S-Space College of Dentistry/School of Dentistry (치과대학/치의학대학원) Dept. of Dentistry (치의학과) Journal Papers (저널논문_치의학과)
A comparison of nickel-titanium rotary instruments manufactured using different methods and cross-sectional areas: ability to resist cyclic fatigue
- Issue Date
- Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2010;109:622-628
- Objective. This study examined the effect of the manufacturing methods (ground, electropolished, and twisted) and
the cross-sectional area (CSA) of nickel-titanium (NiTi) rotary instruments on their cyclic fatigue resistance.
Study design. A total of 80 NiTi rotary instruments (ISO 25/.06 taper) from 4 brands (K3, ProFile, RaCe, and TF) were
rotated in a simulated root canal with pecking motion until fracture. The number of cycles to failure (NCF) was
calculated. The CSA at 3 mm from the tip of new instruments of each brand was calculated. The correlation between
the CSA and NCF was evaluated. All fractured surfaces were analyzed using a scanning electron microscope to
determine the fracture mode.
Results. The TF instruments were the most resistant to fatigue failure. The resistance to cyclic failure increased with
decreasing CSA. All fractured surfaces showed the coexistence of ductile and brittle properties.
Conclusion. The CSA had a significant effect on the fatigue resistance of NiTi rotary instruments.
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