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Wednesday, June 21, 2000

Conservative and Endodontics MCQ Answer 3

Wednesday, June 21, 2000

Correct Answer is e. 4 and 5

The Crown-down manner is one technique of coronal two-thirds preenlargement of a canal, involving the serial use of instruments, starting with the larger sizes and progressing toward the smaller sizes. The other type is called Step-back. Step back involves sequentially using instruments, starting with the smaller sizes and progressing toward the larger sizes, regardless of the instrument series.

1 and 2 are both wrong because the technique involves two-thirds preenlargement of the coronal canal preparation

3. is wrong because this describes the Step-back technique

4. is one of the correct responses as noted in the above

5. is correct; this is the virtual consensus on the preferred instrument type for crown-down

6. is incorrect; ISO hand files and GGs are best used in a step-back technique

Taken from:

Cohen S, Burns RC. Pathways of the Pulp. 8th Ed. (2002). CV Mosby, St. Louis, MO.

Pp 265-266.


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