In conclusion, the choice between titanium and PEEK meshes should consider patient-specific factors, clinical requirements, and surgeon expertise. The PEEK mesh, with its patient customized design enabled by CAD/CAM technology, offers significant advantages, including greater gained bone volume and reduced operative time. Its tailored fabrication ensures precise adaptation to the patient's anatomy, effectively maintaining the space required for optimal bone formation. The integration of such advanced technologies in regenerative procedures represents a significant step forward in achieving predictable outcomes and enhancing patient care. However, continued innovation and evaluation are crucial to refine these approaches and expand their applicability in oral rehabilitation

Inclusion Criteria:

• 1. Adult patient of both sexes presenting with partially edentulous maxillary ridge with horizontal bone defect. 2. The horizontal ridge dimension measured 2mm below the alveolar crest should range from 2-5 mm. 3. No local pathosis that may interfere with bone healing. 4. Good oral hygiene. 5. Age between 20-65 years old.

Exclusion Criteria:

• Patient taking any medication that may interfere with normal bone physiology or impair bone healing. 2. All patients suffering from any systemic disease that may affect bone healing. 3. Heavy smokers (more than 10 cigarette per day) 4. Patients with parafunctional habits such as bruxism and clenching 5. Poor interest and cooperation from the patient. 6. Patients that have undergone any horizontal augmentation procedure at the site of interest