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Root canal treatment is highly successful when done properly, with studies showing a success rate of over 95%. However, some root canals can fail over time due to a combination of factors, and retreatment may be necessary to save the tooth.
Endodontic failure cannot be attributed to a single reason. Success or failure is evaluated based on a combination of:
- Clinical criteria – symptoms such as pain or swelling
- Histopathological criteria – tissue health at the root tip
- Radiographic criteria – X-ray evidence of infection or improper filling
Proper diagnosis is essential before deciding on retreatment.
Retreatment is usually indicated in symptomatic teeth—those showing pain, infection, or other complications.
- If the patient is asymptomatic, even if the previous treatment was not perfect, retreatment can be postponed until necessary.
This careful evaluation prevents unnecessary procedures while protecting the tooth.
- Coronal Disassembly
Removal of old filling material from the crown and root. - Removal of Canal Obstructions
Extracting broken instruments, calcifications, or other debris blocking the canal. - Thorough Cleaning and Shaping
Re-instrumenting the canals to remove infection and prepare for obturation. - Disinfection
Using antiseptic solutions and techniques to eliminate remaining bacteria. - Final Obturation
Filling the canals properly to prevent reinfection and restore tooth integrity.
Not all teeth are suitable for retreatment. Before starting:
- Evaluate the infection location and extent
- Check remaining tooth structure
- Assess overall prognosis of the tooth
This ensures that retreatment is likely to succeed and avoids unnecessary procedures.
- Evaluate the infection location and extent
