Crestal Bone Level After Allogenic Bone Ring With Simultaneous Dental Implant Placement

Inclusion Criteria: 1. Medically free form any systemic diseases that contraindicate the surgical procedures or affect predictable outcomes and non-smoker subjects. 2. Atrophic mandibular distal region requiring vertical augmentation. 3. Good oral hygiene and healthy keratinized mucosa. Exclusion Criteria: 1. Presence of acute dentoalveolar infection or any pathologic lesions. 2. Totally edentulous patients and patients requiring massive reconstruction and augmentation procedures. 3. Patients with history of previously failed augmentation procedures, or failed implant placement at the intended augmentation region.