Restor Dent Endod.  2017 Nov;42(4):282-289. 10.5395/rde.2017.42.4.282.

In vitro comparison of the cyclic fatigue resistance of HyFlex EDM, One G, and ProGlider nickel titanium glide path instruments in single and double curvature canals

Affiliations
  • 1Çorum Oral and Dental Health Center, Çorum, Turkey.
  • 2Department of Endodontics, Ondokuz Mayıs University Faculty of Dentistry, Samsun, Turkey. tahaozyurek@hotmail.com

Abstract


OBJECTIVES
It was aimed to compare the cyclic fatigue resistances of ProGlider (PG), One G (OG), and HyFlex EDM (HEDM) nickel titanium glide path files in single- and double-curved artificial canals.
MATERIALS AND METHODS
40 PG (16/0.02), 40 OG (14/0.03), and 40 HEDM (10/0.05) single-file glide path files were used in the present study. Sixty files were subjected to cyclic fatigue test by using double-curved canals and 60 files by using single-curved canal (n = 20). The number of cycles to fracture (NCF) was calculated and the length of the fractured fragment (FL) was determined by a digital micro-caliper. Twelve pieces of fractured files were examined with scanning electron microscope to determine fracture types of the files (n = 2). The NCF and the FL data were analyzed using one-way analysis of variance and post hoc Tukey test using SPSS 21 software (p < 0.05).
RESULTS
In all of the groups, NCF values were significantly lower in double-curved canals when compared to single-curved canals (p < 0.05). For both of single- and double-curved canals, NCF values of HEDM group in apical and coronal curvatures were found to be significantly higher than NCF values of PG and OG groups (p < 0.05). In both of single- and double-curved canals, NCF value of PG group was found significantly higher than OG group (p < 0.05).
CONCLUSIONS
Within the limitations of this study, HEDM glide path files were found to have the highest cyclic fatigue resistance in both of single- and double-curved canals.

Keyword

Cyclic fatigue; Double curvature; HyFlex EDM; One G; ProGlider

MeSH Terms

Fatigue*
In Vitro Techniques*
Nickel*
Titanium*
Nickel
Titanium

Figure

  • Figure 1 Artificial canal with double curvature that used in the present study.

  • Figure 2 Artificial canal with single curvature that used in the present study.

  • Figure 3 Scanning electron microscopic appearances of the One G (OG), ProGlider (PG), and HyFlex EDM (HEDM) files after cyclic fatigue testing. View of the fractured surface (A) HEDM, (C) OG, and (E) PG and high-magnification view of (B) HEDM, (D) OG, and (F) PG instruments showing fatigue striations typical of cyclic fatigue (arrows). One G, Micro-Mega, Besancon, France; ProGlider, Dentsply Maillefer, Ballaigues, Switzerland; HyFlex EDM, Coltene/Whaledent AG, Altstätten, Switzerland.


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