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. 2019 Apr 27;19:66. doi: 10.1186/s12903-019-0751-3

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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 — Comparison of trueness in palatal region in Group Tr1 between different superimposition methods. a. Absolute deviations of trueness in palatal region: in tests of within-subject effects, F (1.383, 47.009) =41.986, p < 0.0005, η² = 0.553. b. Signed deviations of trueness in palatal region: in tests of within-subject effects, F (1.162, 39.506) =0.730, p = 0.418, η² = 0.021. Note: Information shown in the boxplot are median, quartiles, minimum and maximum; the circle represents the outlier; asterisk (*) indicates statistical significance (p < 0.05)