A-PRF 1 Article 1 Gingival recession 1 L-PRF Pouch and tunnel technique 1 Semilunar vestibular incision technique 1 adult 1 advanced platelet rich fibrin 1 clinical article 1 clinical effectiveness 1 clinical evaluation 1 clinical laboratory 1 clinical outcome 1 controlled study 1 disease classification 1 double blind procedure 1 female 1 gingiva disease 1 gingival index 1 human 1 intermethod comparison 1 male 1 medical documentation 1 outcome assessment 1 patient safety 1 plaque index 1 platelet-rich fibrin 1 postoperative period 1 randomized controlled trial 1 semilunar vestibular incision technique with pouch 1