Retreatment vs. apicoectomy vs. extraction — how endodontists decide

Retreatment is a non-surgical redo through the crown — the existing root canal filling is removed, the canals are re-cleaned and re-shaped, and the tooth is re-sealed. Apicoectomy (endodontic microsurgery) is a surgical approach: a small flap is raised at the gum, the root tip is accessed from outside, the apical 3 mm is resected and sealed with bioceramic, and the flap is closed. Extraction-with-implant removes the natural tooth and replaces it with a titanium fixture + crown — different procedure, different specialty, different long-term tradeoffs.

Decision factors: (1) quality of the existing root canal — if it was under-filled or missed a canal (e.g., MB2 in maxillary molars), retreatment usually wins; (2) quality of the coronal restoration — if the crown is sound, surgery may preserve it; if the crown is failing, retreatment lets you redo both; (3) accessible apical anatomy on CBCT; (4) periapical lesion size and location; (5) patient-specific factors (medical history, prior surgical outcomes, restorability of the crown). The AAE Treatment Options for the Compromised Tooth framework is the standard reference.

When the existing root canal had a correctable problem — missed canal, under-filled, contaminated due to delayed crown placement — retreatment is generally tried first because it addresses the cause inside the canal system. Apicoectomy is preferred when the coronal restoration is sound and intact and the issue is at or near the root tip, when retreatment isn't feasible (separated instruments, ledged canals, perforations), or after a failed retreatment.

Published outcomes vary, but the modern literature consistently shows: non-surgical retreatment ~70–85% success at 4+ years; contemporary apicoectomy with surgical microscope, ultrasonic root-end preparation, and bioceramic filling ~85–95% short-term success. Implants have high osseointegration rates but a different failure profile (peri-implantitis, biological complications) and lose proprioception that natural teeth retain.

Vertical root fracture extending below the bone, severe internal or external resorption that compromises root structure, non-restorable crown breakdown, or a tooth where retreatment + surgery have both already failed. The AAE framework calls these 'unfavorable' cases — when the natural tooth genuinely can't be saved on a reasonable prognosis, an implant is a strong replacement.

You'll get all three explained — what each procedure involves, the published success rates, the cost differential, and the long-term tradeoffs — and then a specific recommendation based on your case. Patients deserve the menu before the suggestion, especially for an irreversible decision like extraction.