Efficacy of ultrasonic activation of NaOCl and orange oil in removing filling material from mesial canals of mandibular molars with and without isthmus . J Appl Oral Sci [Internet]. 2016 Feb. 1 [cited 2024 Apr. 29];24(1):37-44. Available from: https://www.revistas.usp.br/jaos/article/view/112879