Assessing the morphology of selective laser melted NiTi-scaffolds for a three-dimensional quantification of the one-way shape memory effect
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Autor:innen
Autor:in (Körperschaft)
Publikationsdatum
03/2013
Typ der Arbeit
Studiengang
Typ
04B - Beitrag Konferenzschrift
Herausgeber:innen
Herausgeber:in (Körperschaft)
Betreuer:in
Übergeordnetes Werk
Behavior and Mechanics of Multifunctional Materials and Composites 2013
Themenheft
DOI der Originalpublikation
Link
Reihe / Serie
Reihennummer
Jahrgang / Band
8689
Ausgabe / Nummer
Seiten / Dauer
Patentnummer
Verlag / Herausgebende Institution
Verlagsort / Veranstaltungsort
San Diego, California
Auflage
Version
Programmiersprache
Abtretungsempfänger:in
Praxispartner:in/Auftraggeber:in
Zusammenfassung
NiTi is promising for the use as bone scaffold, because the pseudoelasticity or the one- and two-way shape memory
effect in the physiological window can mechanically stimulate the adherent cells. Such stimuli can enhance osseo integration and might reduce stress shielding associated with load bearing implants. The present study is based on the
additive manufacturing technique of selective laser melting (SLM) to fabricate three-dimensional NiTi scaffolds. We
demonstrate that the morphology of the scaffolds can be quantified using synchrotron radiation-based micro computed
tomography (SRµCT) and sophisticated registration software. Comparing the CAD file with the SLM scaffolds, quality
factors are derived. With respect to the CAD file, the overlap corresponds to (92.5 ± 0.6) %. (7.4 ± 0.42) % of material
was missing and (48.9 ± 2.3) % of excess material found. This means that the actual scaffold is less porous than
expected, a fact that has to be considered for the scaffold design. In order to quantify the shape memory effect during the
shape recovery process, we acquired radiographs rotating an initially deformed scaffold in angular steps of 0.2 degree
during controlled heating. The continuously acquired radiographs were combined to tomography data, showing that the
quality factors evolved with temperature as the scaffold height, measured by conventional thermo-mechanical analysis.
Furthermore, the data comprise the presence of compressive and tensile local strains in the three-dimensional scaffolds to
be compared with the physiological situation.
Schlagwörter
NiTi, Scaffold, Shape memory effect, Selective laser melting (SLM), Synchrotron radiation, Micro-computed tomography, Three-dimensional registration
Fachgebiet (DDC)
600 - Technik, Medizin, angewandte Wissenschaften
Veranstaltung
SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Evaluation and Health Monitoring 2013
Startdatum der Ausstellung
Enddatum der Ausstellung
Startdatum der Konferenz
10.03.2013
Enddatum der Konferenz
14.03.2013
Datum der letzten Prüfung
ISBN
ISSN
0277-786X
Sprache
Englisch
Während FHNW Zugehörigkeit erstellt
Ja
Publikationsstatus
Veröffentlicht
Begutachtung
Fachlektorat/Editorial Review
Open Access-Status
Closed
Lizenz
Zitation
BORMANN, Therese, Michael DE WILD, Felix BECKMANN und Bert MÜLLER, 2013. Assessing the morphology of selective laser melted NiTi-scaffolds for a three-dimensional quantification of the one-way shape memory effect. In: Nakhiah C. GOULBOURNE und Hani E. NAGUIB (Hrsg.), Behavior and Mechanics of Multifunctional Materials and Composites 2013. San Diego, California. März 2013. Verfügbar unter: https://irf.fhnw.ch/handle/11654/45802