Blade, screw and stylized reproductions of tooth root dental implants coated with alumina (AL2O3) were implanted in the mandibles of dogs for periods of four to six months. The blades and screws, made of titanium, are commercially available. The implants made in the form of stylized root reproductions were cast in titanium in two configurations, one with vertical perforations in the roots to allow the ingrowth of bone, and one without perforations in the roots to allow the ingrowth of bone, and one without perforated roots. The alumina coating of all implants was done in the laboratories of the Rizzoli Institute, Bologna, Italy. The implants were evaluated monthly by radiography. Clinically, they were evaluated for mobility and by periodontal probing. At sacrifice, the mandibles were sectioned and the implant sites were examined histologically. Of the implants tested in this animal model, the root reproductions with vertical perforations were the most promising.