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Question 273 · LDEK · Root canal obturation

Which of the following about adjusting the main standard gutta-percha cone to root canal walls is true?

1) size of the gutta-percha cone should be one size smaller than the last file used for root canal preparation along its working length;
2) while removing the fitted gutta-percha cone from the root canal one should overcome a slight resistance;
3) if gutta-percha cone placed in the root canal cannot reach the proper length -one size larger cone should be selected;
4) if gutta-percha cone extends beyond the physiological foramen - one size larger cone should be selected;
5) after gutta-percha cone fitting taking of the X-ray is recommended.
The correct answer is:
  1. A. 1,2,3.
  2. B. 1,2,4.
  3. C. 1,4,5.
  4. D. 2,3,4.
  5. E. 2,4,5.
Hint

The master cone should match the master apical file and show tug-back; then consider what to do when it goes too short or too long.

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