Basic ResearchBending Properties of a New Nickel-Titanium Alloy with a Lower Percent by Weight of Nickel
Section snippets
Materials and Methods
Ten instruments with tip size 25 and 0.06 taper of each of the following NiTi rotary instrumentation techniques were selected for the study: (1) Hyflex (Coltene-Whaledent, Allstetten, Switzerland), (2) EndoSequence (Brasseler, Savannah, GA), (3) ProFile (Dentsply-Maillefer, Baillagues, Switzerland), (4) Hero (MicroMega, Besancon, France), and (5) Flexmaster (VDW, Munchen, Germany).
All instruments from each group were tested for stiffness by comparing their bending moment when they attained a
Results
Mean values and standard deviation for each group of instruments are shown in Table 1. The higher the value, the more rigid were the instruments. Statistical analysis of the data revealed that Hyflex files were found to be the most flexible instruments, with a significant difference (P < .05) in comparison with the other instruments. Among the other files, a significant difference was found for EndoSequence instruments compared with ProFile, Hero, and FlexMaster (P < .05), whereas no
Discussion
Thermal treatment of NiTi alloys for endodontic use is a new field of research, and little information is currently available. Thermal treatment of the alloy is known to produce a better arrangement of the crystal structure, thus leading to improved flexibility (superelastic behavior), and also changes in the percentage of phases (a different grain structure) of the alloy, thus leading to improved resistance or plastic behavior. Patented, proprietary processes are highly influenced by
Acknowledgments
The authors deny any conflicts of interest related to this study.
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