Posterior analysis on failure cause of root canal therapy

Objective The reasons for treatment failure of after root canal. Methods Clinical analysis of 62 teeth with root canal therapy failure. Results Root canal filling root canal in 30, missing 12 teeth, 7 teeth periodontal disease, root canal overfilling 5 teeth, crown 4, other 4. Conclusion The preparation and filling caused by improper root canal cleaning is not thorough, closed again infection is a major cause of failure in root canal treatment is not close to the root canal system. And is related to the complex anatomical structure.