Morphological assessment of the isthmus in mesial root canals of first mandibular molars. Acta Odontológica Latinoamericana, [S. l.], v. 36, n. 3, 2024. Disponível em: https://saio.org.ar/aol/index.php/1/article/view/38.. Acesso em: 16 sep. 2024.