Augmentation of Peri-implant Keratinized Mucosa Using a Combination of Free Gingival Graft Strip With Platelet-Rich Fibrin

Pre-operative phase: Eligible patients undergo clinical examination and medical record documentation. Written informed consent is obtained prior to enrollment. Participants are randomly assigned by drawing one of 22 sealed envelopes: odd numbers are allocated to Group A (strip free gingival graft with PRF) and even numbers to Group B (conventional free gingival graft). Baseline intraoral and extraoral photographs and intraoral scans (PLY format) are obtained. Intra-operative phase: * Group A (Experimental): PRF is prepared from venous blood. A strip free gingival graft is harvested from the palate and placed at the recipient site in combination with PRF. * Group B (Control): A conventional free gingival graft is harvested from the palate and placed at the recipient site. Post-operative phase: Follow-up visits are conducted at days 1, 3, 7, and 14, and at 1, 3, and 6 months post-surgery. At 1 month, healing abutments are placed and prosthetic treatment begins. Keratinized mucosa changes are assessed using pre- and post-operative intraoral scans. Post-operative pain is evaluated using the Visual Analog Scale (VAS), and soft tissue aesthetic outcomes are assessed at 3 and 6 months using a standardized aesthetic score.