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. 2023 Nov 27;23:930. doi: 10.1186/s12903-023-03685-6

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© The Author(s) 2023

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 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. 4 — A. The relationship between the penetration depth of irrigants measured from the root canal surface and the percentage of killed bacteria.B. The mean effect of irrigants on the percentage of dead bacteria. Error bars indicate 95% confidence intervals. Slopes are almost parallel to the x-axis, indicating an insignificant effect of “depth”. The significant difference between the test (NaOCl and hClO₂) and saline groups are indicated by an asterisk. * p < 0.01