[Expert consensus on nonsurgical endodontic retreatment]

Nonsurgical endodontic retreatment refers to the non-surgical endodontic treatment that needs to be performed again on tooth that had undergone failed root canal treatment due to various reasons. For most post-treatment endodontic diseases, nonsurgical retreatment is the best way to remove bacteria from root canal system. There are still multiple controversies in the case selection, treatment plan determination, and clinical operation details of nonsurgical endodontic retreatment, far from forming a scientific and systematic expert consensus at present. This consensus provides detailed guidance on the indications, contraindications, operation principles, efficacy evaluation and prognosis of nonsurgical endodontic retreatment, so as to improve the success rate and reduce complications. By establishing an individualized retreatment system for root canal therapy, it is possible to provide clinicians with more accurate and comprehensive treatment references, for better preserving the function of teeth that possess failed root canal therapy.