Zirconia can be considered as an alternative and innovative material suitable for GBR because it has high biocompatibility, together with a scarce tissue integration. Zirconia barriers could be a predictable and alternative barrier material for GBR in terms of (i) biocompatibility, (ii) ease of use and removal, (iii) exposure management, (iv) bone regeneration outcomes.

Inclusion Criteria:

• Patients are systemically medically free according to the American Society of Anesthesiologists (ASA) considered as ASA I.
• Ability to maintain good oral hygiene as evidenced in recall visits.
• patients who had a partial or completely edentulous alveolar ridge with apparent 3D defect following teeth loss.
• All patients were free from any local or general disease that may interfere with bone healing and had no history of previous grafting procedure at the designated edentulous ridge.
• The ridge had to exhibit severe vertical and horizontal (3D) alveolar ridge deficiency with alveolar ridge height less than 7 mm from the alveolar crest to the inferior alveolar canal and width less than 5 mm which was firstly measured by CBCT, or a clinically apparent increase in inter-arch space relative to the adjacent natural teeth.
• Pre-operative clinical assessment of soft tissue coverage was done to cover the graft and its membrane, in addition to assessment of occlusion and inter-arch distance should allow for the graft, membrane, implan and the future prosthesis.

Exclusion Criteria:

• Smoker (> 25 cigarettes/ day).
• Patients undergoing radiotherapy or chemotherapy
• Patients having infection or local lesions in the area of surgery.
• Patients with diabetes mellitus or bone diseases which may compromise the results.
• Patient with poor oral hygiene or active periodontal disease.
• Patient with limited mouth opening.
• Participation in other clinical trials