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classification immunity crown lengthening mucogingival surgery resective therapy access therapy immune cells flap techniques incisions healing complications width of attached gingiva root coverage frenectomy papilla reconstruction ridge augmentation vestibular depth tfo history trauma review of literature evolution community dentistry research study designs nutrition periodontium periodontium cementum gingiva loss of interdental papilla esthetics local treatment gingival augmentation i-prf microneedling health and medicine furcation defect surgical regenerative therapy host cells netosis periodontal surgery chorion membrane periodontal regeneration intra-bony defects acute gingival infections acute periodontal infections abscess in periodontium nercotizing periodontal d endo-perio lesions problems in 1999classification autograft hemorrage palatine suture tissue engineering in perio probiotics bifidobacterium antimicrobial potential orthodontics periodontics ortho-perio conscious sedation dental implant surgery replication host response hiv herpes virus herpes simplex virus epstein barr virus human cytomegalo virus human papilloma virus sars cov-2 evidences diagnostic methods treatment clinically advanced flap connective tissue graft injectable platelet rich fibri 2017periodontal classification gray zone case diagnosis allografts dfdba fdba