Cyclic fatigue resistance and fractographic analysis of RaCe and ProTaper rotary NiTi instruments
| Autor: | Shahram Azimi, Parisa Delvari, Hamid Cyrus Hajarian, Mohammad Ali Saghiri, Kasra Karamifar, Mehrdad Lotfi |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Iranian Endodontic Journal, Vol 6, Iss 2, Pp 80-85 (2011) |
| Druh dokumentu: | article |
| ISSN: | 1735-7497 2008-2746 |
| Popis: | INTRODUCTION: This study investigated the fatigue and fracture modes of RaCe and ProTaper rotary instruments. MATERIALS & METHODS: Fatigue resistance was evaluated by rotating the files 30° or 60°and with 2 or 5mm radius of curvature. RaCe taper 06 size 25 and ProTaper F1 files (n=40) were used. The number of rotations to failure was analyzed by two-way ANOVA and independent sample t-test. Fracture surfaces were examined under a scanning electron microscope. RESULTS: Both files exhibited significantly more resistance to fracture when angle severity was reduced and increase in curvature radius (P=0.000). ProTaper demonstrated higher number of cycle of failure (P=0.0029) in one group (r=5mm, 60º). SEM observation revealed fatigue mark/features in 17 specimens, shear characteristics in 37 samples, and tensile overload in 26 samples. CONCLUSION: Radius of curvature was the main factor in torsional and fatigue failures. |
| Databáze: | Directory of Open Access Journals |
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