Department of Endodontics Hospital of Stomatology Jilin University Changchun 130021 Jilin Province China;
Department of Endodontics Hospital of Stomatology Jilin University Changchun 130021 Jilin Province China;
Department of Periodontics Hospital of Stomatology Jilin University Changchun 130021 Jilin Province China;
Department of Endodontics Hospital of Stomatology Jilin University Changchun 130021 Jilin Province China;
Apical bone defect; Endo-perio lesion; Primary endodontic lesion; Root canal treatment; Nonsurgical root canal treatment; Conservative; Case report;