Question 330 · LDEK · Endodontic instruments
Which of the following statements concerning nickel-titanium endodontic files is false?
- A. it is possible to see the signs of material fatigue on the surface of the instrument and they can indicate a higher risk of breakage.
- B. NiTi alloy is used for manufacturing both hand and engine-driven instruments.
- C. they should be used only after the preparation of a straight-line access to the root canal.
- D. they are less effective in preparing wide, oval root canals.
- E. NiTi instruments enable a safer root canal preparation as they retain the original shape and curvature of the canal much better.
Hint
Remember why the superelasticity of NiTi makes fracture from cyclic fatigue so hard for the clinician to foresee.
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