S. Ashroff et al., CYCLE FATIGUE OF HYDROXYAPATITE-COATED TITANIUM-ALLOY IMPLANT MATERIAL - EFFECT OF CRYSTALLINITY, Journal of long-term effects of medical implants, 6(3-4), 1996, pp. 143-155
Citations number
27
Categorie Soggetti
Medicine, Research & Experimental",Pathology,"Engineering, Biomedical",Orthopedics
Titanium alloy (ASTM F-136) rods were coated with hydroxyapatite (HA)
of 3 levels of crystallinity, which were determined by X-ray diffracti
on (XRD) analysis to be 60.5%, 52.8%, and 47.8%. Fourier Transform Inf
rared (FTIR) spectroscopy analysis showed the removal of the hydroxyl
and carbonate groups as compared to the original HA powder. It appears
that these changes are caused by the high temperature plasma spray co
ating process. Cyclic fatigue testing in a lactated Ringer's solution
to 5 million cycles showed no statistical difference in calcium dissol
ution among the 3 crystalline levels, whereas phosphorus dissolution w
as lowest from the highest crystalline coating sample. The mechanical
properties, however, did not change in response to fatigue loading.