Comparison of Cyclic Fatigue Resistance of 5 Heat-treated Nickel-titanium Reciprocating Systems in Canals with Single and Double Curvatures
| Autor: | Khalid Merdad, Mohammad AlFaraj, Mohammed S. Alanazi, Ebtissam M. Al-Madi, Ali A. Alkhamis, Mohammad I. Al-Obaida, Hesham Altwaijry |
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| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Dental Instruments Cyclic stress Hot Temperature Materials science Curvature Radius of curvature (optics) 03 medical and health sciences Reciprocating motion 0302 clinical medicine Nickel Germany Materials Testing Composite material General Dentistry Titanium Equipment Design 030206 dentistry Radius 030104 developmental biology Nickel titanium Fracture (geology) Heat treated Equipment Failure Stress Mechanical Root Canal Preparation |
| Zdroj: | Journal of Endodontics. 45:1237-1241 |
| ISSN: | 0099-2399 |
| DOI: | 10.1016/j.joen.2019.06.011 |
| Popis: | The goal of this study was to compare the cyclic fatigue resistance of 5 heat-treated nickel-titanium files in reciprocating movement with the same tip size and different cross sections.Five groups (WaveOne [Dentsply, Ballaigues, Switzerland], WaveOne GOLD [Dentsply], RECIPROC [VDW, Munich, Germany], RECIPROC BLUE [VDW GmbH, Munich, Germany], and TF [Sybron Endo, Glendora, CA] Adaptive) of 24 files each of the rotary files were examined. Cyclic fatigue resistance was compared between groups by determining the time needed to fracture and the number of cycles to failure in a cyclic fatigue testing device with 2 different curvatures, the first with a 5-mm radius of curvature and a 60° angle and the second with a double curvature, coronal curvature of 60° angle and a radius of 5 mm, and an apical curvature of 70° angle and a 2-mm radius. Scanning electron microscopic evaluation was performed at the fracture sites to investigate the types of fracture.RECIPROC BLUE group had a higher mean time to fracture followed by RECIPROC and WaveOne GOLD for both single and double curvature. WaveOne had a higher mean time to fracture in a single curvature canal than TF Adaptive, whereas the opposite was true for a double curvature canal. Both RECIPROC groups were significantly greater in cyclic fatigue resistance in comparison with all other groups (P.05). WaveOne GOLD was significantly greater than the WaveOne and TF Adaptive groups (P.05).RECIPROC BLUE files exhibited significantly greater cyclic fatigue resistance compared with other files tested in an S-shaped artificial canal. |
| Databáze: | OpenAIRE |
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