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. 2015 Oct 13;10(10):e0140278. doi: 10.1371/journal.pone.0140278

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© 2015 Zheng et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 3 — The surface contact angles of zirconia decreased significantly after the helium APDBD plasma treatment for 30, 60 or 90 s. Data are shown as means ± SD (n = 9). Identical letters indicate no significant difference for each value (p > 0.05).