Objective: Evaluation of tooth rehabilitation with chronic periradicular periodontitis, submitted to endodontic retreatment and filled with PBS® CIMMO cement as a single endodontic obturator element. As well as propose protocol change in endodontic obturation using biological cement without incorporation of gutta percha. Method: Case Report: patient had a 3.7 tooth with conventional endodontic treatment and chronic periradicular periodontitis. Clinical examination revealed fistula and mobility. Initial tomography examination (Cone Bean tomography) determined the presence of extensive periradicular lesion. After removal of the intra-radicular nucleus, mechanical disbilling and chemical preparation of the root canal with continuous ultrasonic irrigation protocol (CUI) was performed. 5.5 % sodium hypochlorite and ethylene diamino tetraacetic acid surfactant were used as the auxiliary chemical. All channel filling was performed with PBS® biological cement. After six months, a clinical examination was performed. Absence of fistula and mobility was observed. The tomographic examination of preservation determined a decrease in the periradicular lesion. Conclusion: The protocol advocated in this case report determined reibilation of the tooth 37 and proposes further studies to establish a new biological obturator treatment for teeth affected by chronic periradicular periodontitis.

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