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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 (http://creativecommons.org/licenses/by/4.0/).
(A,B) Marrow portion. In the apical portion, a layer of osteogenic matrix (OM) inside the concavities was observed close to the implant surface and it was clearly delimited from the bone marrow by a dense band (black arrows) (Acid fuchsin-Toluidine blue 18X).