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. 2020 Apr 7;20:97. doi: 10.1186/s12903-020-01090-x

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 5 — The cross-section through the two reference points of the terminal tooth (#2) in the case of local best fit at scanning origin (tooth 15) (a) and in the case of full arch alignment (b). The two double arrows (jade color) connects the two identical points between reference scan (blue) and test scan (transparent green, made by Planscan) in the 3D. The 3D distances (L) are shown in the attached tables. The colorful vectors in the cross-section, indicating the magnitude of the surface comparison values. Labels with color background show that surface deviation values at the points (2_b and 2_p) on the reference scan are considerably lower than the distances between identical points (L values). Furthermore, at the crossing point of the two surfaces (the label on the palatal site), it tends to zero. Multiple crossing points through the arch decrease the overall surface deviation value