Question 568 · LDEK · Access and canal preparation
Secondary access opening for endodontic retreatment allows for:
1) removal of roof overhangs and pulp stones from the chamber;
2) determining the location of root canal orifices;
3) in the case of premolars, removal of the lingual shoulder of the chamber;
4) reducing the risk of perforation as a result of overinstrumentation;
5) preparation of canal orifices including parts located on the chamber floor;
6) establishing convenient access to the middle and apical portion of the canal.
The correct answer is:
2) determining the location of root canal orifices;
3) in the case of premolars, removal of the lingual shoulder of the chamber;
4) reducing the risk of perforation as a result of overinstrumentation;
5) preparation of canal orifices including parts located on the chamber floor;
6) establishing convenient access to the middle and apical portion of the canal.
The correct answer is:
- A. 1,2,4.
- B. 1,3,5.
- C. 3,4,5.
- D. 4,5,6.
- E. 2,4,6.
Hint
Separate what is done while opening the pulp chamber from what is done afterwards at the canal orifices to gain straight-line access.
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