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Question 140 (part 2) · LDEK · Irrigation and intracanal medicaments

Choose true statements regarding procedures and substances used for root canal rinsing:

1) canal may be rinsed with ultrasounds already at widening the canal to 15;
2) symptom of weak toxic effect of NaOCl is usually pain of treated tooth to biting and percussion;
3) chlorhexidine, which as rinsing solution is especially recommended in cases, where canal system was prone to oral cavity environment;
4) applying gel containing EDTA releases the dentist from using EDTA solution after complete canal preparation;
5) repeated rinsing with EDTA and NaOCl solutions is considered inappropriate.
Correct answer is:
  1. A. 1,2,3.
  2. B. 3,4,5.
  3. C. 1,4,5.
  4. D. 2,3,5.
  5. E. 1,3,4.
Hint

Think about how much space an ultrasonic tip needs to oscillate freely and what EDTA gel can and cannot do compared with EDTA solution.

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