Question 589 · LDEK · Endodontic instruments
Indicate the true statements regarding root canal instruments:
1) the use of instruments featuring a non-cutting tip reduces the risk of the instrument getting stuck in the canal;
2) instruments made of a triangular cross-section wire are characterized by greater flexibility than those made of a rectangular cross-section wire;
3) instruments referred to as finders are manufactured in accordance with ISO standards;
4) instruments made of nickel and titanium are characterized by a low Young’s modulus, which makes them highly flexible;
5) C-files are made of a rectangular cross-section spiral and characterized by high rigidity;
6) greater taper instruments with a variable increase in the diameter over the entire length are only manufactured as hand-held instruments.
The correct answer is:
2) instruments made of a triangular cross-section wire are characterized by greater flexibility than those made of a rectangular cross-section wire;
3) instruments referred to as finders are manufactured in accordance with ISO standards;
4) instruments made of nickel and titanium are characterized by a low Young’s modulus, which makes them highly flexible;
5) C-files are made of a rectangular cross-section spiral and characterized by high rigidity;
6) greater taper instruments with a variable increase in the diameter over the entire length are only manufactured as hand-held instruments.
The correct answer is:
- A. 1,2,3.
- B. 2,3,4.
- C. 1,3,6.
- D. 1,4,5.
- E. 2,4,6.
Hint
Consider how cross-section affects core mass and flexibility, what a low Young's modulus means for NiTi, and which instruments are not ISO-standardised.
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