The Research and Development Institute of Industrial Glass in the town of Teplice (North Bohemia) has developed bioceramics (BAS-O) with presupposed surface activity manifested during its implantation in the macroorganism. The test was carried out by means of Macor inert ceramics produced by Corning Co. In total there were performed 8 implantations of surface active bioceramics and 7 implantations of inert ceramics in the tibiae and femurs of four dogs. After two months the experimental animals were sacrificed and the implants were examined. All eight prisms of BAS-O surface active ceramics were firmly connected with the bone and could be removed from bones only by force. On the contrary, the control inert ceramics could be removed from the bone by a pincette. The contact X-ray pictures showed an interface of surrounding tissue around inert ceramics and contrary to this, in case of surface bioceramics the bone trabeculea penetrated into the implants. The surrounding fibrous tissue around inert ceramics was proved in all cases by microscopic examination. In case of surface active bioceramics the fibrous intermedial layer was not proved even by electron microscopy.