The aim of this study was to investigate the bone response to calcium phosphate (Ca-P) plasm a-spray and radiofrequency m agnetron sputter-coated im plants with comparable rough ness. Therefore, tapered conical screw designed im plants were installed in the trabecular bone of the femurs of nine goats. They were provided w ith two types of coatings, a plasm a-spray dual coating of fluorapatite and hydroxyapatite (FA/HA-PS) and a titanium plasm a-spray coating, cov ered w ith an am orphous CaP m agnetron sputtercoating (TPS/Ca-P-a). These implants were evaluated histologically and mechanically after 3 months of implantation. A wellcontrolled m ethod to apply and measure a torsional force to load die screw-type implants to the point of failure was introduced. All im plants healed uneventful and w ere well fixed. N o significant difference (Student t Lest, p > 0.05) for the torsional failure force w as m easured for both type of coatings. N evertheless, SEM revealed differently situated fracture planes. Light m icroscopy show ed intimate boneim plant contact for both types of coatings; original drill m ar gins w ere still visible. A lam ellar type of bone w ith some rem odeling lacunae w as show n. H istoniorphom etry re vealed a higher percentage of bone contact for the F A /H A-PS-coated im plants (student t test, p <0.05). M easurem ent of the am ount of bone revealed more bone mass around T PS/ C a-P-a-coated im plants (analysis of variance and Tukey m ultiple com parison, p < 0.05).
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