Question 612 · LDEK · Complications and errors
What is the most common cause of breakage of a nickel-titanium instrument in a root canal?
- A. cyclic fatigue of the material when the instrument is used in a curved root canal.
- B. excessive rotational speed.
- C. prolonged irrigation with EDTA.
- D. use in an overly wide canal.
- E. excessive axial pressure.
Hint
Think about what happens to the alloy at the point of curvature with every rotation of a NiTi file — repeated tension and compression.
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