alexa A review on calcium phosphate coatings produced using a sputtering process--an alternative to plasma spraying.

Author(s): Yang Y, Kim KH, Ong JL

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Abstract New promising techniques for depositing hydroxyapatite (HA) and calcium phosphate (CaP) coatings on medical devices are continuously being investigated. Given the vast number of experimental deposition process currently available, this review will focus only on CaP and/or HA coatings produced using the sputtering process. This review will discuss the characterization of sputtered CaP coatings before and after post-deposition treatments and tissue responses to some of the characterized coating surfaces. From the studies observed in the literature, current research on sputtered CaP coatings has shown some promises that may eliminate some of the problems associated with the plasma-spraying process. It has been generally accepted that sputtered HA and CaP coatings improve bone strength and initial osseointegration rate. However, optimal coating properties required to achieve maximal bone response are yet to be reported. As such, the use of well-characterized sputtered CaP and/or HA surfaces in the evaluation of biological responses should be well documented to avoid controversial results. In addition, future investigations of the sputtering process should include clinical trials, to continue the understanding of bone responses to coated-implant surfaces of different properties, and the possibility of coupling sputtered HA and CaP coatings with growth factors. This article was published in Biomaterials and referenced in

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