This study evaluates the effect of citric acid demineralization in autogenous bone blocks consolidation. Half of participants will receive citric acid treatment at the bone block and recipient site. Other half will receive no demineralization treatment.

Autogenous bone grafts are indicated in areas where there is not enough bone height and/or width for implant installation. Treatment of bone surfaces with citric acid, promote a slight demineralization on surface that mimic natural processes of bone demineralization by osteoclasts. Thus, this treatment could accelerate the process of autogenous bone block consolidation to its recipient site.

Inclusion Criteria:

• Presence of atrophic anterior maxilla (width 1.5 to 4 mm)
• Absence of active periodontal disease.
• Enough bone width on donor sites (oblique line or ment)

Exclusion Criteria:

• Systemic disease that impede surgical procedure as blood diseases, endocrine diseases, impaired coagulation
• Smokers
• Pregnant women
• Patients receiving radiotherapy or chemotherapy
• Patients using bisphosphonates