Closed Sinus Tenting Using Densah Burs Osteotomy Versus Conventional Osteotomy in Localized Pneumatization

Inclusion Criteria: * No inflamed sinus * Minimum alveolar ridge height 5-6 mm * Medical free * Both genders males and females. Exclusion Criteria: * Remaining alveolar ridge height is less than 5mm * Patients should not have taken drugs, especially bisphosphonates or drugs altering bone metabolism, within 2 months before the inclusion in the study. * Subjected to irradiation in the head and neck area less than 1 year before implantation. * Patients having history of allergy to any drugs. * Patients who have a history of any concomitant from a major known medical problem and/or ongoing pharmacologic treatments * Untreated periodontitis. * Poor oral hygiene and motivation. * Uncontrolled diabetes. * Pregnant or nursing. * Substance abuse. * Psychiatric problems or unrealistic expectations. * Severe bruxism or clenching. * Immunosuppressed or immunocompromised. * Treated or under treatment with intravenous amino-bisphosphonates.