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Schematic diagram of a tri-layered membrane for simultaneous alveolar bone and aligned PDL regeneration. Adapted with permission from Qasim et al. (2017), doi.org/10.1016/j.dental.2016.10.003, by the terms of the Creative Commons Attribution License (CC BY), http://creativecommons.org/licenses/by/4.0. Copyright 2017 Elsevier.
