Evaluation of Root Resorption Following Different Mandibular Incisors Intrusive Mechanics

Inclusion Criteria: * Patient will be included in this study if has: * An age range between 12 and 16 years. * Deep overbite with excessive curve of Spee of more than 5mm * Over erupted lower incisors. * Permanent teeth are all present (except for third molar). * No previous orthodontic treatment. * No indications or symptoms of periodontal disease in the past or present, as determined by clinical and radiographic examination Exclusion Criteria: * Patients who needed surgery to fix skeletal problems. * Any previous trauma or root canal therapy * Missing lower incisor. * Patients with congenital dentoskeletal disorders