The influence of internally architected voids in the creation of high‑strength, low‑weight 3D‑printed cobalt–chromium prototypes

Abstract

Background: The additive manufacturing technology made the topology optimization technique
feasible. This technique can indefinitely reduce the weight of the printed items with a promising
increase in the mechanical properties of that item.
Materials and Methods: In the current experimental study, 50 samples were fabricated for
a 3‑point bending test. They were divided into (n = 5) as a control Group 1 free of internal
geometries, (n = 15) for each of Groups 2–4, and they were subdivided into (n = 5) for each
percentage of reduction per volume (10%, 15%, and 20%). Spherical, ovoid, and diamond shapes
were each group’s fundamental geometries, respectively. Cylindrical tunnels connected the voids
in each group. Radiographic images were performed to validate the created geometries, the weight
was measured, and flexural strength and modulus of elasticity were calculated. Data were analyzed
by one‑way ANOVA and Duncan’s post hoc tests at P ˂ 0.05.
Results: The weight results showed a significant reduction in mass. The flexural strength of Group 2
at a 10% reduction per volume had the highest mean significantly without compromising the elastic
modulus. In comparison, the means of group 4 at 20% reduction showed the lowest level of toughness.
Conclusion: The weight was reduced according to the reduction percentage. The flexural strength
of Group 2 at a 10% reduction showed the highest degree of toughness among all groups. The void
shape and density influenced the mechanical properties tested.
Key Words: 3D printing, computer‑aided design, dental prosthesis design, manufactured materials, porous coordination

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 Abdullah Jasim Mohammed: Pubmed,Google Scholar