Question 263 · LDEK · Endodontic instruments
Which of the following concerning ISO standards for root canal is true?
1) the number of root canal file refers to the diameter of its tip, which is measured in hundredths of a millimeter;
2) the number of root canal file refers to the diameter of its tip, which is measured in tenths of a millimeter;
3) traditional root canal files increase in the diameter of 0.04 mm per each subsequent millimeter of the length;
4) traditional root canal files increase in the diameter of 0.2 mm per each subsequent millimeter of the length;
5) the taper of traditional root canal files is 2%.
The correct answer is:
2) the number of root canal file refers to the diameter of its tip, which is measured in tenths of a millimeter;
3) traditional root canal files increase in the diameter of 0.04 mm per each subsequent millimeter of the length;
4) traditional root canal files increase in the diameter of 0.2 mm per each subsequent millimeter of the length;
5) the taper of traditional root canal files is 2%.
The correct answer is:
- A. 1,3.
- B. 1,4.
- C. 1,5.
- D. 2,4.
- E. 2,5.
Hint
An ISO size 25 file has a 0.25 mm tip; work out the unit and the standard increase in diameter per millimetre.
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