Ultrahigh-molecular weight polyethylene and hydroxylapatite-based materials for replacement of bone tissue

Nanomechanical and tribological behavior of hydroxyapatite reinforced ultrahigh molecular weight polyethylene nanocomposites for biomedical applications

“…The reduction in plasticity index after adding the filler is because the reinforcement improved the hardness and the stiffness of the nanocomposites. It is known that the harder materials have lower plasticity index than the softer materials . The increase in nano‐HA content leads to an increase in the interfacial bonding between filler and matrix, and as a result, the stress transfer from polymer to matrix is improved, and thus plasticity index decreases.…”

“…They found that elastic modulus was enhanced by a higher percentage of natural HA, but deformation was decreased. 27 Filipenkov et al 28 determined the mechanical characteristics and biocompatibility of natural hydroxyapatites (NHA)/UHMWPE composites as bone replacement. They stated that a change in the matrix to reinforcement ratio would change the mechanical properties of NHA/UHMWPE composites.…”

“…Knets et al investigated on natural HA/UHMWPE composite for replacement of bone tissue. They found that elastic modulus was enhanced by a higher percentage of natural HA, but deformation was decreased . Filipenkov et al determined the mechanical characteristics and biocompatibility of natural hydroxyapatites (NHA)/UHMWPE composites as bone replacement.…”

Processing of hydroxyapatite reinforced ultrahigh molecular weight polyethylene for biomedical applications

“…Knets et al [24] produced an annealed compact bone tissue reinforced UHMWPE composite, but few processing details were given. Cunha et al [25] studied the influence of processing conditions on the mechanical behavior of the HA/UHMWPE composite using injection and compression molding, and found that injection moulding process assured better results than the compression molding due to the intensive mixing and shearing of the polymer.…”

Synthesis of nano-HA and the effects on the mechanical properties of HA/UHMWPE nanocomposites

“…[17,18] HA is a kind of bioactive material with excellent surface activity and good biocompatibility. [24] In this study, nanosized HA was synthesised via sol-gel method from analytical grade phosphoric pentoxide P 2 O 5 and analytical grade calcium nitrate tetrahydrate Ca(NO 3 ) 2 sources, and its characteristics were evaluated by Fourier transform infrared (FTIR), X-ray diffraction (XRD) and scanning electron microscope (SEM). [19] There are nanocrystals of HA in bone matrix with dimensions of about 4× 50× 50 nm.…”