Carrasco, R., Román, R., Ojeda, M. and Vergara, C. 2015. Sonic versus ultrasonic activation for the cleaning of the root canal after post space preparation: an in vitro study. Journal of Oral Research. 4, 4 (Jul. 2015), 255-262. DOI:https://doi.org/10.17126/joralres.2015.050.