The majority of this study was to evaluate the effect of coating thickness on the shear strength of hydroxyapatite coating (HAC) to bone. Plasma-sprayed HA-coated (50 μm and 200 μm) and grit-blasted Ti-6Al-V cylinders were transcortically implanted in femora of canines. After 4, 6, 8 and 12 weeks, the implant-bone interfacial shear strength was measured by the push-out test. The results showed that the mean shear strength of 50 μm-HAC implants was higher than that of 200 μm-HAC implants at each of time period, with significant difference (p<0.05) found at 4 and 12 weeks. Both the HAC implants revealed significant greater mean shear strength than the uncoated ones. The maximum shear strength was 14.91±4.28 MPa for 50 μm-HAC implant at 8 weeks. With bone attached to the surface of HACs under observations of scanning electron microscope (SEM). the failure mode for 50 μm-HACs was in all cases at the HAC-bone interface. However, for 200 μm-HACs, the failure modes occurred at the HAC-bone, inside the coating layer and at the HAC-Ti alloy interface were found.
|Number of pages||5|
|Journal||Biomedical Engineering - Applications, Basis and Communications|
|Publication status||Published - 1992 Jan 1|
All Science Journal Classification (ASJC) codes
- Biomedical Engineering