Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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Effect of surface treatment on the mechanical properties of nickel-titanium files with a similar cross-section

  • Kwak, Sang Won (Department of Conservative Dentistry, Pusan National University School of Dentistry and Dental Research Institute) ;
  • Lee, Joo Yeong (Department of Conservative Dentistry, Pusan National University School of Dentistry and Dental Research Institute) ;
  • Goo, Hye-Jin (Department of Conservative Dentistry, Pusan National University School of Dentistry and Dental Research Institute) ;
  • Kim, Hyeon-Cheol (Department of Conservative Dentistry, Pusan National University School of Dentistry and Dental Research Institute)
  • Received : 2017.03.21
  • Accepted : 2017.03.27
  • Published : 2017.08.31
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Abstract

Objectives: The aim of this study was to compare the mechanical properties of various nickel-titanium (NiTi) files with similar tapers and cross-sectional areas depending on whether they were surface-treated. Materials and Methods: Three NiTi file systems with a similar convex triangular cross-section and the same ISO #25 tip size were selected for this study: G6 (G6), ProTaper Universal (PTU), and Dia-PT (DPT). To test torsional resistance, 5 mm of the straightened file's tip was fixed between polycarbonate blocks (n = 15/group) and continuous clockwise rotation until fracture was conducted using a customized device. To evaluate cyclic fatigue resistance, files were rotated in an artificial curved canal until fracture in a dynamic mode (n = 15/group). The torsional data were analyzed using 1-way analysis of variance and the Tukey post-hoc comparison test, while the cyclic fatigue data were analyzed using the Mann-Whitney U test at a significance level of 95%. Results: PTU showed significantly greater toughness, followed by DPT and G6 (p < 0.05). G6 showed the lowest resistance in ultimate torsional strength, while it showed a higher fracture angle than the other files (p < 0.05). In the cyclic fatigue test, DPT showed a significantly higher number of cycles to failure than PTU or G6 (p < 0.05). Conclusions: Within the limitations of this study, it can be concluded that the torsional resistance of NiTi files was affected by the cross-sectional area, while the cyclic fatigue resistance of NiTi files was influenced by the surface treatment.

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References

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