Osseodensification Versus Conventional Drilling Effect on Implant Stability

Inclusion Criteria: * (a) Bilateral edentulism in the maxillary posterior region dating back more than 6 months, * (b) sufficient bone height (distance between the bone crest and maxillary sinus \>8 mm) and width at the alveolar crest (≥6 mm) that would not necessitate bone augmentation, * (c) at least 2 mm vestibular keratinized mucosa width and 3 mm mucosa thickness, * (d) full-mouth plaque and bleeding scores \<20%. Exclusion Criteria: * patients with systemic diseases, conditions, or used medications having the potential to impair surgery, bone, and wound healing dynamics (such as diabetes) will be excluded. * patients who are allergic to antibiotics and non-steroidal anti-inflammatory drugs * bone height \<8mm * ridge and soft tissue deficiencies requiring augmentation procedures and * endodontic or periodontal lesions neighboring the edentulous sites will be also excluded.