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Influence of different heat treatments and temperatures on the cyclic fatigue resistance of endodontic instruments with the same design

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Abstract

Objectives

To evaluate the influence of different heat treatments and temperatures on the cyclic fatigue resistance of 2Shape instruments (Micro Mega, Besancon, France) with the same design.

Materials and methods

A total of 80 2Shape TS1 (#25/.04) and 80 TS2 (#25/.06) files with different heat treatments (no heat-treated, NHT; C-Wire; T-Wire; CM-Wire) were tested at room (25° ± 1 °C) and body (37° ± 1 °C) temperatures in 16-mm stainless steel artificial canal with a curvature of 60° and 5 mm of radius. Files were tested in continuous rotation at 300 rpm using a customized device. Cyclic fatigue resistance was expressed in the number of cyclic to fracture (NCF). The phase transformation temperature of each file was determined by differential scanning calorimetry. Data were statistically analyzed using the two-way ANOVA and the Bonferroni post-hoc test with p < 0.05.

Results

All CM-Wire TS1 and TS2 files showed higher NCF than the other groups at both temperatures (p < 0.001). C-Wire TS2 showed higher resistance than NHT and T-Wire TS2 (p < 0.001), with no significant differences between the last two. Body temperature significantly decreased NCF of all tested files (p < 0.05) except for NHT and T-Wire TS1.

Conclusions

Body temperature negatively affected the cyclic fatigue resistance of C-Wire and CM-Wire TS1 and of all TS2 files compared with room temperature. The CM-Wire instruments exhibited the highest cyclic fatigue resistance of all tested files.

Clinical relevance

Heat-treated nickel-titanium files can differently perform according to environmental temperature and file dimensions. The CM-Wire 2Shape prototypes displayed the highest flexural resistance in all experimental conditions.

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Author information

Authors and Affiliations

  1. Endodontic Department, Saint Joseph University of Beirut, Rue de Damas, B.P. 17-5208, Beirut, 1104 2020, Lebanon

    Walid Nehme & Alfred Naaman

  2. UFR d’Odontologie Et CHU de Toulouse, 2 Rue Charles Viguerie, 31300, Toulouse, France

    Franck Diemer

  3. Institut Clément Ader, UMR-CNRS 5312, 3, Rue Caroline Aigle, 31400, Toulouse, Toulouse, France

    Franck Diemer

  4. Department of General Surgery and Medical-Surgical Specialties, University of Catania, Via Santa Sofia, 78, 95123, Catania, Italy

    Maria Laura Leotta, Giusy Rita Maria La Rosa & Eugenio Pedullà

Authors
  1. Walid Nehme
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  2. Alfred Naaman
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  3. Franck Diemer
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  4. Maria Laura Leotta
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  5. Giusy Rita Maria La Rosa
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  6. Eugenio Pedullà
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Contributions

Conceptualization: EP and WN. Data curation: MLL, GRMLR, and AN. Formal analysis: EP, WN, and AN. Investigation: AN and FD. Methodology: EP, MLL, and GRMLR. Project administration: EP, WN, and AN. Resources: EP and WN. Software: AN and FD. Supervision: WN. Validation: GRMLR and FD. Visualization: MLL. Roles/writing—original draft: GRMLR, MLL, and AN. Writing—review and editing: EP, WN, and FD. All authors have read and approved the manuscript.

Corresponding author

Correspondence to Giusy Rita Maria La Rosa.

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The authors declare that they have no conflict of interest.

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Nehme, W., Naaman, A., Diemer, F. et al. Influence of different heat treatments and temperatures on the cyclic fatigue resistance of endodontic instruments with the same design. Clin Oral Invest 27, 1793–1798 (2023). https://doi.org/10.1007/s00784-022-04808-z

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  • DOI: https://doi.org/10.1007/s00784-022-04808-z

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