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. 2018 Nov 23;17:172. doi: 10.1186/s12938-018-0607-0

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© The Author(s) 2018

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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 6 — Elastic modulus of the PDL. a E₁ and E₂ of central incisors; b E₁ and E₂ of lateral incisors; c average elastic modulus at different loading rates; d comparison of average elastic moduli among different root levels; e comparison of average elastic modulus between medial and distal directions; f comparison of average elastic modulus among the three samples. + symbols and vertical bars represent the means and standard deviations of the specimens’ values