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Additively manufactured mesh-type titanium structures for cranial implants : E-PBF vs. L-PBF
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- Lewin, Susanne (author)
- Uppsala universitet,Tillämpad materialvetenskap
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- Fleps, Ingmar (author)
- ETH Zurich
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- Åberg, Jonas, 1982- (author)
- Uppsala universitet,Tillämpad materialvetenskap
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- Elsevier, 2021
- 2021
- English.
- In: Materials & design. - : Elsevier. - 0264-1275 .- 1873-4197. ; 197
- Journal article (peer-reviewed)
Abstract
Subject headings
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- A patient-specific titanium-reinforced calcium phosphate (CaP–Ti) cranial implant has recently shown promising clinical results. Currently, its mesh-type titanium structure is additively manufactured using laser beam powder bed fusion (L-PBF). Nevertheless, an electron-beam (E-PBF) process could potentially be more time efficient. This study aimed to compare the geometrical accuracy and mechanical response of thin titanium structures manufactured by L-PBF (HIPed) and E-PBF (as-printed). Tensile test (ø = 1.2 mm) and implant specimens were manufactured. Measurements by μCT revealed a deviation in cross-sectional area as compared to the designed geometry: 13–35% for E-PBF and below 2% for L-PBF. A superior mechanical strength was obtained for the L-PBF specimens, both in the tensile test and the implant compression tests. The global peak load in the implant test was 457 ± 9 N and 846 ± 40 N for E-PBF and L-PBF, respectively. Numerical simulations demonstrated that geometrical deviation was the main factor in implant performance and enabled quantification of this effect: 34–39% reduction in initial peak force based on geometry, and only 11–16% reduction based on the material input. In summary, the study reveals an uncertainty in accuracy when structures of sizes relevant to mesh-type cranial implants are printed by the E-PBF method.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Medicinteknik -- Medicinsk material- och protesteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Medical Engineering -- Medical Materials (hsv//eng)
Keyword
- Additive manufacturing
- Electron beam melting
- Powder bed fusion
- Finite element models
- Surface roughness
- Cranial implant
- Engineering Science with specialization in Materials Science
- Teknisk fysik med inriktning mot materialvetenskap
Publication and Content Type
- ref (subject category)
- art (subject category)
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