Inclusion Criteria:  Age range between 18 and 30 years. Class II division 1 malocclusion requiring extraction of upper first premolars. Mild to moderate skeletal class II malocclusion. Normal or excessive anterior facial height. No or mild crowding (tooth-size arch-length discrepancy ≤3 mm). Overjet >5 mm and <10 mm. Completion permanent dentition (regardless of third molars). No previous orthodontic treatment. No drug use or systematic disease that would affect the bone and tooth movement rate. Healthy periodontium and good oral hygiene.  Exclusion Criteria:  Patients with previous orthodontic treatment. Patients with severe skeletal dysplasia in all three dimensions. Patients suffer from systemic diseases or syndromes Patients on medication for systemic disorders, pregnancy or steroid therapy. Patients showing any signs of active periodontal disease Patients with severe crowding (≥ 3.5 mm) in maxillary arch Patients with missing or extracted teeth in maxillary arch except third molar.