Comparison of bone–implant interface shear strength of solid hydroxyapatite and hydroxyapatite‐coated titanium implants

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Abstract
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. © 1993 John Wiley & Sons, Inc.

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