Abstract
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 language | English |
---|---|
Title of host publication | Biomaterials Science |
Subtitle of host publication | Processing, Properties and Applications V: Ceramic Transactions, Volume 254 |
Publisher | wiley |
Pages | 47-54 |
Number of pages | 8 |
ISBN (Electronic) | 9781119190134 |
ISBN (Print) | 9781119190028 |
DOIs | |
Publication status | Published - 2015 Sep 4 |
Externally published | Yes |
Keywords
- Clinical performance
- Martensite phase
- Micro-x-ray diffraction
- Nickel
- Rotatory endodontic instrument
- titanium
ASJC Scopus subject areas
- Engineering(all)
- Materials Science(all)