Characterization of Next-Generation Nickel-Titanium Rotary Endodontic Instruments

William A. Brantley, Jie Liu, Scott R. Schricker, Fengyuan Zheng, John M. Nusstein, Masahiro Iijima, William A.T. Clark, Satish B. Alapati

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Background: Next-generation rotary endodontic instruments (GT® Series X™) with improved clinical performance have been fabricated from special superelastic NiTi wire with a nanoscale martensitic structure. Last year we reported Vickers hardness measurements and SEM images of as-received and clinically used GT® Series X™ instruments. In this manuscript, we report characterization of the nickel-titanium instruments, using Micro-X-ray diffraction and differential scanning calorimetry (DSC). Results: X-ray diffraction shows evidence of the martensitic structure that accounts for the much higher Vickers hardness and superior wear resistance of the next-generation NiTi instruments, compared to previous instruments. DSC analyses show that fabrication of these instruments from the starting special superelastic wire has little effect on NiTi transformations and that most of the NiTi microstructure does not undergo transformation during heating to 120°C. Conclusions: Micro-X-ray diffraction and DSC provide important characterization information for these instruments, but TEM is needed for detailed insight the complex martensitic structure.

Original languageEnglish (US)
Title of host publicationBiomaterials Science
Subtitle of host publicationProcessing, Properties and Applications III
PublisherWiley
Pages11-18
Number of pages8
Volume242
ISBN (Electronic)9781118751015
ISBN (Print)9781118751039
DOIs
StatePublished - Aug 23 2013
Externally publishedYes
EventNext Generation Biomaterials and Surface Properties of Biomaterials Symposia - Materials Science and Technology 2012 Conference, MS and T 2012 - Pittsburgh, PA, United States
Duration: Oct 27 2012Oct 31 2012

Publication series

NameCeramic Transactions
Volume242
ISSN (Print)1042-1122

Conference

ConferenceNext Generation Biomaterials and Surface Properties of Biomaterials Symposia - Materials Science and Technology 2012 Conference, MS and T 2012
Country/TerritoryUnited States
CityPittsburgh, PA
Period10/27/1210/31/12

Bibliographical note

Publisher Copyright:
© 2013 The American Ceramic Society. All rights reserved.

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