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. 2019 Feb 20;9:2347. doi: 10.1038/s41598-019-38818-x

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© The Author(s) 2019

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Some morphological traits identified in Dushan 1 teeth. (A) buccal view of right P⁴. Arrow indicates the buccal vertical groove. (B) Distal view of right P³ showing the divergent roots and basal bulging. (C) Occlusal view of right P³. (D) Occlusal view of left P⁴. (E) Buccal view of left P₃. Arrow indicates the buccal groove. (F) Occlusal view of left C¹. (G) Occlusal view of right P₃. (H) Occlusal view of left P₄. Note the pronounced crown buccal vertical grooves, basal bulging and complicated occlusal morphologies in all teeth. (All the EDJ images are not scaled).