Injectable Platelet Rich Fibrin With Collagen Matrix in Treatment of Multiple Gingival Recession.

Inclusion Criteria: * Presence of at least two localized gingival recessions on either sides of the maxilla and/or mandible excluding molar region. * The cemento-enamel junction (CEJ) is visible in the teeth for root coverage procedures. * All recessions are type 1recession RT1 (cairo et al,2011) which correspond to Miller I\&II gingival recession * All patients must demonstrate adequate plaque control with a fullmouth plaque score less than 20% and with . * All patients at least 18 years of age and of both genders. Exclusion Criteria: * Smoker Patients . * Patients with diabetes. * Patients with a history of malignancy, radiotherapy, or chemotherapy for malignancy. * pregnant or nursing women. * Patients taking medications or having treatments with an effect on mucosal healing in general (e.g. steroids, large doses of antiinflammatory drugs). * Patients with a disease affecting connective tissue metabolism. * Patients allergic to collagen.