Question 414 · LDEK · Endodontic instruments
How long is the cutting part of a rotary root canal instrument, if the total length of the instrument without the grip is 21 mm?
- A. 20 mm.
- B. 19 mm.
- C. 18 mm.
- D. 17 mm.
- E. 16 mm.
Hint
Remember that ISO standardization fixes the cutting length regardless of the overall instrument length.
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