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Electrical polarization of plasma-spray–hydroxyapatite coatings for improvement of osteoconduction of implants

✍ Scribed by Reiko Kato; Satoshi Nakamura; Keiich Katayama; Kimihiro Yamashita

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
441 KB
Volume
74A
Category
Article
ISSN
1549-3296

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✦ Synopsis

Abstract

We have established the electrical polarization method of hydroxyapatite (HA) coatings (HAC) for clinical use, such as dental and orthopedic implants. The HAC examined in the current study was prepared in titanium substrates by plasma spraying of β‐tricalcium phosphate (TCP) powders followed by hydrothermal treatment. The prepared HAC consisted of a single phase of HA, because the starting TCP phase was completely transformed to the HA phase during the posthydrothermal treatment. Polarization was carried out at the elevated temperature of 400°C under a d.c. field of 1 kV · cm^−1^. The electrical measurements showed that the stored charges of the polarized HAC were greater than the reported value of the sintered ceramic HA. The enhanced bioactivity of the polarized HAC was demonstrated using 1.5 simulated body fluid (SBF). The crystal growth from the SBF solution was accelerated on the negatively charged surface in comparison with the untreated HAC. Similar to the polarized ceramic HA, the current results confirmed that the bioactivity of HAC would be effective for improving the initial fixation by polarization. © 2005 Wiley Periodicals, Inc. J Biomed Mater Res, 2005

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