Apexification in a mandibular first molar with a middle mesial canal - Quiñones Pedraza, Jesús Alejandro; Flores Treviño, Jorge Jaime; Cruz Fierro, Norma; González Meléndez, Rosalva; Elizondo Elizondo, José; Zavala Vargas, Larissa Argentina; Rosa Moreno, Daniel Alberto de la (2018)