Background: Dental implants have revolutionized the field of dentistry. For ensuring successful dental implant treatment, accurate impression procedures are necessary for passively fitting prosthesis The present study was conducted to assess effect of implant angulation and implant number on the dimensional accuracy of definitive casts. Materials & Methods: 7 definitive casts with implant analogs placed in a triangular pattern were made from dental stone. 7 groups were made. Group I (control group): All three implants are perpendicular to the plane of the cast. Group II: Implant numbers 1 and 3 are at 5° convergence to the center implant (implant number 2). Group III: Implant numbers 1 and 3 are at 5° divergence to the center implant (implant number 2). Group IV: Implant numbers 1 and 3 are at 10° convergence to the center implant (implant number 2). Group V: Implant numbers 1 and 3 are at 10° divergence to the center implant (implant number 2). Group VI: Implant numbers 1 and 3 are at 15° convergence to the center implant (implant number 2). Group VII: Implant numbers 1 and 3 are at 15° divergence to the center implant (implant number 2). Implant analogs were secured in all definitive casts with cyanoacrylate. Results: Significant results were obtained while assessing the impact of dental implant number and the correlative effect between dental implant number and dental implant angulation (P< 0.05). While comparing the effect of parallel group from 5° divergence and 10° convergence groups significant results were obtained (P< 0.05). Conclusion: The accurate implant impressions can be made using an open tray technique for three implants angled up to 15°. The close proximity of implant angulation toward the right-angled direction results in higher precision of implant.