RESUMO
Key clinical message: A successful management of an advanced external cervical resorption using a conservative approach with CBCT, dental operating microscope, and a new bio-ceramic material. Abstract: External cervical resorption (ECR) is a pathologic condition that is initiated on the external aspect of the root, below the epithelial attachment in the cervical position. This article will report a case of external cervical resorption (ESR) in an advanced stage, which was asymptomatic and was incidentally detected in a follow-up radiograph after the end of orthodontic treatment. Cone-beam computed tomography (CBCT) was prescribed to accurately diagnose the resorptive lesion and differentiate it from internal root resorption (IRR), and the final diagnosis was Heithersay's class IV ECR. Considering the health of the periodontium and the absence of attachment loss, it was decided to use a conservative internal approach to the management of this case. After the treatment, the patient was asymptomatic and the radiographic examinations showed no signs of peri-radicular pathology during the follow-up period. With the correct case selection and the availability of the appropriate materials and equipment such as a dental operating microscope (DOM) and bio-ceramic materials, the internal approach can be a successful and minimally invasive treatment, even for the management of advanced ECR cases.