Relationship between unintentional overfilling and the long-term outcome of primary root canal treatments and non-surgical retreatment: a retrospective radiographic assessment.

Abstract

AIM\nTo determine retrospectively the long-term radiographic outcome of root canal treatments and root canal retreatments with unintentional overfilling.\n\n\nMETHODOLOGY\nA total of 220 root canal treatments (143 primary/ 77 retreatments) with postoperative unintentional overfilling and performed by two endodontists during their 45 years of private practice were included in the study. Lateral condensation techniques and nine different sealers were used. Overfilling was confirmed with a post-operative periapical radiograph and patients were scheduled regularly for recall visits. Average recall time was 4.86 years (maximum= 30 years). Two calibrated observers evaluated the radiographs and determined the long-term outcome using the PAI score pooled in a 3-category scale. The persistence or resorption of the extruded material was registered. The Kappa coefficient (K) was calculated and a logistic regression was used for further analysis. Odds ratios and their 95% CI were estimated.\n\n\nRESULTS\nThe level of inter-observer agreement was 66.1%. Primary root canal treatments had a significantly (p=0.015) greater rate of success (91.6%) than retreatments (81.8%). Tooth location (p=0.019) was the only other factor that significantly affected the outcome. The type of extruded material, and its resorption or persistence did not relate to outcome. Persistence of extruded material was significantly affected by tooth location and recall time after treatment.\n\n\nCONCLUSION\nThe outcome of root canal treatment with unintentional overfilling was not associated with the type of extruded material or its resorption or persistence. The persistence of extruded material did not relate to a favorable or unfavorable outcome. This article is protected by copyright. All rights reserved.