|
|
FINISHING INSTRUMENTS |
 |
|
Three finishing files, termed F1, F2 and F3, have yellow, red and blue identification rings on their handles corresponding to D0 diameters of 0.20, 0.25 and 0.30 mm, respectively. Between D0-D3, the F1, F2 and F3 have fixed tapers of 7%, 8% and 9%, respectively. From D4-D14 each instrument has increasing cross-sectional dimensions but over this same length, each instrument has a decreasing percentage tapers which serves to improve flexibility and reduce the potential for dangerous taper-lock. In conjunction with the use of the S1 and S2 files, the finishers progressively blend and expand the deep shape and create the tapered resistance form to hold gutta percha. Generally, only one finishing instrument is required to prepare the apical one-third of a canal.
|
|
|
|
|
