnetic resonance spectroscopy. The deposition parameters were varied using a statistical design of experiments methodology. Depending on the degree of heat input and heat transfer rates, (1) dehydroxylated hydroxylapatite phases such as oxy- and oxyhydroxylapatite, (2) thermal decomposition phases (tri- and tetracalcium phosphates, CaO), and (3) amorphous calcium phosphate were formed. Implications of this research are that oxyapatite appears to be unstable at ambient conditions, and that proper selection of intrinsic plasma-spray parameters is key to the chemical stability and mechanical performance of the coating.
Keywords: Hydroxylapatite; oxyhydroxylapatite; oxyapatite; amorphous calcium phosphate; plasma spraying; osseoconductive coatings; implants
Received: 2015-5-9
Accepted: 2015-6-16
Published Online: 2015-11-24
Published in Print: 2015-11-1
© 2015 by Walter de Gruyter Berlin/Boston
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Schlagwörter für diesen Artikel
Hydroxylapatite;
oxyhydroxylapatite;
oxyapatite;
amorphous calcium phosphate;
plasma spraying;
osseoconductive coatings;
implants
Artikel in diesem Heft
- On understanding the structure and composition of crystals
- Stable and metastable silicate liquid immiscibility in ferrobasalts
- When was the Earth’s conveyor belt set in motion?
- Trace element partitioning into sulfide: How lithophile elements become chalcophile and vice versa
- Petrology on Mars
- Hf and Nd isotope systematics of early Archean komatiites from surface sampling and ICDP drilling in the Barberton Greenstone Belt, South Africa
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- Experimental constraints on bubble formation and growth during magma ascent: A review
- Ankerite grains with dolomite cores: A diffusion chronometer for low- to medium-grade regionally metamorphosed clastic sediments
- Crystal structure, high-pressure, and high-temperature behavior of carbonates in the K2Mg(CO3)2–Na2Mg(CO3)2 join
- Temperature micro-mapping in oscillatory-zoned chlorite: Application to study of a green-schist facies fault zone in the Pyrenean Axial Zone (Spain)
- Micro- and nano-characterization of Zn-clays in nonsulfide supergene ores of southern Peru
- Mineralogical characterization of individual growth structures of Mn-nodules with different Ni+Cu content from the central Pacific Ocean
- The magma plumbing system of the Emeishan large igneous province and its role in basaltic magma differentiation in a continental setting
- Weathering of the Ethiopian volcanic province: A new weathering index to characterize and compare soils
- Recommended mineral-melt partition coefficients for FRTEs (Cu), Ga, and Ge during mantle melting
- Tetrahedral plot diagram: A geometrical solution for quaternary systems
- Investigations on alunogen under Mars-relevant temperature conditions: An example for a single-crystal-to-single-crystal phase transition
- Crystallization of calcium oxalate hydrates by interaction of calcite marble with fungus Aspergillus niger
- Direct and indirect evidence for free oxygen (O2–) in MO-silicate glasses and melts (M = Mg, Ca, Pb)
- Effect of fluid composition on growth rate of monazite in quartzite at 1.0 GPa and 1000 °C
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- Mineralogical evolution of Fe–Si-rich layers at the olivine-water interface during carbonation reactions
- High-pressure spectroscopic study of siderite (FeCO3) with a focus on spin crossover
- Exploring the potential of Raman spectroscopy for crystallochemical analyses of complex hydrous silicates: I. Amphiboles
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- The mechanism of infiltration of metamorphic fluids recorded by hydration and carbonation of epidote-amphibolite facies metabasaltic sills in the SW Scottish Highlands
- The axial ratio of hcp Fe and Fe–Ni–Si alloys to the conditions of Earth’s inner core
- Shock-induced mobilization of metal and sulfide in planetesimals: Evidence from the Buck Mountains 005 (L6 S4) dike-bearing chondrite
- The accretion and differentiation of Earth under oxidizing conditions
- Dislocation microstructures in simple-shear-deformed wadsleyite at transition-zone conditions: Weak-beam dark-field TEM characterization of dislocations on the (010) plane
- Chemical composition and crystal structure of merrillite from the Suizhou meteorite
