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. 2020 Oct 2;20:268. doi: 10.1186/s12903-020-01261-w

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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. 1 — The standard scanning pattern of data acquisition was demonstrated on the upper left side (a). The scan was started by a zig-zag movement from the incisive papilla (yellow circle) and finished at the border of the hard and soft palate (yellow box). The preparation of the STL file was demonstrated on the upper right side (b). Teeth were selected (step 1) and removed (step 2) from the scan, and only the palatal area was kept for alignment and surface comparison. The result of the surface comparison with the ISD method of an MZ subject was demonstrated on the lower left side (c), and with ITD method of an MZ twin pair was demonstrated on the lower right side (d). There is one order of magnitude difference between the two scales