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. 2019 Dec 21;15:30. doi: 10.1186/s13005-019-0214-8

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© The Author(s). 2019

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. 4 — Explanation of the 2D measurements. Left: preoperative, Right: postoperative; a: coronal reference point; b: apical reference point (end points of the axis); c: axial length before surgery d: axial length after surgery; e: planned length of removal; f: actual resected length; g: planned depth of osteotomy; h: actual depth of osteotomy (for the measurements, the missing cortical was substituted by a straight line connecting the remaining cortical edges). Calculations: ARE = e-f; ODE = g-h