Page 49 - The Beauty and Sorrow in Endodontics-Chapter 3

poses a threat to isolation, the author will perform routine endodontic access and

only remove all restoration materials once obturation is completed and the tooth is

ready for a buildup.
7 For more information on the determination of ideal taper, see “Working Lengths”

and “Cleaning and Shaping”. The properties of NiTi allows for a wider range of
taper design compared to the traditional stainless-steel files (always 0.02 taper).

Therefore, once cleaning and shaping is completed utilizing the envelope of

motion, a NiTi hand file with the targeted taper should be selected and placed into
the canal to confirm that the canal has been shaped to the proposed taper. Greater

#
Taper NiTi Hand Files all have a tip diameter of ISO 20, with a selection of four
different tapers: 0.06, 0.08, 0.10, and 0.12. ProTaper NiTi Finishing Hand Files, on

the other hand, have the following tip diameters and tapers respectively: F1 ( 20,
#
#
#
0.07), F2 ( 25, 0.08), F3 ( 30, 0.09).
8 The only benefit of retrieving the broken file is to have a nicer looking radiograph

for the operator’s ego, however, the process would involve removing more of the
dentinal structure that would weaken the root and put it at higher risk of root

fracture in the long run.

47