Concentrated Growth Factor Versus Platelet Rich Fibrin in Revitalization of Necrotic Young Permanent Incisors

Inclusion Criteria: * Healthy patients with immature permanent incisors * Presence of clinical signs and symptoms of necrosis or chronic apical periodontitis. The chronic apical periodontitis signs and symptoms include little discomfort with intermittent episodes of pus discharge through the sinus tract. Exclusion Criteria 1\. Abnormal tooth mobility. * Positive history of allergic reaction, systemic diseases, severe emotional or behavioral problems. * Unrestorable teeth * Abnormal tooth mobility * Children with systemic, severe behavioral, or emotional problems