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Evaluation of Commercial Implants with Nanoindentation Defines Future Development Needs for Hydroxyapatite Coatings by Kārlis A. Gross; Saeed Saber‐Samandari; Karina S. Heemann is a Medicine article available to read on EtoBox.

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## Abstract The performance of biomedical implants relies on the ability to assess and refine the microstructure of biomaterials. Instrumented nanoindentation was applied to determine the mechanical properties of plasma sprayed hydroxyapatite‐coated implants from different commercial vendors. All biomedical devices contained both amorphous and crystalline phases. Nanoindentation of the amorphous phase revealed a hardness of 1.5 ± 0.3 GPa and an elastic modulus of 48 ± 6 GPa. The crystalline phase revealed a range in hardness of 3.0–7.7 GPa. The large range is attributed to the presence of porosity, surrounding amorphous areas, and hydroxyapatite (unmolten particle cores and recrystallized hydroxyapatite). A selection of the powder type (spray‐dried or sintered) leads to different mechanical properties within the coating. A spray‐dried powder provides a lower hardness and elastic modulus when unmolten particle cores are included in the coating. Meanwhile recrystallized areas are intermediate in hardness. The combination of a polished cross‐section and nanoindentation offers the ability to determine a range of quality control tests including hardness, elastic modulus, bond strength,

Who reads Evaluation of Commercial Implants with Nanoindentation Defines Future Development Needs for Hydroxyapatite Coatings?

Author

Kārlis A. Gross; Saeed Saber‐Samandari; Karina S. Heemann

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 1552-4973)

Published

2010

Language

EN

Field

Medicine (Health Sciences)