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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