Programme

Unfurtunately the monastery Irsee has been closed by the Bavarian government due to the corona virus.

Therefore we have decided to offer the conference as a web conference only.

In those unpredictable times, protecting our participants’ health has the highest priority for us!

The scientific exchange must not come to a complete standstill and we believe that with this web solution we have found a way to keep the scientific community going.

In order to participate in the livestream of the conference as easy as possible and to give your presentation, we recommend the use of the web browsers Google Chrome or Microsoft Edge.

Here you can find detailed instructions for using the livestream.

As a participant of the Bioinspired 2020 you have received an e-mail containing the login data for the web conference.

The login data for the sessions are provided daily.

In order to allow all conference participants access to the posters, we ask you to upload your poster by login on the conference homepage and clicking on the button "My Submission" in the upper right corner of the conference homepage. Then select the submission to which you want to upload the poster and upload the poster at the bottom of the page.

Furthermore we would like to ask all poster authors to prepare 4 PowerPoint slides to present your poster to the audience.
Please also include your contact details on the digital poster to allow participants to reach you with questions.

Please note that your poster will be pictured publically.

As poster author you can upload your poster similar to the way you submitted your abstract.
Click on "My Submissions" in the upper right corner at the homepage.

Poster documents can be found by opening the respective abstract in the online programme.
If a poster document has already been uploaded for the abstract, it can then be opened and downloaded.

Please note that your poster will be pictured publically.

You can ask your questions via chat already during the presentations!
Please use for this the Q&A (F&A) button!

For further scientific exchange we implemented a discussion forum on the homepage of the DGM.
Please visit discussion.dgm.de and use your DGM or Bioinspired user credentials to login.

Back to overview

Lecture

Substituting ivory with a 3D-printable material

Wednesday (18.03.2020)
11:50 - 12:10

Ivory was a popular material for numerous religious, art and every-day objects because of its aesthetic looks and convenient workability. Since the introduction of the ivory trading ban by the Convention on International Trade in Endangered Species (CITES) in 1989 many natural and synthetic materials were used to substitute ivory. These materials should represent especially the aesthetic characteristics of ivory by means of the color, translucency and haptics. This also includes the appearance of the so-called Schreger lines, which are visible at the cross-section of an elephant or mammoth tusk and particularly difficult to reproduce. Typically, an ivory substitute material is only available in bulk and, therefore, needs to be carved into shape. To restore sometimes very complex and delicate artefacts, it is reasonable to develop a resource-friendly substitute that can be built by additive manufacturing.

The technique used here derived from stereolithography, where a photosensitive resin is polymerized layer by layer with a UV laser. Calcium phosphate particles are added to the resin, similar to the morphology of ivory that consists of an organic matrix with embedded hydroxy apatite platelets. The solids loading, which was around 55 wt.%, was adjusted to fit the translucency of ivory. At this content, also the Young’s modulus of about 8 GPa and the density of about 1.79 g/cm3 are comparable to the values for ivory found in literature. Small quantities of yellow and red color pigments were added to the mixture to modify the basic color.

A surface texture was applied onto the modeled artefacts that mimics the appearance of the Schreger lines. The printing layer thickness for the material testing specimens was 100 µm, whereas, for the recreation of the cultural artifacts the printed layers were only 25 µm thick to enhance the accuracy. With further staining and polishing of the surface, an optical imitation of natural ivory was achievable. This new solution for substituting ivory shows, therefore, promising results and advantages over already existing substitute materials.

 

Speaker:
Additional Authors:
  • Dr. Konstanze Seidler
    Cubicure GmbH
  • Richard Addison
    Addison KG
  • Elena Holzhausen
    Erzdiözese Wien
  • Prof. Jürgen Stampfl
    TU Wien