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Schematic illustration of GTR membrane combined with bone grafts therapy for periodontal regeneration. Adapted with permission from Chen et al. (2010a). Copyright 2010 Elsevier. (A) Periodontal defect with loss of PDL and alveolar bone. (B) Bone grafts in the defected site. (C) GTR/GBR membrane covered on the grafts. (D) Sewing for closure of the wound.
