Assessment of Bone Volume Changes in Immediate Implant Placement Using Allograft Versus Xenograft in Mandibular Molars

Inclusion Criteria: * Patients with non-restorable mandibular molars * Both sexes with age range from 25 years to 40 years * Good oral hygiene * Adequate alveolar bone dimensions for implant replacement * Adequate bone volume after extraction to achieve primary stability of the immediate implant * Co-operative patient Exclusion Criteria: * Patients with any systemic disease as uncontrolled diabetes or osteoporosis * Heavy smokers with smokers more than 10 cigarettes per day * Pregnancy * Patients with any signs of active infection or pus formation * Patients undergoing chemotherapy or radiotherapy, immunocompromised patients