Background: The angulation of the abutment can affect the success of the dental implant because it controls the forces applied on the screw. Objectives: The goal of this research had been to assess the impact of abutment angulation on an implant loaded at the posterior mandible on the resultant stresses & and fracture resistance. Methods: To study the fracture resistance, the following method will be used. Fifteen casts representing missed lower first molar will be constructed & and divided into 3 groups (5 samples each) according to the type of abutments used: 1. The model consists of a Dental implant (4x 10 mm), internal hexagon straight abutment  and crown height of ten ml., 2. Dental implant (4x 10 mm), internal hexagon,15-degree angled abutment and a crown height of ten mm., 3. Dental implant (4x 10 mm), internal hexagon,30-degree angled abutment and a crown height of ten mm. The three groups will be subjected to fracture resistance tests. The data will be collected, tabulated and statistically analyzed. Results: 15 angled abutments showed the best fracture resistance (Fracture resistance test) in comparison to straight and 30 angled abutments. Conclusion: Angulation 15 abutment increases fracture resistance of the overlaying CAM-milled zirconia single crowns than straight abutment.