Fourteen-month postoperative follow-up. a Periapical radiography, complete bone remineralization of the periapical lesion of the distal root is observed. b Cone-beam computed tomography, coronal section. Arrow: partial bone remineralization of the previous lesion is observed. c Cone-beam computed tomography, axial view on the middle third of the roots. Obturation of the four canals is observed. d Axial view of the apical third of the roots (1mm from the apex). Arrow: the absence of sealing material in the radix entomolaris canal is observed. e Cone-beam computed tomography, three-dimensional rendered image. Arrows: radiopaque changes in the last millimeters of the mesiobuccal and radix entomolaris canals are observed Abbreviations, L: lingual; B: buccal.