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[A case report of root resorption treatment].

A case report of endodontic surgery of maxillary left lateral incisor with external root resorption which perforated the root canal was presented. The cause of this abnormality was due to chronic inflammation. The patient had the history of pain and swelling. After root canal filling by thermoplasticized warm gutta-percha technique, the resorption defect and the apical apex were filled with amalgam via a surgical approach. The patient remained asymptomatic 8 months later, radiographic appearance revealed a sign of bone repair.