Implantation in Posterior Maxilla in Cases With Insufficient Bone

Inclusion criteria for both groups: * Patients must have inadequate bone density in the posterior region of the upper jaw. * Patients should maintain good oral hygiene. * The surgical site must be free from infection. * There should be no contraindications for oral surgery. For the first group: \- Patients in the first group must have a palatal process of the maxillary bone determined by radiographic examination. Exclusion criteria: * Patients with adequate bone volume to receive an implant. * Patients with systemic diseases that impair metabolism or healing at the surgical site. * Patients with contraindications for surgery, including cardiovascular disorders, blood clotting disorders, anticoagulant use, or uncontrolled diabetes. * Patients receiving medications that affect bone metabolism, such as corticosteroids, oral contraceptives, hormonal treatments, or those undergoing chemical or radiological therapies.