IADR Abstract Archives
Electrochemical Properties of Nickel-Titanium Endodontic Files in EDTA
Objectives: In the past decade, manufacturers have modified steps in the processing of nickel-titanium (NiTi) endodontic files to introduce files with different properties. These files are exposed to different irrigating solutions during instrumentation that may result in accelerated attack or pitting in the files, thereby affecting their cyclic fatigue resistance.
To evaluate the electrochemical properties of a variety of commercially-available NiTi endodontic files in EDTA solution.
Methods: Eight brands of endodontic files were tested: Twisted and K3 (SybronEndo), GT Series X, Blue, and ProFile ISO (Dentsply Tulsa Dental), HyFlex CM (Coltene), Endosequence (Brasseler), and CM Wire (D&S Dental) (n=10/brand). All files were size 40 with a 0.04 taper. The 12 mm closest to the tip was isolated with lacquer and subjected to electrochemical testing in 17% EDTA at 35-37oC. The Open Circuit Potential (OCP) was observed for 60 minutes, followed by a cyclic polarization test from -300 to 700 mV (versus OCP) at a scan rate of 1 mV/s. OCP and Icorr were compared using non-parametric ANOVA and pairwise comparisons (p<0.05).
Results: The table displays the electrochemical results (mean±standard deviation).
Different letters for a given parameter indicate a statistically significant difference exists (p<0.05). Although not always significantly different, the non-ground file (Twisted) exhibited the lowest mean corrosion rate whereas OCP showed a wide variation among the files.
Conclusions: Differences in electrochemical properties are evident in nickel-titanium endodontic files. Heat treatment and/or other manufacturing procedures involved may be responsible for altering the electrochemical properties of the files.
To evaluate the electrochemical properties of a variety of commercially-available NiTi endodontic files in EDTA solution.
Methods: Eight brands of endodontic files were tested: Twisted and K3 (SybronEndo), GT Series X, Blue, and ProFile ISO (Dentsply Tulsa Dental), HyFlex CM (Coltene), Endosequence (Brasseler), and CM Wire (D&S Dental) (n=10/brand). All files were size 40 with a 0.04 taper. The 12 mm closest to the tip was isolated with lacquer and subjected to electrochemical testing in 17% EDTA at 35-37oC. The Open Circuit Potential (OCP) was observed for 60 minutes, followed by a cyclic polarization test from -300 to 700 mV (versus OCP) at a scan rate of 1 mV/s. OCP and Icorr were compared using non-parametric ANOVA and pairwise comparisons (p<0.05).
Results: The table displays the electrochemical results (mean±standard deviation).
Different letters for a given parameter indicate a statistically significant difference exists (p<0.05). Although not always significantly different, the non-ground file (Twisted) exhibited the lowest mean corrosion rate whereas OCP showed a wide variation among the files.
Conclusions: Differences in electrochemical properties are evident in nickel-titanium endodontic files. Heat treatment and/or other manufacturing procedures involved may be responsible for altering the electrochemical properties of the files.
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