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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Group 6 (BiodentineU07): some interdigitation between the adhesive and cement. A less deep hybrid layer is observed ① between the adhesive ② and the BiodentineTM ③. Composite resin ④ (original magnification 500× and 1000×).