An in vitro study of Ti and Ti-alloys coated with sol–gel derived hydroxyapatite coatings

Metikoš‐Huković, Mirjana; Tkalčeć, Emilija; Kwokal, Ana; Piljac, Jasenka

doi:10.1016/s0257-8972(02)00732-6

Cited by 169 publications

(89 citation statements)

References 47 publications

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“…Study of hydroxyapatite (HA) coatings on metal implants has been a subject of great interest in the area of biomaterials research for a long time and has drawn increasing attention, especially in the past decade [1][2][3][4] . Bioactive HA is deposited on surfaces of metallic implants to promote bone formation and enhance implant-bone adhesion.…”

Section: Introductionmentioning

confidence: 99%

Hydroxyapatite coating by electrophoretic deposition at dynamic voltage

2008

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The aim of this study was to evaluate hydroxyapatite (HA) coatings produced by dynamic voltage during electrophoretic deposition (EPD). Dynamic voltages from 0 to 200 V were incrementally applied in three interims. The as-deposited coating was sintered at 800°C and its properties evaluated. Structure and phase analyses of both as-deposited and sintered coatings were evaluated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The HA coatings obtained by dynamic voltage consisted of two layers. While the inner layer was dense and firmly attached to the substrate and contained fine HA particles, the outer layer was porous and contained bigger particles. Repeated deposition was applied to increase the thickness of the coatings. SEM analysis showed that these coatings were free of cracks. In addition, decomposition of HA coatings was not observed until 800°C.

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Section: Introductionmentioning

confidence: 99%

Hydroxyapatite coating by electrophoretic deposition at dynamic voltage

2008

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“…Its bioactivity and osteoconductivity can be improved by coating it with calcium phosphate ceramics, especially hydroxyapatite (HAP), which are able to form a real bond with the surrounding bone tissue in vivo. [1][2][3][4] Therefore, various surface treatment techniques have been developed and used to prepare HAP coatings on the implant surfaces of Ti and its alloys; these include, for example, plasma spray, [5,6] sol-gel, [7][8][9] pulsed laser-deposition, [10][11][12] electrophoretic [13][14][15] and electrochemical deposition [16][17][18][19][20][21] methods. This last method has a variety of advantages, such as the low temperature of the process, and control over the thickness and chemical composition of the coatings.…”

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confidence: 99%

Elaboration of Monophasic and Biphasic Calcium Phosphate Coatings on Ti6Al4V Substrate by Pulsed Electrodeposition Current

et al. 2010

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Calcium phosphate coatings on Ti6Al4V substrates are elaborated by pulsed electrodeposition. The surface morphology and chemical composition of the coatings are characterized by SEM–EDS. The obtained results are systematically confirmed at the nanometre scale using TEM. Moreover, XRD is performed in order to identify the coatings phases. The results show that pulsed electrodeposition allows uniform coatings to be obtained without the holes and craters usually observed with classical electrodeposition. After appropriate heat treatment, these coatings have a biphasic composition of stoichiometric hydroxyapatite and β‐tricalcium phosphate. Moreover, the addition of 9% H2O2 to the electrolyte leads to monophasic coatings made of stoichiometric hydroxyapatite. As an indication of the passive nature of the electrodeposited coating, electrochemical potentiodynamic tests are performed in physiological solution in order to determine the corrosion behaviour of these coatings.

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“…It is known that the lesser the porosity is, the more corrosion resistance will be and all the coatings are crack-free after 24 h dipping in Ringer's solution for electrochemical corrosion testing [ 183 ]. Metikos-Hukovic et al [ 184 ] showed that well-crystallized hydroxyapatite coatings obtained from sol-gel demonstrate a signifi cant corrosion protection effect on the titanium substrate during long-term exposure to HBSS. In another study, LavosValereto et al [ 185 ] revealed the electrochemical behavior of Ti6Al7Nb alloy with and without plasma-sprayed hydroxyapatite coating in Hanks' solution and showed that the corrosion rate of coated samples is more than two times larger than that of uncoated ones.…”

Section: Corrosion Of Coated Metallic Biomaterialsmentioning

confidence: 99%

Corrosion of Metallic Biomaterials

Dikici

Esen

Duygulu

et al. 2015

Springer Series in Biomaterials Science and Engineering

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Metallic materials have been used as biomedical implants for various parts of the human body for many decades. The physiological environment (body fl uid) is considered to be extremely corrosive to metallic surfaces; and corrosion is one of the major problems to the widespread use of the metals in the human body since the corrosion products can cause infections, local pain, swelling, and loosening of the implants. Recently, the most common corrosion-resistant metallic biomaterials are made of stainless steels and titanium and its alloys along with cobaltchromium-molybdenum alloys. It is well known that protective surface fi lms of the alloys play a key role in corrosion of the metallic implants. Key documents on the corrosion behavior of the metallic biomaterials in human body have been compiled under this chapter as a review. Keywords Metallic biomaterials • Corrosion • Physical body fl uid • Bioactive materials • Implant IntroductionThe main question is, "what is the most important property for a metallic biomaterial?" Clearly, the answer is biocompatibility . In addition, it is well known that corrosion is one of the major problems affecting the biocompatibility of orthopedic devices made of metals and alloys used as implants in the human body. Compared to other implants, metallic implants have excellent mechanical properties such as high elasticity, tensile strength, wear resistance, and machining.

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An in vitro study of Ti and Ti-alloys coated with sol–gel derived hydroxyapatite coatings

Cited by 169 publications

References 47 publications

Hydroxyapatite coating by electrophoretic deposition at dynamic voltage

Hydroxyapatite coating by electrophoretic deposition at dynamic voltage

Elaboration of Monophasic and Biphasic Calcium Phosphate Coatings on Ti6Al4V Substrate by Pulsed Electrodeposition Current

Corrosion of Metallic Biomaterials

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