Aim: Peri-implant complications can result in a process that includes implant removal and is related to anatomical conditions, implant design, remaining periimplant bone and defect type, and bone quality.The aim of this study was to assess how different implant geometries and thread designs in different periimplant bone defect types under a removal torque value could affect the stress distributions in the implants and surrounding bone employing finite element analysis (FEA).Material and Methods: Four different designs (Type-I: external hexagonal-cylindrical; Type-II: internal hexagonal-root form; Type-III: internal conical-cylindrical; Type-IV: Internal conical-root form) placed in the maxillary and mandibular posterior region with D2 and D3 type bone with three peri-implant bone defect models or as a control, fully osseointegrated dental implants were evaluated using the 3D-FEA method.The application of a reverse torque force of 10 Ncm to implants has been examined by comparing the stress distributions of the maximum principle and the minimum principle.Results: The stress transmitted to the cortical bone in the neck region was found to be higher than to the cancellous bone.Circular-type bone defects had an increasing trend for stress values towards the apical region.Type II and Type IV implants demonstrated the highest von Mises stress values in peri-implant defect models, especially on buccal sites.Discussion: In the presence of horizontal and circular bone defects, the implant surface reached higher stress values in 2/3 coronal sites remarkably for the root-form implants during implant removal.Reaching high-stress values in the buccal area has marked the critical importance of buccal bone preservation during implant removal procedures.