Influence of Injectable Platelet Rich Fibrin on Different Orthodontic Tooth Movements During Clear Aligner Therapy

Inclusion Criteria

• •1\. Age ranges from 15 to 22 years. 2. Bilateral Class II molar relationship. 3. Skeletal Class I or mild Class II relationship. 4. Normal or decreased vertical height. 5. No posterior crowding or spaces. 6. Fully erupted maxillary first and second molars. 7. Congenitally missing or extracted third molars. 8. Good oral hygiene. 9. Absence of any periodontal disease and alveolar bone loss. 10. Absence of medications that may inhibit orthodontic movement
• •initial bonding appointment; 6. No required management with interproximal stripping, inter-maxillary elastics, open NiTi springs, and removable or extra-oral devices. Canine retraction Eligibility criteria
• •Age, 15 to 25 years; Class ii division 1 malocclusion with mild or no crowding; No previous orthodontic treatment; No systemic disease that might have affected bone formation or density, such as osteoporosis, hyperparathyroidism, or vitamin d deficiency; Adequate oral hygiene; Probing depth values not exceeding 3 mm across the Entire dentition; Adequate thickness of the attached gingiva (1-2 mm); No radiographic evidence of bone loss