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• W7442885 abstract "The need for synthetic alternatives to conventional bone grafts is due to the limitations of current grafting materials. Our approach has been to design polymer-based graft substitutes using microsphere technology. The gel microsphere matrix and the sintered microsphere matrix were designed using the random packing of poly(lactide-co-glycolide) microspheres to create a three-dimensional porous structure. The evaluation of these methods dealt with analysis of effects of matrix composition and processing. Matrices were evaluated structurally by scanning electron microscopy and porosimetry, and biomechanically by compression testing. The evaluation revealed the high modulus of the gel microsphere matrix and the versatility of the sintered microsphere matrix. The gel microsphere matrix incorporated hydroxyapatite particles and had a Young's modulus of 1651 MPa, but structural analysis through SEM revealed a pore system less optimal for bone in-growth. The sintered microsphere matrices were fabricated without hydroxyapatite particles by thermally fusing polymeric microspheres into a three-dimensional array, possessing interconnectivity and a modulus range of 241 (±82)–349 (±89) MPa. The sintered microsphere matrix demonstrated a connected pore system and mechanical properties in the mid-range of cancellous bone. Porosimetry data indicated that matrix pore diameter varied directly with microsphere diameter, while pore volume was independent of microsphere diameter in the range of diameters examined. The microsphere-based matrices show promise as polymeric substitutes for bone repair." @default.
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• W7442885 date "2002-01-01" @default.
• W7442885 modified "2023-10-10" @default.
• W7442885 title "Tissue engineered microsphere-based matrices for bone repair:" @default.
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• W7442885 doi "https://doi.org/10.1016/s0142-9612(01)00137-5" @default.
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