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The Journal of Arthroplasty, ISSN: 0883-5403, Vol: 17, Issue: 3, Page: 304-311
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The effect of substrate roughness and hydroxyapatite coating thickness on implant shear strength
M. Svehla; P. Morberg; W. R. Walsh; W. Bruce; B. ZicatThis study examined the role of substrate preparation and hydroxyapatite (HA) coating thickness on bone ongrowth and shear strength in a bilateral bicortical sheep model. Plasma-sprayed and grit-blasted titanium implants with different thickness HA coatings were examined at 4, 8, 12, and 26 weeks after implantation. Shear strength increased with time for all implants. Plasma-sprayed implants were superior to grit-blasted implants at all time points. The 100-μm-thick HA layer used in the present study provided greater fixation and ongrowth and less resorption compared with the 50-μm-thick layer. We did not observe any advantage in using a thicker HA coating for the titanium substrates examined.
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