Purpose: To compare outcome of NSRC-ReTx and surgery in failed cases.
N= 99 teeth. Max and Man anteriors with PA lesion, RCT done >4 years ago, or having symptoms.
•Re-Tx: Hand instrumentation to size 50 (0.5-1 mm from RG apex). Ca(OH)2 placed for 2 weeks, 0.5 NaOCl irrigation was used. Teeth were filled using lateral condensation
•Surgery: 1-2 mm of root resected, (filling removed by 40 size H-files), retro prepared 2-3 mm, filled with gutta percha softened with chloroform (vertical compaction).
•Patients were clinically and radiographically examined 6, 12, 24, and 48 months after treatment
Most highlighted Results:
•At 12 month: the healing rate of surgery was significantly higher, but after 4 years no significant difference was found.
•These findings may be explained by
(a) slower healing dynamics in the nonsurgical group
(b) the event of late “failures” in the surgical group (4 cases classified as healed after 1 yr failed at the final follow-up)
More rapid healing was observed in surgery group, but no difference was found at longer F/U periods.