RESUMEN
Chronic pulpal inflammation and infection are the main predisposing factors for internal and external root resorption (IRR & ERR); however, merging of IRR and ERR is a rare lesion which rigorously alters the anatomy of root canals. this study reports a case of merged IRR and ERR in an asymptomatic maxillary left central incisor in a 33-year old caucasian woman that was managed by one-visit root canal therapy (RCT) using calcium-enriched mixture (CEM) cement. radiographic examination showed a short root with under-filled root canal obturation associated with ERR/IRR and an apical lesion. after thorough chemo-mechanical preparation, the root canal was obturated with CEM cement; one week later, the access cavity was permanently restored. clinical/radiographic examinations at 1-year follow-up revealed uneventful healing, reestablishment of lamina dura and stabilization of the resorptive defects. the treatment outcome demonstrates that one-visit RCT using CEM cement may be a viable treatment option in cases with merged external/internal root resorption. further clinical trials with a larger number of cases are suggested to document a higher level of evidence.