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Question 93 (part 2) · LDEK · Irrigation and intracanal medicaments

Choose true statements regarding rinsing the canals during endodontic treatment:

1) total volume of NaOCl used during preparing one canal should not be smaller than 10 ml;
2) total volume of NaOCl used during preparing one canal should not be smaller than 6-7 ml;
3) contact time of 2% NaOCl during endodontic treatment should be at least 30 minutes;
4) contact time of 2% NaOCl during mechanical endodontic treatment may shorter, appropriate to the working time of rotary instrument;
5) after complete canal preparation, smear layer must be removed;
6) after complete canal preparation, smear layer should be left, and then used in the adhesion of sealant to the canal walls.
Correct answer is:
  1. A. 1,4,5.
  2. B. 1,3,5.
  3. C. 1,3,6.
  4. D. 2,3,5.
  5. E. 2,3,6.
Hint

Consider the total irrigant volume per canal, the contact time needed by low-concentration NaOCl, and what the smear layer contains.

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