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    3D Biomimetic Tongue-Emulating Surfaces for Tribological Applications

    Year: 2020

    Journal: ACS Appl. Mater. Interfaces, Volume 12, NOV 4, page 49371–49385

    Authors: Andablo-Reyes, Efren; Bryant, Michael; Neville, Anne; Hyde, Paul; Sarkar, Rik; Francis, Mathew; Sarkar, Anwesha

    Keywords: biomimetic; surface engineering; 3D printing; mesh generation; Poisson point process wettability; soft tribology; lubrication; friction

    Oral friction on the tongue surface plays a pivotal role in mechanics of food transport, speech, sensing, and hedonic responses. The highly specialized biophysical features of the human tongue such as micropapillae-dense topology, optimum wettability, and deformability present architectural challenges in designing artificial tongue surfaces, and the absence of such a biomimetic surface impedes the fundamental understanding of tongue-food/fluid interaction. Herein, we fabricate for the first time, a 3D soft biomimetic surface that replicates the topography and wettability of a real human tongue. The 3D-printed fabrication contains a Poisson point process-based (random) papillae distribution and is employed to micromold soft silicone surfaces with wettability modifications. We demonstrate the unprecedented capability of these surfaces to replicate the theoretically defined and simulated collision probability of papillae and to closely resemble the tribological performances of human tongue masks. These de novo biomimetic surfaces pave the way for accurate quantification of mechanical interactions in the soft oral mucosa.
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