Ultrasonic Technique to Retrieve a Rotary File from the Root Canal of a Mandibular Molar: A Case Report: Successful removal of broken files from the root canal using ultrasonic instruments. Journal of Advances and Scholarly Researches in Allied Education, [S. l.], v. 16, n. 6, p. 3268–3271, 2019. Disponível em: https://ignited.in/index.php/jasrae/article/view/11917. Acesso em: 4 apr. 2026.