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. 2022 May 6;22:157. doi: 10.1186/s12903-022-02195-1

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© The Author(s) 2022

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. 6 — Pictures of the oral mucosa of the mandibula of pig cadavers were treated with the Dental water jet (left column, A1–B1) and a powder jet device (right column, A2–B2). Upper panel shows the tissue before (A) and the lower panel after treatment (B) in the region of keratinised gingiva tissue (x) and non-keratinised gingiva (y). The Dental water jet was used with 5 different power settings (L1–L5). Three different areas were tested for the powder jet device. No abrasion is seen in the keratinised mucosa near the teeth (x-range), tissue abrasion and blistering are observed in the non-keratinised mucosa (y-range)