生体用多孔質純チタンの引張特性に及ぼす医療用高分子充填の影響

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High Youngs modulus of metallic biomaterials in comparison with that of bone affects harmfully on bone healing and remodeling. Therefore, it is important to decrease Youngs modulus of the metallic biomaterials. In that case, porous materials are advantageous from the viewpoint of obtaining a lower Youngs modulus, because Youngs modulus decreases with increasing porosity of the porous materials. However, with an increase in porosity, the other mechanical properties start deteriorating simultaneously. This deterioration of the mechanical properties is probably derived from the stress concentration at the pores of the porous materials. In comparison with metallic biomaterials, polymers exhibit lower Youngs moduli; thus a polymer filling is a likely option to improve the mechanical properties of porous materials by preventing the stress concentration at the pores without increasing the Youngs modulus. Furthermore, certain polymers exhibit intrinsic biofunctionalities. Thus, polymer filling is expected to improve the mechanical properties and impart biofunctionalities to porous materials without an increase in its Youngs modulus. In this study, the pores of porous pure titanium (pTi) with the porosity of 22-50% were filled with a medical polymer (polymethylmethacrylate: PMMA). The effects of PMMA filling on the tensile strength and Youngs modulus of pTi were then investigated. As a result, it is found that the PMMA filling improves the tensile strength of pTi with the porosity over 40%, although not significantly affecting the Youngs modulus of pTi.
社団法人粉体粉末冶金協会の論文
2008-05-15

生体用多孔質純チタンの引張特性に及ぼす医療用高分子充填の影響

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