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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2007

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Stiffness and strength of composite acrylic bone cements

Knets I., Krilova V., Cimdins R., Berzina L., Vitins V.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 20, nr 1-2

135-138

Purpose: Different acrylic bone cements based upon PMMA-MMA system are applicable for implant fixation in bone tissue. The aim of present study is the optimisation of the structure of some new bone acrylic cements made on the basis of PMMA-ethylmethacrylate-triethyleneglycoldimethacrylate and bone cements having additives (HA and radio pacifier), and the finding of the effect of these modifications on the flexural strength and stiffness. Design/methodology/approach: Different new bone cements on the basis of PMMA-EMA-TEGDMA system (ABC) were developed experimentally. The stiffness and strength of the samples of these modified cements were determined in the special three point bending equipment. Findings: A comparison of the flexural properties of new PMMA-EMA-TEGDMA cements and commercial available PMMA-MMA cement showed that commercial bone cement had larger values of ultimate strength of modulus of elasticity, but the difference is not very important. As concerns the polymerisation peak temperature, then there is a significant difference between commercial PMMA-MMA cement (-800C) and PMMA-EMA-TEGDMA modified cements (50-600C). The introduction of 10% and 18% of HA into solid phase does not influence essentially strength and modulus of elasticity of the PMMA-EMA-TEGDMA bone cements. The introduction of radio pacifier BaSO4 into bone cement leads to flexural strength diminishing. Low polimerisation peak temperature and appropriate mechanical properties of bone cements developed allows regarding new 3-D structure acrylic bone cements as promising biomaterials. Research limitations/implications: It is supposed to carry out animal testing to learn more about reaction of modified implanted material on the biological environment. Practical implications: The new materials could be efficiently used as bone cements because they will not damage surrounding biological tissue during curing. Originality/value: Paper is providing the new information about possibilities to realize the safe fixation of implants.