Electrodeposition of hydroxyapatite onto nanotubular TiO2 for implant applications

Kar, Archana; Raja, Krishnan S.; Misra, M.

doi:10.1016/j.surfcoat.2006.09.008

Cited by 233 publications

(109 citation statements)

References 16 publications

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“…In order to improve its bone-bonding property, hydroxyapatite (HA) coatings have been applied on to Ti implants. 5) Several coating methods, such as plasma spraying, 6) biomimetic precipitation 7) and electrodeposition, 8) have been successfully used to deposit a HA layer on Ti or titanium alloy implants. Each of these methods has some advantages and drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Coating of hydroxyapatite films on titanium substrates by electrodeposition under pulse current

Hayakawa

Kawashita

Takaoaka

2008

J. Ceram. Soc. Japan

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Titanium (Ti) metal substrates were etched in sulfuric acid (H 2 SO 4 ) with concentrations of 25, 50, 75 and 97 at 60°C for 30 min. Hydroxyapatite (HA) films were deposited onto unetched and etched substrates by an electrodeposition method under a pulse current. The electrolyte was metastable calcium phosphate solution that had 1.5 times the ion concentrations of human body fluid, but did not contain magnesium ion at 36.5°C. Deposition times were 90 min. We used the average current density of 0.01 A/cm 2 and ON time equal to OFF time of 15 s. In the electrodeposition, hydrogen was incorporated into the surface of the Ti substrates to form titanium hydride (TiH 2 ) on the substrate surfaces. After the electrodeposition, all specimens were heated at 600°C for 60 min. The adhesion between apatite and substrates were greatly improved by the heat treatment for the substrates etched in 50 and 75 H 2 SO 4 . It is considered that in these specimens the anchoring effect due to the microstructural roughness formed by etching was enhanced by the shrinking of HA crystals during the heat treatment.

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Section: Introductionmentioning

confidence: 99%

Coating of hydroxyapatite films on titanium substrates by electrodeposition under pulse current

Hayakawa

Kawashita

Takaoaka

2008

J. Ceram. Soc. Japan

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“…An anodization process has been introduced as pre-treatment for electrochemical deposition [77]. The purpose of anodization is to support developing mechanical interlocks lanked by the metal substrate and HAp coating [78,79].…”

Section: Electrochemical Depositionmentioning

confidence: 99%

Hydroxyapatite-Based Coating on Biomedical Implant

Harun¹,

Asri²,

Sulong³

et al. 2018

Hydroxyapatite - Advances in Composite Nanomaterials, Biomedical Applications and Its Technological Facets

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The use of metallic biomaterials for replacement of biomedical implants has been traced back from the nineteenth century. These metallic biomaterials have been declared as clinical success as their mechanical properties that satisfy the prerequisite of the human bone. Nevertheless, critical issues of the materials when they are utilised as implants; including the releasing toxic and harmful metal ions through wear and corrosion processes after longer implantation. Besides that, the bonding strength between bone and implants itself is considered weak due to the diferent components of human bone and metal implants. Hence, developing hydroxyapatite (HAp) coating on metallic biomaterials is expected to overcome the problems faced by biocompatible metallic biomaterials. As far as this, various commercial techniques have been introduced to develop the HAp coating on metallic biomaterials. The techniques are including plasma-spraying method, sol-gel dip-coating, electrochemical deposition and high-velocity suspension plasma-spraying. The formation of HAp coating on metallic biomaterials improved the corrosion resistance together promoting its load-bearing ability and enhanced substrate-coating adhesion.

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“…Also, the nanotube structure serves as an excellent anchorage for HA coating which improves the mechanical interlocking of the implant to the bone. There are some reports on the preparation of HA coating on the TiO 2 nanotubes using methods, like cathodic deposition [22], electrodeposition [23], or biomimetic deposition [24]. Calcium phosphate deposition onto nanotubular TiO 2 layer by electrodeposition process is conducted in electrolytes containing salts (Table 1).…”

Section: Ha Deposition Into Titanium Oxide Nanotubesmentioning

confidence: 99%

“…Calcium phosphate deposition onto nanotubular TiO 2 layer by electrodeposition process is conducted in electrolytes containing salts (Table 1). In order to achieve more uniform HA coating with higher bond strength above 16 MPa), the alkali treatment in 0.5 M NaOH before deposition of HA can be used [23]. As a result of alkali treatment, the titanates appear at the neck of titania nanotubes enhancing the formation of HA during electrodeposition process.…”

Section: Ha Deposition Into Titanium Oxide Nanotubesmentioning

confidence: 99%

Nanotubular Titanium Oxide Layers for Enhancement of Bone-Implant Bonding and Bioactivity

Sobieszczyk¹,

Klotzke²

2011

Advances in Materials Sciences

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Titanium and titanium alloys are frequently used in orthopaedic implants in load bearing situations because they possess favourable properties, such as a good ductility, tensile and fatigue strength, modulus of elasticity matching that of bones, low weight, and good biocompatibility. The drawback of Ti implants is their poor osseointegration and osteoconductive properties. The present paper describes the techniques to improve the bioactivity of titanium and enhance the bone-implant bonding ability by the electrochemical anodization to fabricate titania nanotube arrays (TiO 2 ). The naturally formed oxide layer has bio-inert character and does not readily form a strong interface with surrounding tissue. It has been proved that osseointegration of titanium implants can be improved by rough surfaces of Ti implants [1,2]. The nanotubular surface enhances adhesion, growth and differentiation of the cells. The nanotubular arrays increase the roughness of titanium implants on the nanoscale, providing the surface similar to that of a human bone. Bone-forming cells tend to adhere to the surfaces that are similar to natural bone both in chemistry and roughness. Nanotubular layers provide a high surface-to-volume ratio with controllable dimensions which are able to differentiation of mesenchymal stem cells into osteoblastic cells. Moreover, the anodized nanotubular arrays on titanium surface can be used as reservoirs for drugs (antiinflammatory, and improving bone-growth) with prolonged drug release ability. Also, there is possibility to further enhance bioactivity of titanium implant with nanotubular surface by hydroxyapatite deposition into the titania nanotubes which further promotes bone ingrowth. The application of nanotubular structures of oxide layers can be optimized taking into consideration some important parameters as osseointegration rate and interface strength determined by nanotube mean size and length. The paper critically reviews so far investigations focused on nanooxidation of titanium and titanium alloys. The numerical model of nanotubular arrays with the use of Finite Element Method (FEM) is proposed for an assessment of the load transfer and stress distribution under applied loading which could be a critical factor when considering the described application of nanotubes.

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Electrodeposition of hydroxyapatite onto nanotubular TiO2 for implant applications

Cited by 233 publications

References 16 publications

Coating of hydroxyapatite films on titanium substrates by electrodeposition under pulse current

Coating of hydroxyapatite films on titanium substrates by electrodeposition under pulse current

Hydroxyapatite-Based Coating on Biomedical Implant

Nanotubular Titanium Oxide Layers for Enhancement of Bone-Implant Bonding and Bioactivity

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