Abstract

This study investigates the effects of lattice density, lattice structure, and lattice angle on the compressive strength of SLA-printed lattice structures designed for biomedical applications. Specimens were fabricated with 20%, 30%, and 40% lattice densities, at 30°, 60°, and 90° lattice angles, and with three different lattice geometries (Gyroid, Cross, and X-Cell). The mechanical properties of the specimens were evaluated through compressive testing in accordance with ASTM D695 standards.The results indicate that lattice density is the most significant factor influencing compressive strength (p = 0.006, F = 177.62), whereas lattice angle has no statistically significant effect (p = 0.637, F = 0.57). The highest compressive strength (33.69 MPa) was achieved with the specimen having 40% lattice density, 90° lattice angle, and Cross lattice structure.The specific strength analysis revealed that the most optimal specimen for lightweight yet strong biomedical lattice structures was the one with 40% lattice density, 90° lattice angle, and Cross lattice structure (11.86 MPa/g). These findings provide valuable insights for the design of optimized lattice structures in biomedical implants and lightweight engineering applications.

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