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- Title
Influence of cyclic loading in NiTi austenitic and R-phase endodontic files from a finite element perspective.
- Authors
Martins, Suzanny C. S.; Silva, Jessica D.; Garcia, Paula R.; Viana, Ana C. D.; Buono, Vicente T. L.; Santos, Leandro A.
- Abstract
Objectives: This study aims to evaluate the effects of cyclic loading on the bending moments and the developed stress state of austenitic and R-phase endodontic files through finite element analysis. Materials and methods: The mechanical properties of two groups of NiTi wires, austenite and R-phase, were measured in samples at two different conditions: uncycled and cycled. The cycled condition was achieved by subjecting samples of the two groups to 80% of the corresponding fatigue life under rotating bending efforts. The measured mechanical properties were then used in the finite element analysis, where the boundary and loading conditions were set to replicate a standard bending test. Results: The results showed that mechanical cycling leads to decreasing stress levels and bending moments in the simulated files, especially in the austenitic ones. In comparison with austenite, R-phase presented a more stable mechanical behavior during cycling. Conclusions: The results show that the moment and stress calculated for an instrument under bending can be considerably decreased after some cyclic work. Clinical relevance: The fatigue related to the clinical use of an endodontic file decreases the moment (as well as the forces) imposed by the instrument during the shaping of a curved root canal. This decrease is directly related to the type of atomic array present in the alloy.
- Subjects
CYCLIC loads; MECHANICAL behavior of materials; NICKEL-titanium alloys; BENDING stresses; BENDING moment
- Publication
Clinical Oral Investigations, 2022, Vol 26, Issue 5, p3939
- ISSN
1432-6981
- Publication type
Article
- DOI
10.1007/s00784-021-04360-2