Premium
Electrochemical dissolution of fractured nickel–titanium instruments in human extracted teeth
Author(s) -
Kowalczuck A.,
Silva Neto U. X.,
Fariniuk L. F.,
Westphalen V. P. D.,
Laurindo C. A. H.,
Carneiro E.
Publication year - 2017
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/iej.12654
Subject(s) - dissolution , electrochemistry , dentistry , sodium , materials science , nickel titanium , chemistry , nuclear chemistry , metallurgy , medicine , electrode , shape memory alloy
Aim To assess the effect of sodium chloride concentration in fluoridated solutions during the electrochemical dissolution of fractured rotary endodontic instruments. Methodology Two solutions were assessed (solution 1: NaF 12 g L −1 + NaCl 1 g L −1 , pH = 5.0; and solution 2: NaF 12 g L −1 + NaCl 180 g L −1 , pH = 5.0) using two tests: the ProTaper Universal F1 ( PTU F1) instrument polarization test and the polarization test for intracanal PTU F1 fragments fractured in mandibular incisors. In the first test, two sets of five instruments were separately and partially immersed in each solution, and the electrical current was evaluated over 30 min. In the second test, 45 PTU F1 instruments were fractured within the root canals of mandibular incisors and subjected to potentiodynamic polarization for 30 min. The electrical current and the variations in the length of PTU F1 fragments were measured. The data were analysed statistically ( anova and Wilcoxon and Mann–Whitney tests, respectively). Results Solution 2 was associated with more corrosive effects in both tests. In the first test, the PTU F1 instruments immersed in solution 2 had a higher electrical current ( P < 0.001) and had a total dissolution time of approximately 540 s. In the second test, a larger difference between the baseline and final lengths of the fragments was noted in solution 2 ( P = 0.011). Conclusion Saturation of fluoridated solution with sodium chloride led to an increase in electrical current and microscopic reductions in the length of fractured instrument fragments subjected to electrochemical dissolution.