Gingival Recession Treatment With Concentrated Growth Factor(CGF)

Inclusion Criteria: * age≥18 * systemically and periodontally healthy non-smoker patients * multiple, adjacent, bilaterally Miller class I * recession depth ≥2 and ≤5 mm, probing depth≤3 mm, located lateral, canine or premolars on same arch(maxilla or mandibula) * identifiable cemento-enamel junction * absence caries or restoration on buccal surface, endodontic treatment or problem * palatal donor tissue thickness ≥3 mm for SCTG Exclusion Criteria: * patients have smoking habit or systemic diseases that might be contraindication for periodontal surgery * the presence of using medication affect that blood clotting mechanism and wound healing * previous periodontal surgeries in gingival recession areas * pregnancy, lactation,or oral contraceptive drug intake for female patients * insufficient oral hygiene (full- mouth plaque and bleeding scores ≥15% after phase I periodontal treatment) * unchanged traumatic tooth-brushing habit