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. 2017 Aug 14;18:24. doi: 10.1186/s40510-017-0181-1

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© The Author(s). 2017

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. 4 — Definitions of linear and area measurements in the horizontal plane. D distance from the left maxillary incisor to the incisive canal (mm); CSA, area of the incisive canal (mm²)