Purpose: to study the mechanical properties and Finite Element Stress Analysis of three implant abutment materials. Materials and Methods : Fifteen bars (25mm length, 4mm. thick and 5mm.width)of three abutment materials ;High Performance Polymer Hybrid abutments , Nano-Fiber Reinforced Composite and Fiber Reinforced Composite divided into three groups were exposed to Flexure Strength and Deflection tests. Fifteen implant abutments (two parts abutment) covered by all ceramic crowns divided into three groups were exposed to Static Fracture Resistance test and Finite Element Stress Analysis .Results: Flexure Strength tests mean and standard deviation of bar specimens showed significant difference, where Gp I, II, III were 519.29±0.46), 200.74±0.33and 315.43±0.59) .Also, Deflection test mean and standard deviation were 3.052±0.040, 0.984±0.106, 2.028±0.027 receptively revealed significant difference. The comparison between fracture resistance mean and standard deviation of the tested abutment three groupswere 642.00±.5.637,306.00±30.496 and 514.40±12.915 respectivelyand revealed significant difference. Finite Element Stress Analysis of applied vertical load on the three abutment materials did not have clear difference but the least stresses created on bone with Nano-FRC abutment(16.2) followed with FRC (17.32) then BioHPP abutment (18.55).Conclusion: Fracture strength of BioHPP abutments with ceramic crowns had the potential to withstand maximum occlusal forces, also showed better fracture patterns than the FRC and NFRC abutments. and showed a better stress distribution on the set, suggesting a good mechanical behavior.