SURVIVAL OF ENDODONTIC-PERIODONTAL LESIONS FOLLOWING CONVENTIONAL ROOT CANAL TREATMENT

Abstract

Endodontic-periodontal lesions (EPLs) are characterized by concurrent involvement of pulpal and periodontal tissues, complicating clinical management. Teeth diagnosed with endodontic-periodontal lesions (EPLs) and treated by postgraduate endodontists at Chulalongkorn University were retrospectively evaluated. Lesions were stratified according to Herrera’s classification, and 4-year tooth survival was assessed. Tooth survival following treatment of endodontic-periodontal lesions is high in the short term but decreases over time. At 1-year, overall tooth survival was 98%, decreasing to 85% at 4-years depending on handling of missing data. When stratified by Herrera’s classification, survival remained high across all groups at 1-year (91-100%). At 4-years low grade lesions demonstrated more favorable outcomes (82-83%), whereas advanced lesions showed reduced survival, with rates as low as 42%. Variations in survival were observed across both periodontal status and lesion severity categories. Stratification using Herrera’s classification demonstrates that lesion severity and periodontal status significantly influence prognosis, supporting its value as a clinically relevant framework for outcome assessment.

Keywords: Endodontic-Periodontal Lesions; Tooth Survival; Herrera Classification