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Volume 15
Issue 19
10.3390/ma15196568
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Article

Influence of NiTi Wire Diameter on Cyclic and Torsional Fatigue Resistance of Different Heat-Treated Endodontic Instruments

by
Eugenio Pedullà
1,
Francesco Saverio Canova
1,
Giusy Rita Maria La Rosa
1,*,
Alfred Naaman
2,
Franck Diemer
3,4,
Luigi Generali
5,† and
Walid Nehme
2,†
1
Department of General Surgery and Medical-Surgical Specialties, University of Catania, Via Santa Sofia, 78, 95123 Catania, Italy
2
Endodontic Department, Saint Joseph University of Beirut, Rue de Damas P.O. Box 17-5208, Beirut 1104 2020, Lebanon
3
Restorative and Endodontic Department, CHU de Toulouse, University of Toulouse, 31013 Toulouse, France
4
Clement Ader Institute, UMR CNRS 5312, 31400 Toulouse, France
5
Endodontic Section, Department of Surgery, Medicine, Dentistry and Morphological Sciences with Transplant Surgery, Oncology and Regenerative Medicine Relevance (CHIMOMO), School of Dentistry, University of Modena and Reggio Emilia, 41125 Modena, Italy
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Materials 2022, 15(19), 6568; https://doi.org/10.3390/ma15196568
Submission received: 30 August 2022 / Revised: 14 September 2022 / Accepted: 19 September 2022 / Published: 22 September 2022
(This article belongs to the Special Issue Advanced Materials and Technologies in Endodontics and Restorative Dentistry)
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Abstract

We compared the mechanical properties of 2Shape mini TS2 (Micro-Mega, Besançon, France) obtained from 1.0 diameter nickel-titanium (NiTi) wires and 2Shape TS2 from 1.2 diameter nickel-titanium (NiTi) wires differently thermally treated at room and body temperature. We used 120 NiTi TS2 1.0 and TS2 1.2 files made from controlled memory (CM) wire and T-wire (n = 10). Cyclic fatigue resistance was tested by recording the number of cycles to fracture (NCF) at room and body temperatures using a customized testing device. Maximum torque and angle of rotation at failure were recorded, according to ISO 3630-1. Data were analyzed by a two-way ANOVA (p < 0.05). The CM-wire files had significantly higher NCFs at both temperatures, independent of wire dimensions. Testing at body temperature negatively affected cyclic fatigue of all files. The 1.0-mm diameter T-wire instruments showed higher NCF than the 1.2-mm diameter, whereas no significant differences emerged between the two CM wires at either temperature. The maximum torque was not significantly different across files. The TS2 CM-wire files showed significantly higher angular rotation to fracture than T-wire files. The TS2 CM-wire prototypes showed higher cyclic fatigue resistance than T-wire prototypes, regardless of wire size, exhibiting suitable torsional properties. Torsional behavior appears to not be affected by NiTi wire size.
Keywords: cyclic fatigue; endodontics; heat treatment; NiTi wire diameter; torsional fatigue; 2Shape cyclic fatigue; endodontics; heat treatment; NiTi wire diameter; torsional fatigue; 2Shape

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MDPI and ACS Style

Pedullà, E.; Canova, F.S.; La Rosa, G.R.M.; Naaman, A.; Diemer, F.; Generali, L.; Nehme, W. Influence of NiTi Wire Diameter on Cyclic and Torsional Fatigue Resistance of Different Heat-Treated Endodontic Instruments. Materials 2022, 15, 6568. https://doi.org/10.3390/ma15196568

AMA Style

Pedullà E, Canova FS, La Rosa GRM, Naaman A, Diemer F, Generali L, Nehme W. Influence of NiTi Wire Diameter on Cyclic and Torsional Fatigue Resistance of Different Heat-Treated Endodontic Instruments. Materials. 2022; 15(19):6568. https://doi.org/10.3390/ma15196568

Chicago/Turabian Style

Pedullà, Eugenio, Francesco Saverio Canova, Giusy Rita Maria La Rosa, Alfred Naaman, Franck Diemer, Luigi Generali, and Walid Nehme. 2022. "Influence of NiTi Wire Diameter on Cyclic and Torsional Fatigue Resistance of Different Heat-Treated Endodontic Instruments" Materials 15, no. 19: 6568. https://doi.org/10.3390/ma15196568

APA Style

Pedullà, E., Canova, F. S., La Rosa, G. R. M., Naaman, A., Diemer, F., Generali, L., & Nehme, W. (2022). Influence of NiTi Wire Diameter on Cyclic and Torsional Fatigue Resistance of Different Heat-Treated Endodontic Instruments. Materials, 15(19), 6568. https://doi.org/10.3390/ma15196568

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