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

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

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...

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Bibliographic Details
Published in:Materials 2022-09, Vol.15 (19), p.6568
Main Authors: Pedullà, Eugenio, Canova, Francesco Saverio, La Rosa, Giusy Rita Maria, Naaman, Alfred, Diemer, Franck, Generali, Luigi, Nehme, Walid
Format: Article
Language:eng
Subjects:
2Shape
Body temperature
Comparative analysis
Crack initiation
cyclic fatigue
Endodontics
Failure analysis
Fatigue strength
Fatigue tests
Heat
Heat treatment
Intermetallic compounds
Mechanical properties
Nickel products
Nickel titanides
NiTi wire diameter
Prototypes
Rotation
Scanning electron microscopy
Statistical analysis
Testing equipment
Thermal cycling
Titanium
Torque
Torsional fatigue
Wire
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Summary: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.
ISSN:1996-1944
1996-1944