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. 2016 Jun 8;17:17. doi: 10.1186/s40510-016-0131-3

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 8 — Stress distribution after activation of the quad-helix and NPE2 models in the cross-sectional view at the first deciduous molar (a, b), second deciduous molar (c, d), and first permanent molar (e, f)