The aim of this study is to compare two different methods for occlusal analysis of implant - supported prosthesis (T-scan and conventional method with articulating papers) regarding the stresses transmitted to the implants.

Four implants will be inserted, two implants in canine regions and two implants in lower second premolar regions.

After 3 months, two identical overdentures will be constructed for the patient on implants.

The occlusion of each one of the two identical prostheses will be adjusted intraorally but according to different occlusal analysis:

• Group (A) : occlusal adjustments for the overdenture will be done according to articulating paper analysis.
• Group (B) :- occlusal adjustments for the overdenture will be done according to T-scan analysis.

The two prostheses will be retained on dummy implants on acrylic cast and will be loaded under chewing simulator.

The strain developed around the dummy implants will be measured. The data will be recorded manually then will be transferred into digital form. The obtained data will be recorded, tabulated and statistically analyzed using the appropriate tests for comparison within each group.

Inclusion Criteria:

• Age range from 55-65.
• Radiographic examination should reveal bone height more than 10 mm and crestal bone width not less than 5 mm of the inter-foraminal region.
• Residual bone and mucosa should be free from any pathological signs, bony undercuts, or neoplasia.
• Adequate salivary flow.
• Adequate mouth opening.
• Adequate inter-arch space.

Exclusion Criteria:

• Systemic diseases affecting metabolism of bone e.g uncontrolled diabetes, bone diseases, hyperparathyroidism and renal disease.
• Severe blood diseases (hemophilia etc.).
• Severe vascular heart disease.
• Liver Problems.
• Cerebral infarction .
• Severe immunodeficiency.
• Patients who are undergoing strong chemotherapy.
• Excessive alcohol consumption.
• Severe neuropsychiatric disease, mental disability, and narcotic drug addict
• Uncooperative patients