Implants will be placed in posterior maxilla using two drilling methods; the osseodensification technique and conventional drilling protocols. Implant stability will be measured after implant placement , 1,2,3,4,6 and 8 weeks and 3 months later. Insertion torque will be evaluated at the termination of implant placement and crestal bone loss will be measured post-implant insertion, after 3 months and after 6 and 12 months of loading. Post-operative pain and patients' satisfaction will be assessed as well. implant survival will be assessed at the end of the follow up period

Inclusion Criteria:

• Age: >18 years; medically free,
• Partially edentulous patients in maxillary posterior area (premolar-molar area)
• Sufficient ridge height
• Sufficient ridge width
• Adequate soft tissue biotype.
• Patients with adequate inter-arch space for placement of implant prosthetic part.
• Cooperative patients with good oral hygiene
• Patients who accept to sign an informed consent.

Exclusion Criteria:

• Active periodontal diseases
• Parafunctional habits.
• History of radiation therapy to the head and neck
• Bone augmentation to implant site
• Smoking
• Pregnant females

the statistician will be masked