BONE BONDING ABILITY OF BIOACTIVE BONE CEMENTS

The bone bonding ability of three types of bioactive bone cement A, B, and C consisting of glass or glass ceramic powder and bisphenol-a-gly cidyl methacrylate resin was evaluated, Type A contained MgO-CaO-SiO2- P2O5-CaF2 glass powder; Type B, MgO-CaO-SiO2-P2O5-CaF2 glass ceramic p owder; and Type C, MgO free CaO-SiO2-P2O5-CaF2 glass powder, Rectangul ar plates (2 x 10 x 15 mm) of Types A, B, C, and polymethylmethacrylat e cements were implanted into the tibial metaphyses of male rabbits an d the failure load measured by mechanical failure testing (detaching t est) 10 and 25 weeks after implantation, The failure loads of Types A, B, C, and polymethylmethacrylate cements were respectively, 29.52, 41 .48, 28.22, and 0.29 N at 10 weeks and 33.42, 41.27, 33.64, and 0.20 N at 25 weeks, Examination of the bone cement interface revealed that a ll the bioactive bone cements achieved direct bone contact with the bo ne, These results showed that all three types of bioactive bone cement have the ability to bond to bone, and the cement containing glass cer amic powder revealed higher bonding strength than did those containing glass powder.