Question 191 · LDEK · Access and canal preparation
In which situations the determination of the working length by means of contemporary electronic apex locators may give false readings?
1) contact of the file to the metallic reconstructions;
2) presence of irrigating solution in the root canal;
3) presence of blood in the root canal;
4) tooth with an immature root.
The correct answer is:
2) presence of irrigating solution in the root canal;
3) presence of blood in the root canal;
4) tooth with an immature root.
The correct answer is:
- A. 1,2.
- B. 1,3.
- C. 2,3.
- D. 1,4.
- E. 2,4.
Hint
Modern ratio-based apex locators tolerate electrolytes in the canal; think about current leakage and a missing apical constriction.
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