The Use of Extended Platelet Rich Fibrin in Lateral Sinus Augmentation

Inclusion Criteria: * Patent ostium of maxillary sinus. * Patient with missing one or more posterior maxillary teeth. * Residual bone height of 3-6 mm, measured from the crest of alveolar ridge to the floor of the maxillary sinus at the planned implant site. * A ridge width at the site of implantation of \<5mm. * Platelets of normal range. * Good oral hygiene. * Patients in the age frame between 20 years and 60 years old. * No gender preface in selection of the patients. * A minimum crown height space of 8 mm. Exclusion Criteria: * Active sinusitis, cyst, tumors or root tips at the planned surgical site. * Patients with systemic diseases that contra-indicate the surgical procedure such as uncontrolled diabetes mellitus, bleeding disorders, serious osseous disorders, and mental disorders. * Heavy smoking and alcoholism. * Parafunctional habits such as bruxism and clenching. * Signs of acute infection or pus discharge. * Disturbed occlusion.