Transactions on Additive Manufacturing Meets Medicine
Vol 1 No 1 (2019): Trans. AMMM
https://doi.org/10.18416/AMMM.2019.1909S10T03

Material Properties, Structural Designs, and Printing Technologies

Measuring surface-connected porosity of complete 3d printed structures using a custom pycnometer

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Kevin Aroom (Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park Maryland, USA), Linnea Warburton (Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park Maryland, USA), William Bentley (Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park Maryland, USA), Lester Schultheis (Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park Maryland, USA and Center for Excellence in Regulatory Science and Innovation, University of Maryland, College Park Maryland, USA)

Abstract

3D Printed (3DP) medical parts are continuing to be adopted for a variety of uses. Part quality is a continuing concern, with one aspect being cleanliness and the ability to be effectively cleaned. Porosity is a property that makes cleaning more difficult. A method of using pycnometry is described to measure porosity in complete 3DP parts. Pycnometry uses changes in volume and pressure to calculate the volume of a sample. The system is able to identify small variations in sample volume, and could be used to compare the actual part volume with the expected volume.

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