Abstract
Metal bone fixation devices are used in the treatment of bone fractures. However, metallic materials cause inflammation in the body. In this study, we focused on bioabsorbable composite material of poly(lactic acid) (PLA) and tricalcium phosphate (TCP). However, the mechanical properties of TCP/PLA composites are lower than those of metal materials. In order to improve the mechanical properties of TCP/PLA bone fixation screws, molecular orientation by extrusion die forging was focused under various extrusion ratios (ER) and TCP contents. The orientation of molecular chains depends on the forging conditions. The purpus of this study is investigation effect of forging condition on mechanical properties of TCP/PLA scres. Then, screws were formed by extrusion die forging at ER 1.3, 4 and 8, and shear strengthe of the screws was measured. As a result, the shear strength increased with ER, and the maximum shear strength was observed at ER 4.
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