Micro-X-Ray Diffraction Study of New Nickel-Titanium Rotary Endodontic Instruments

William A. Brantley, Masahiro Iijima, William A.T. Clark, Scott R. Schricker, John M. Nusstein, Itaru Mizoguchi

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review


Background: Next-generation rotary endodontic instruments with improved clinical performance are being fabricated from special superelastic NiTi wires. We are reporting the initial metallurgical study of two recently introduced rotary instruments, HyFlex® CM™ (Coltène Whaledent) and Vortex Blue® (Dentsply Tulsa Dental Specialties), using Micro-X-ray diffraction. A wide range of sizes and tapers was examined, and analyses were performed at five sites on each instrument. Results: Similar x-ray diffraction patterns were observed for both instruments, and no dependence on size and taper was found. The lowest-intensity peaks occurred for the tip region. Four austenite peaks and one martensite peak were evident, along with a lowerangle peak that matched anatase titanium oxide. Preferred orientation existed for both austenite and martensite. Conclusions: Instruments were manufactured by similar proprietary processes. Future metallographic, SEM and TEM observations are needed to characterize instrument microstructures fully, since x-ray diffraction peak intensities are considerably diminished for the work-hardened martensite phase.

Original languageEnglish
Title of host publicationBiomaterials Science
Subtitle of host publicationProcessing, Properties and Applications V: Ceramic Transactions, Volume 254
Number of pages8
ISBN (Electronic)9781119190134
ISBN (Print)9781119190028
Publication statusPublished - 2015 Sept 4


  • Clinical performance
  • Martensite phase
  • Micro-x-ray diffraction
  • Nickel
  • Rotatory endodontic instrument
  • titanium


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