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. 2024 Jul 24;28(8):444. doi: 10.1007/s00784-024-05836-7

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© The Author(s) 2024

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/.

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Fig. 7 — Resin-dentin interfaces incubated with quenched fluorescein-labeled gelatin at T0 and T6 months. Upper image in each group was acquired in the green channel showing fluorescence in dentinal tubules and within the HL of the tested groups. The lower image in each group was obtained by merging the differential interference contrast (DIC) image (showing optical density of the resin-dentin interface) and the image acquired in the green channel. Abbreviations: D - dentin; HL – hybrid layer; R – resin composite; T0–24 h aging; T6–6 months aging