Abstract
Conventional poly Methyl MethAcrylate (PMMA) bone cement has a problem of stress-shielding due to big difference in strength between host bone and bone cement. Nanoparticles like MgO, Silver, BaSO4 have been added to PMMA cement to improve bone healing and reduce infection. But the issue of stress-shielding due to the inclusion of the nanoparticle to PMMA is not understood yet. The objectives of this research were to determine whether inclusion of micro/nano sizes MgO particles on PMMA bone cement has any influence on the interface fracture strength. Cobalt™ HV bone cement (CBC), a commercial orthopedic bone cement, was used in this research as PMMA bone cement. Three-point bend test were conducted to find elastic and fracture properties of CBC, CBC with 36 ??m MgO additives and CBC with 22 nm MgO additives. Fracture tests were also conducted on three groups of bone-cement specimen to find interface fracture toughness: (1) bone- CBC without MgO particles, (2) bone- CBC with µm MgO particles, and (4) bone- CBC with 22 nm MgO particles. Experimental results show that MgO particle sizes has no significant effect on the adhesion strength
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