Comparison of bone-implant interface shear strength of solid hydroxyapatite and hydroxyapatite-coated titanium implants.
The interface shear strength of uncoated Ti-6Al-4V, dense sintered hydroxyapatite (HA), and HA-coated Ti-6Al-4V were compared. Interface shear strength was determined using a transcortical push-out model in dogs 4 and 12 weeks after implantation. The interface shear strength of dense sintered HA and HA-coated Ti-6Al-4V was significantly higher than that of uncoated Ti-6Al-4V (P < .001). There was no significant difference between the interface shear strength of dense sintered HA and HA-coated Ti-6Al-4V. After the push-out test for HA-coated implants, the regions fractured at the bone-coating interface and at the coating-titanium interface coexisted at 4 weeks after implantation. At 12 weeks, the fracture site was, in all cases, the HA coating-titanium interface, and, in a few samples, fractures inside the coating layer also were visible.
Hayashi
K
K
Department of Orthopaedic Surgery, Faculty of Medicine, Kyushu University, Fukuoka, Japan.
Inadome
T
T
Mashima
T
T
Sugioka
Y
Y
D000497:Alloys; D000818:Animals; D001842:Bone and Bones / Q000033:anatomy & histology / Q000502:physiology*; D004285:Dogs; D005269:Femur / Q000033:anatomy & histology; D006882:Hydroxyapatites; D008855:Microscopy, Electron, Scanning; D008954:Models, Biological; D019736:Prostheses and Implants; D013499:Surface Properties; D014025:Titanium
D000497:Alloys; D006882:Hydroxyapatites; C031462:titanium alloy (TiAl6V4); D014025:Titanium