Abstract
Hydroxyapatite coatings have been used for many
years in hip prosthesis stems. However, it has been observed
that the coatings detaches leading to the loosening of the
prosthesis due to their mechanical properties did not meet
the requirements. Since calcium titanate has been proposed
as a coating for biomedical applications due to its good in
vitro biocompatibility and osteoconductivity, adherence
and elastic modulus of calcium phosphate-calcium titanate
composite coatings were assessed by means of scratch test
(ASTM C1624-05) and nanoindentation test (ASTM E2546-
07). In vitro biomedical properties such as genotoxicity
and hemolysis were evaluated also (ASTM F748-06).
100% calcium phosphate (CP) coating was composed of a
mixture of tricalcium and tetracalcium phosphate. Calcium
titanate (CT) was added to the coatings, by modifying
a Ca10(PO4)6(OH)2- 2xOx□x target, in 25, 50 and 75 volume
percentages. For comparison purposes, 100% TC coatings
were also obtained. It was found that adherence increases
as added 25% of one material of another rising a maximum
value in 50-50 composite coating. Besides, the coatings
were not genotoxic and not hemolytic.
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