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A critical incident in root canal therapy:

Lateral wear and instrument breakage in root canal treatment have some influence on the effect of root canal treatment. Mainly because the side wear or broken instruments under difficult root canal preparation, flushing and filling, resulting in root canal treatment failure rate increased; but with the application of root canal microscope, ultrasonic and good repair materials (such as MTA), the root canal treatment in the accident for timely treatment, improve the long-term effect.