Barbosa, Gustavo Augusto Seabra, et al. “Effect of Different Torque Levels on the Implant Abutment Interface Using Castable ‘UCLA’ Abutments”. Brazilian Journal of Oral Sciences, vol. 4, no. 15, Nov. 2015, pp. 919-22, doi:10.20396/bjos.v4i15.8641858.