Main

Gorni FGM, Gagliani MM J Endodon 2004; 30: 1–4

In an Italian endodontic clinic, 452 consecutive retreatments in 451 patients of mean age 41 yrs (range 16-74) were followed up for 2 yrs, with 26 drop-outs. Teeth were classified as those where root canal morphology was respected by the previous root treatment (RCMR) and those where it was altered (RCMA).

Success rates for retreatment of teeth without previous apical lesions were 92% for RCMR teeth and 84% for RCMA, and for teeth with such lesions, respectively 84% and 40%. Failure rates were highest for RCMR teeth where canals were partially or completely occluded, and for RCMA teeth with alterations of canal curvature or various types of perforation.