Electrochemical and electrophoretic deposition of hydroxyapatite for orthopaedic applications

Eliaz, Noam; Sridhar, T. M.; Mudali, U. Kamachi; Raj, Baldev

doi:10.1179/174329405x50091

Cited by 140 publications

(77 citation statements)

References 11 publications

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“…It has been reported that highly crystalline structures make less soluble coatings [8]. So the high crystallinity of the coating may decrease the biodegradation rate.…”

Section: mentioning

confidence: 99%

Preparing Ca-P coating on biodegradable magnesium alloy by hydrothermal method: In vitro degradation behavior

Wang

Yan

et al. 2012

Chin. Sci. Bull.

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Magnesium alloys are potentially attractive biodegradable materials. However, their rapid corrosion rate limits their biomedical application. To slow down the rate of biodegradation, a protective calcium-phosphate coating was formed on a magnesium alloy substrate by a hydrothermal method. Scanning electron microscope results showed that the coating consisted of two layers with different crystalline characteristics. The loose outer layer showed a prism-like crystal structure, while the compact inner layer is a dense ultra-fine regular di-pyramid-like structure with an average grain dimension of ~200 nm. The compositions of the inner layer and outer layer were calcium-deficient hydroxyapatite (Ca-def HA) and dicalcium phosphate (DCPa), respectively. The coating adhered well to the substrate with a thickness of about 15 m. Immersion in Hank's solution indicated that the coating could significantly improve the degradation properties of magnesium alloy. The pH of the solution containing the coated samples increased much more slowly than the untreated control. After 8 d immersion, the uncoated sample had corroded seriously while the coated sample was much less corroded. The Ca/P atom ratio in both the layers of the coating increased and the coating was still protecting the substrate. The two layers of the coating corroded differently because of differences in solubility. The outer layer was more severely attacked and many holes were formed on the surface, the inner layer suffered less attack. In addition, a growth of precipitate on the inner layer was observed, indicating that surface bioactivity was improved by the coating. Thus, magnesium alloys coated with a Ca-P coating prepared by a hydrothermal method are promising candidate biodegradable biomaterials, and further investigation of in vivo degradation behavior is suggested. biomaterials, magnesium alloys, Ca-P coating, hydrothermal method, degradation, hydroxyapatite Citation:Li K K, Wang B, Yan B, et al. Preparing Ca-P coating on biodegradable magnesium alloy by hydrothermal method: In vitro degradation behavior. Chin

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“…It has been reported that highly crystalline structures make less soluble coatings [8]. So the high crystallinity of the coating may decrease the biodegradation rate.…”

Section: mentioning

confidence: 99%

Preparing Ca-P coating on biodegradable magnesium alloy by hydrothermal method: In vitro degradation behavior

Wang

Yan

et al. 2012

Chin. Sci. Bull.

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“…Compared toAR-316, the OCP of HA/CNT-316 shifted towards noble direction and reached a potential of -150 mV (increased by 110 mV). Similar behavior where the OCP of 316L increases after coated with HA has been reported byEliaz et al [11]. The present resultsshow that thermodynamic stabilityof the HA/CNT-316 in 0.9% NaCl solutionat 37 P o PC.…”

Section: Methodssupporting

confidence: 91%

Fabrication of Carbon Nanotube Reinforced Hydroxyapatite Coating on Stainless Steel 316L by Laser Surface Treatment

Kwok

Towards Synthesis of Micro-/Nano-Systems

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Carbon nanotube reinforced hydroxyapatitecomposite coating (HA/CNT) was fabricated on stainless steel 316L by laser surface alloying (LSA) with a 2.5-kW CW Nd:YAG laser. Metallographical, compositional and phase analysis of the laser-fabricatedcomposite coating were studied by means of scanningelectronmicroscopy (SEM),energy dispersive spectrometry (EDS) and X-ray diffractometry (XRD). In addition, the corrosion behavior of thecomposite coating was investigated bymeans of potentiodynamic polarization technique andelectrochemical impedance spectroscopy.A strong metallurgical bond was formed betweenthe substrateand the coating which was presence of microcracks. The existence of CNT in laser fabricated layer was confirmed by XRD analysis. In addition,the data of electrochemical corrosion studies illustrated the HA/CNT composite coating possessed outstanding corrosion properties compared with the 316L substrate.

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“…Furthermore, multi-walled carbon nanotubes can be functionalized by deposition of calcium orthophosphate coatings [536]. The list of most important coating techniques is comprised in Table 5, while the main advantages and drawbacks of each coating technique, as well as the major properties of the deposed calcium orthophosphates, are discussed in details elsewhere [194,240,295,525,526,[537][538][539][540][541][542][543][544][545][546][547][548][549][550][551]. Unfortunately, none of these methods is able to provide the perfect covering because each coating always contains cracks, pores, second phases and residual stresses that reduced their durability and might lead to a partial or complete disintegration of the coating in body fluids.…”

Section: Coatingsmentioning

confidence: 99%

Medical Application of Calcium Orthophosphate Bioceramics

Dorozhkin¹

2011

BIO

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In the late 1960's, a strong interest was raised in biomedical applications of ceramic materials (named bioceramics a little bit later). Bioceramics was initially used as reasonable alternatives to metals in order to increase their biocompatibility. However, within a short period, it has grown into a diverse class of biomaterials, presently including three essential types: relatively bioinert, bioactive (or surface reactive) and bioresorbable bioceramics. This review is limited to bioceramics prepared from calcium orthophosphates only, which belong to the categories of bioactive and bioresorbable compounds. There have been a number of important advances in this field during the past 30 -40 years. The research was shifted from an initial study on the develop-ment of bioinert bioceramics towards bioactive and bioresorbable bioceramics, and these different types of calcium orthophosphate bioceramics can be tuned through the structural and compositional control. At the turn of the millennium, a new concept of calcium orthophosphate bioceramics has been developed to promote a regeneration of bones. Current biomedical applications of calcium orthophosphate bioceramics include artificial replacements for hips, knees, teeth, tendons and ligaments, as well as repair for periodontal disease, maxillofacial reconstruction, augmenttation and stabilization of the jawbone, spinal fusion and bone fillers after tumor surgery. Potential future applications of calcium orthophosphate bioceramics are demonstrated in drug delivery systems, effective carriers of growth factors, bioactive peptides and/or various types of cells for tissue engineering purposes.

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Electrochemical and electrophoretic deposition of hydroxyapatite for orthopaedic applications

Cited by 140 publications

References 11 publications

Preparing Ca-P coating on biodegradable magnesium alloy by hydrothermal method: In vitro degradation behavior

Preparing Ca-P coating on biodegradable magnesium alloy by hydrothermal method: In vitro degradation behavior

Fabrication of Carbon Nanotube Reinforced Hydroxyapatite Coating on Stainless Steel 316L by Laser Surface Treatment

Medical Application of Calcium Orthophosphate Bioceramics

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