Abstract
Poly-L-lactide (PLA) is applied in clinical application as substitute material of metallic bone fixation screws, because of PLA is bioabsorbable materials and has high level of biocompatibility. Applications of conventional bioabsorbable bone fixations are limited to low loaded region, because of their lower mechanical characteristics. In this study, PLA screws were prepared by extruding and forging. The prepared extrusion drawing conditions are with or without lubricant and 1 to 8 extrusion ratios. As higher order structure of the screws, crystallinity was measured. As mechanical properties of the screws, torsional strength and shear strength were measured. As a result, the ciystallinity didn't change at extrusion ratios 1 to 8. An increase of the shear strength and decrease of torsion strength were confirmed in drawn screws. And, it was predicted that orientation is restricted by lubricant.
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