Basic ResearchEvaluation of the Resistance to Cyclic Fatigue among ProTaper Next, ProTaper Universal, and Vortex Blue Rotary Instruments
Section snippets
Materials and Methods
PTN consists of a series of 5 instruments called X1, X2, X3, X4, and X5. PTU exists as a series of instruments that are denoted as SX, S1, S2 F1, F2, F3, F4, and F5. The SX instrument was not examined in this study. VB instruments are available in 0.04 and 0.06 tapers. A taper of 0.04 was examined in this study because the manufacturer recommended 0.04 taper instruments in moderate to severe curvatures when instrumenting past the midroot. The following tip sizes for VB were examined: 20, 25,
Results
The mean NCFs and standard deviations for PTN, PTU, and VB are presented in Table 1. One-way analysis of variance and Tukey post hoc tests showed that PTN X1 had significantly higher NCF than PTN X2–X5, PTU S1–F5, and VB 50/04. PTN X1 had significantly lower NCF than VB 20/04–30/04. PTN X2 had significantly higher NCF than PTN X3, PTN X5, and PTU F2–F5. PTN X2 had significantly lower NCF than PTU S1 and VB 20/04–45/04. PTN X3–X5 each had significantly lower NCF than PTU S1–F1 and VB
Discussion
This study is the first to compare cyclic fatigue resistance of PTN and VB using a well-established cyclic fatigue model (1). When comparing PTN and PTU, PTN X2 was significantly more fatigue resistant than PTU F2–F5, but PTN X3 and PTN X4 were not more fatigue resistant than PTU F2–F5. The cutting envelopes at the tips of PTN X2 and PTU F2 are 0.25 mm. If a clinician plans to finish apical instrumentation at a 0.25-mm size, then one may consider finishing with a PTN X2 if fracture resistance
Conclusions
Under the limitations of this study, specifically the fact that only one defined canal geometry was simulated, instruments from VB 20/04–30/04 were more resistant to cyclic fatigue than PTU S1–F5 and PTN X1–X5. VB 35/04–45/04 were more resistant to cyclic fatigue than PTU S2–F5 and PTN X2–X5. PTN X1 was more resistant to cyclic fatigue than PTU S1–F5. PTN X2 was more resistant to cyclic fatigue than PTU F2–F5. The Weibull distribution may be a feasible model to study NiTi rotary instrument
Acknowledgments
Dr Peters serves as a consultant to Dentsply Maillefer, Ballaigues, Switzerland.
The authors deny any conflicts of interest related to this study.
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