Jarrín Peñafiel, M. J., Castro Pallaroso, J. A., & Toscano Viteri, V. M. (2019). Periapical lesion treatment with retrograde filling and bone graft. A case report. Odontología Sanmarquina, 22(3), 205-210. https://doi.org/10.15381/os.v22i3.16711