Outcome of single- versus two-visit root canal retreatment in teeth with periapical lesions: A randomized clinical trial.

No statistically significant difference was observed in terms of healing in 24-month follow-up of retreatments completed in single visit or two visits in asymptomatic teeth with periapical lesions. The size of the periapical lesion and initial apical level of root canal filling have affected the outcome of root canal retreatment.