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Evaluation of dynamic and static torsional resistances of nickel-titanium rotary instruments
- Source :
- Journal of Dental Sciences, Vol 13, Iss 3, Pp 207-212 (2018), Journal of Dental Sciences
- Publication Year :
- 2018
- Publisher :
- Elsevier, 2018.
-
Abstract
- Background/purpose: This study evaluated the torsional resistances of nickel-titanium rotary instruments by two methods: i) dynamic resistance: repetitive torsional loading (RTL) and ii) static resistance: single torsional loading (STL) based on the International Organization for Standardization. Materials and methods: In RTL method, a pre-set rotational loading (0.5 N cm) was applied after fixing the 3-mm tip of the file, and this clockwise loading to the pre-set torque and counter-clockwise unloading to original position was repeated at 50 rpm until the file fractured. The number of repetition cycles until fracture was counted. In STL method, the torsional strength was determined by continuous clockwise rotation (2 rpm) until fracture. Results from both methods were compared after testing the torsional resistances of four instrument systems (n = 15): Hyflex CM, HyFlex EDM, V-Taper2, and V-Taper2H. A scanning electron microscope (SEM) was used to examine the topographic features of the fractured surfaces and longitudinal aspects (n = 5) from both methods. Results: The RTL and STL methods had similar results: V-Taper2 had the highest resistance and the Hyflex CM had the lowest (P
- Subjects :
- Yield (engineering)
Materials science
Scanning electron microscope
02 engineering and technology
Dynamic resistance
Torsional resistance
03 medical and health sciences
0302 clinical medicine
Torque
Nickel-titanium rotary instrument
General Dentistry
business.industry
Torsional strength
030206 dentistry
Structural engineering
021001 nanoscience & nanotechnology
lcsh:RK1-715
Fracture
Nickel titanium
Static rotation
lcsh:Dentistry
Fracture (geology)
Dynamic repetitive load
Original Article
0210 nano-technology
business
Subjects
Details
- Language :
- English
- ISSN :
- 19917902
- Volume :
- 13
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- Journal of Dental Sciences
- Accession number :
- edsair.doi.dedup.....0fb782fd33c8123d468a03ab3ab9669b