Basic ResearchEvaluation of the Impact of Raw Materials on the Fatigue and Mechanical Properties of ProFile Vortex Rotary Instruments
Section snippets
Materials and Methods
Instruments with identical geometric design and different raw materials were used to minimize or negate the potential influences that specific file designs might have on the outcomes of this study. On the basis of the design of ProFile Vortex instrument 25/.06 (tip size 25, taper 0.06, 25 mm in length), 4 different raw materials were selected, including 302 stainless steel (S-S), conventional superelastic NiTi (SE-wire), M-Wire NiTi (M-Wire), and prototype Vortex Blue NiTi (Blue).
Results
The means and standard deviations of test results on fatigue life, peak torque, angle of rotation, flexibility, and Vickers microhardness are shown in Table 1.
Discussion
File design such as size/taper, cross-sectional geometry, and pitch/helical angle has a great influence on file properties; therefore, instruments with identical geometric design but different raw materials were used to eliminate this influence in the present study. Significant variations exist in the raw materials used in the fabrication of endodontic instruments; therefore, it is important for clinicians to understand the differences and the properties of these materials to take advantage of
Conclusion
Under the limitations of this study, NiTi shape memory alloy appeared to be a superior material option compared with stainless steel for its use in the manufacturing and application of endodontic rotary instruments. Vortex Blue NiTi and M-Wire offered functional advantages over conventional superelastic NiTi. Vortex Blue showed improved fatigue resistance and flexibility compared with ProFile Vortex M-Wire.
Acknowledgments
The authors thank Marcie Littleton and Chris Miller from Dentsply Tulsa Dental Specialties for their support in instrument preparation and testing.
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Supported by Dentsply Tulsa Dental Specialties.
Yong Gao, Kevin Wilkinson, Randall Maxwell, and Dan Ammon are affiliated with Dentsply Tulsa Dental Specialties. James L. Gutmann is professor emeritus of Baylor College of Dentistry at Texas A&M Health Science Center and is currently a consultant with Dentsply Tulsa Dental Specialties.