Consequence of Injectable Platelets Rich Fibrin Versus Microosteopeforation on Root Resorption During Orthodontic Intrusion of Incisor Teeth

Inclusion Criteria: * 1\. Patients with age range between 12-16 years. 2. Overbite \> 40% indicated for maxillary intrusion. 3. Mild to moderate crowding of upper incisors. 4. All permanent teeth erupted (excluding 3rd molars). 5. No previous orthodontic treatment. 6. Good oral hygiene with no previous periodontal surgery. Exclusion Criteria: 1. \- Transverse and/or vertical skeletal dysplasia or craniofacial malformation. 2. Retained primary or missing permanent teeth in the maxillary anterior area, and any kind of tooth/root shape anomaly. 3\. Patients with root resorption, impacted canines, or dental anomalies. 4. Poor oral hygiene 5. Present or history of periodontal diseases. 6. Systemic diseases or regular use of medications that could interfere with orthodontic tooth movement. 7\. History of trauma affecting the maxillary incisors. 8. Endodontically treated upper anterior teeth.