Sousa MP, et al. - Eighty implants involved in polyurethane cylinders were analyzed to estimate the torque before and after fatigue (screw placement and removal, respectively), single load-to-failure (compression test), and stress concentration of straight as well as angled abutments. They installed abutments for cemented prostheses with a torque of 20 Ncm. They manufactured 80 titanium structures and cemented them on the abutments with zinc-phosphate cement. They observed angled abutments, less competent in managing the installation torque with less resistance during the single load-to-failure test. They noted greater von Mises stress concentration for those receiving angled abutments in the cervical region. They concluded straight abutments with a better prognosis and less susceptibility to mechanical failures.