Additively manufactured mesh-type titanium structures for cranial implants: E-PBF vs. L-PBF

Additively manufactured mesh-type titanium structures for cranial implants : E-PBF vs. L-PBF

De två första författarna delar förstaförfattarskapet
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.

TEKNIK OCH TEKNOLOGIER Medicinteknik Medicinsk material- och protesteknik hsv//swe
ENGINEERING AND TECHNOLOGY Medical Engineering Medical Materials hsv//eng
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

Fleps, IngmarETH Zurich (författare)
Åberg, Jonas,1982-Uppsala universitet,Tillämpad materialvetenskap(Swepub:uu)jooab683 (författare)
Ferguson, Stephen J.ETH Zurich (författare)
Engqvist, Håkan,1972-Uppsala universitet,Tillämpad materialvetenskap(Swepub:uu)hakaengq (författare)
Öhman-Mägi, CarolineUppsala universitet,Tillämpad materialvetenskap(Swepub:uu)caroh395 (författare)
Helgason, BenediktETH Zurich (författare)
Persson, CeciliaUppsala universitet,Tillämpad materialvetenskap(Swepub:uu)cecpe877 (författare)
Uppsala universitetTillämpad materialvetenskap (creator_code:org_t)

Av författaren/redakt...: Lewin, Susanne; Fleps, Ingmar; Åberg, Jonas, 19 ...; Ferguson, Stephe ...; Engqvist, Håkan, ...; Öhman-Mägi, Caro ...; visa fler...; Helgason, Benedi ...; Persson, Cecilia; visa färre...

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