Effect of implant splinting and angulations, abutment height and prosthesis materials on induced stresses in bone are matter of debate. The aim of present study was evaluation of the influence of implant crown splinting and use of angulated abutment on stress distribution in implant body and surrounding bone by Finite Element Analysis (FEA). For this study 3 models with 2 implants in site of mandibular left second premolar and first molar were designed: 1- both implants, parallel to adjacent teeth, with 4 and 6mm straight abutments, 2- anterior implant with 15? distal angulations and Posterior implant was placed parallel to adjacent tooth with 4 and 6mm straight 15? angulated abutments, 3- both implants with 15?distal angulations and parallel to each other with 4 and 6mm 15? angulated abutments. Restorations were modeled in two shapes (splinted and non-splinted) and two prosthesis materials (glass ceramic- CoCr, glass ceramic- Zr). Loading in tripod manner as each point 50 N and totally 300 N was applied on distal fossa of second premolar and central fossa of first molar. Stress distribution in relation of splinting or non-splinting restorations and angulations was done with ABAQUS6.13. Splinting the restorations and shorter abutments in all situations, led to lower stresses in all implant bodies, cortical bone and spongy bone except for the spongy bone around angulated first molar. Magnitudes of stresses showed angulated implants in non- splinted restoration causing lower stress distribution in implant body and bone but in splinted models more stresses in implant body and cortical bone were seen in comparison with straight abutment. Stresses in non-splinted and splinted restorations in cortical bone of angulated molar region were more than straight implants. Implant restorations splinting lead to better distribution of stresses and lower stresses in implant bodies and bone in compression with non-splinted restorations especially when load be applied off center to implant body. Angulations of implant can reduce stresses when applying load is off center. Longer abutment, even in acceptable range leads to more stresses in bone and implant bodies specially in combination with off center loading. Materials with different elastic modulus have no difference in stress distribution. Keywords : Angled dental implant, Finite element Analysis, abutment, stress