Which of the following are true of the crown-down technique?
1. To enlarge the coronal 1/3 of the canal preparation.
2. To enlarge the apical 1/3 of the canal to properly fit the master cone of gutta percha.
3.To use a sequential series of instruments, starting with the smaller sizes and progressing toward the larger sizes, irrespective of the instruments series used.
4. To use a series of instruments whereby one begins with larger sizes and progresses towards the smaller sizes.
5. NiTi rotary-shaping files are best.
6. ISO hand files and GGs are best.
Answers:
1, 3, 5
1, 3, 6
2 and 5
3 and 6
4 and 5
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