Cleaning and Shaping Review

Lecture given 8/25/2025, again this lecture has a lot of repeating info so I picked out the important points

a number 10 file has a taper of 0.2, what is the D0 and D16?

D0 is 0.10 mm

D16 is 0.42 mm

a number 15 file has a taper of 0.2, what is the D0 and D16?

D0 is 0.15 mm

D16 is 0.47 mm

what are the beneficial features of rotary instruments?

made of nickel titanium which is a flexible material that is able to follow mild curves

fluets lift debris coronally

tapered shafts reduce the number or instruments needed

what is the difference in taper between S files and F files?

S files have a more drastic taper toward the top of the file, so it cuts the coronal portion

F files have a more drastic taper toward the bottom of the file, so it cuts more at the apical portion

what is the furcation danger zone?

it is the zone on the mesial portion of the root canal, it is usually much thinner than the distal portion of the root canal

not being aware of the danger zone can lead to strip perforation

rotary should only be taken where…

you have a glide path

if you can take a #35 to working length, list the length and file size of each following file before a cone fit can be performed

1 mm back from working length- #40

2 mm back from working length- #45

3 mm back from working length- #50

4 mm back from working length- #55

5 mm back from working length- #60