Inclusion Criteria:• No systemic diseases or local pathosis that may affect bone healing. This will be verified through medical history, laboratory investigation and clinical examination by the physician.  Completely edentulous maxillary and mandibular arch.. Residual ridge covered by sufficient thickness of mucosa 2-3 mm as verified by probing depth by using plastic probe. All patients with maxillary insufficient bone quantity (horizontal and vertical dimensions) and insufficient bone quality D5(Housefields Units <) making it impossible to place root-form dental implants with a diameter of at least 3 mm and a length of at least 8 mm .as verified by CT. Sufficient inter-arch space as verified by probing. sufficient restorative space as verified by putty index technique Patient seeking for fixed prosthesis  Exclusion Criteria:  Patients with absolute contraindications for surgical procedures such as: active cancer ,immunocompromised patients Patients with relative contraindications such as: patients with history of para functional habits (bruxism, clenching), bad habits as heavy smoking and alcoholism.. Also patients with history of radiation therapy in the head and neck region Patients with contraindication for grafting procedures. Non cooperative patients neither who don't attend regular appointments nor following the instructions during construction procedures