Fracture and loosening of the implant can pose a serious impact as the fractured segment remaining inside the implant may prevent it from functioning efficiently. The harmony between the implant supported prosthesis and implant could be disrupted, leading to failure of the upper structure. Fistula formation and soft tissue inflammation are frequently associated with loose abutment screws. This case report involved an evaluation of the screw threads of a loosened abutment compared with those of a fractured abutment removed from the same patient by Scanning Electron Microscopy (SEM). According to the results of the SEM analysis, deformities in the screw threads of the loosened abutment were evaluated, and whether a loosened abutment should be rescrewed was considered.