Nogueira, Sandra Pillon, et al. “The Influence of Passive Ultrasonic Irrigation Associated With Different Irrigating Solutions on Radicular Dentin Microhardness”. Archives of Clinical and Biomedical Research, vol. 4, no. 4, July 2020, pp. 292-01, https://fortunejournals.org/ojs/index.php/acbr/article/view/14771.