الفهرس 
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Abstract
Objectives: The aim of this study was to evaluate the stresses within screw-retained implant-supported anterior zirconia fixed dental prosthesis with different abutment angles. Materials and Methods: Five Epoxy resin casts were divided into five models according to implant placement angulations and each model was supported by two implants with 4.0 mm diameter and 10 mm length. group 0-0: both implants were 0-degree angulated, group 0-17.5: one implant was 0-degree angulated while the other was 17.5-degree angulated, group 0-35: one implant was 0-degree angulated while the other was 35-degree angulated, group 17.5-17.5: both implants were 17.5-degree angulated, group 35-35: both implants were 35-degree angulated. The frontal region of the maxilla was modelled with a cortical layer 1.5 mm thickness containing an inner cancellous core. Three-units monolithic zirconia fixed partial denture were designed and milled. Each zirconia fixed partial denture was seated over its corresponding abutment via prosthesis retaining screw. Two loading cases were applied obliquely (178 N) and horizontally (25.5 N). Stress and deformation distributions was evaluated by means of a Finite Element Analysis (FEA). Results: Stress and strain concentration in angled abutments was higher than that in straight abutments. However, angled abutments transferred lower levels of stress and strain to the bone compared to straight abutments. Conclusions: All values of deformations and stresses appeared on all models components were within physiological limits under all cases of load application.