Fibrin Glue Versus Titanium Platelet-rich Fibrin in Lateral Sinus Lifting

Inclusion Criteria: * Patients requiring implant placement in the posterior maxilla. * Tooth extractions at the implant sites were performed at least 4 months before surgery. * Residual bone height between the alveolar bone crest and the sinus floor is 3-5 mm Exclusion Criteria: * Maxillary sinus pathologies (sinusitis, long-standing nasal obstruction). * Any disease-contraindicating surgery (e.g. uncontrolled diabetes). * Heavy smokers (smoke greater than or equal 25 cigarettes daily). * Acute oral infections. * Untreated periodontal disease (gingival index 2 and 3). * Poor oral hygiene ( Silness-Löe index (score 2-3) ). * A history of radiotherapy or chemotherapy of the head and neck region. * Pregnancy.