Fracture resistances of heat-treated nickel-titanium files used for minimally invasive instrumentation
Abstract Background This study compared the torsional resistance, bending stiffness, and cyclic fatigue resistances of different heat-treated NiTi files for minimally invasive instrumentation. Methods TruNatomy (TN) and EndoRoad (ER) file systems were compared with ProTaper Gold (PG). Torsional load...
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BMC
2025-01-01
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| Series: | BMC Oral Health |
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| Online Access: | https://doi.org/10.1186/s12903-025-05487-4 |
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| author | Yoo Jung Kang Sang Won Kwak Jung-Hong Ha Gianluca Gambarini Hyeon-Cheol Kim |
| author_facet | Yoo Jung Kang Sang Won Kwak Jung-Hong Ha Gianluca Gambarini Hyeon-Cheol Kim |
| author_sort | Yoo Jung Kang |
| collection | DOAJ |
| description | Abstract Background This study compared the torsional resistance, bending stiffness, and cyclic fatigue resistances of different heat-treated NiTi files for minimally invasive instrumentation. Methods TruNatomy (TN) and EndoRoad (ER) file systems were compared with ProTaper Gold (PG). Torsional load, distortion angle, and bending stiffness were assessed using a custom device AEndoS, and toughness was calculated using the torsional data. Cyclic fatigue resistance was evaluated using another custom device (EndoC) with 45-degree curved canal in which file was rotated until fracture using dynamic pecking motion at 37 °C. One-way analysis of variance and Duncan’s post-hoc comparison were conducted at a significance level of 95%. Scanning electron microscopy (SEM) analyzed fracture features and differential scanning calorimetry (DSC) analyzed phase transformation temperatures. Results ER and TN showed significantly lower torsional strength than PG (p < 0.05). However, ER showed a significantly greater distortion angle and the highest toughness, followed by PG and TN (p < 0.05). Both ER and TN showed similar bending stiffness, which was lower bending stiffness than PG (p < 0.05). ER showed the highest cyclic fatigue resistance (p < 0.05). SEM revealed typical fracture features across all groups, with distinct milling grooves in PG and TN, not in ER. DSC indicated that PG and ER showed a peak of austenite (Ap) at temperatures higher than body temperature, 42 °C and 40 °C, respectively, while TN showed A p at 25 °C. Conclusion Files for minimally invasive instrumentations typically exhibited high cyclic fatigue resistance but showed differences in the properties. The selection should depend on the root canal and tooth condition. |
| format | Article |
| id | doaj-art-8c6a01d80441440986804734784ace87 |
| institution | Kabale University |
| issn | 1472-6831 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | BMC |
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| series | BMC Oral Health |
| spelling | doaj-art-8c6a01d80441440986804734784ace872025-01-26T12:55:01ZengBMCBMC Oral Health1472-68312025-01-0125111010.1186/s12903-025-05487-4Fracture resistances of heat-treated nickel-titanium files used for minimally invasive instrumentationYoo Jung Kang0Sang Won Kwak1Jung-Hong Ha2Gianluca Gambarini3Hyeon-Cheol Kim4Department of Conservative Dentistry, School of Dentistry, Dental Research Institute, Dental and Life Science Institute, Pusan National UniversityDepartment of Conservative Dentistry, School of Dentistry, Dental Research Institute, Dental and Life Science Institute, Pusan National UniversityDepartment of Conservative Dentistry, College of Dentistry, Kyungpook National UniversityDepartment of Oral and Maxillofacial Sciences, Sapienza University of RomeDepartment of Conservative Dentistry, School of Dentistry, Dental Research Institute, Dental and Life Science Institute, Pusan National UniversityAbstract Background This study compared the torsional resistance, bending stiffness, and cyclic fatigue resistances of different heat-treated NiTi files for minimally invasive instrumentation. Methods TruNatomy (TN) and EndoRoad (ER) file systems were compared with ProTaper Gold (PG). Torsional load, distortion angle, and bending stiffness were assessed using a custom device AEndoS, and toughness was calculated using the torsional data. Cyclic fatigue resistance was evaluated using another custom device (EndoC) with 45-degree curved canal in which file was rotated until fracture using dynamic pecking motion at 37 °C. One-way analysis of variance and Duncan’s post-hoc comparison were conducted at a significance level of 95%. Scanning electron microscopy (SEM) analyzed fracture features and differential scanning calorimetry (DSC) analyzed phase transformation temperatures. Results ER and TN showed significantly lower torsional strength than PG (p < 0.05). However, ER showed a significantly greater distortion angle and the highest toughness, followed by PG and TN (p < 0.05). Both ER and TN showed similar bending stiffness, which was lower bending stiffness than PG (p < 0.05). ER showed the highest cyclic fatigue resistance (p < 0.05). SEM revealed typical fracture features across all groups, with distinct milling grooves in PG and TN, not in ER. DSC indicated that PG and ER showed a peak of austenite (Ap) at temperatures higher than body temperature, 42 °C and 40 °C, respectively, while TN showed A p at 25 °C. Conclusion Files for minimally invasive instrumentations typically exhibited high cyclic fatigue resistance but showed differences in the properties. The selection should depend on the root canal and tooth condition.https://doi.org/10.1186/s12903-025-05487-4Bending stiffnessHeat treatmentMinimal invasiveTorsional resistanceCyclic fatigue |
| spellingShingle | Yoo Jung Kang Sang Won Kwak Jung-Hong Ha Gianluca Gambarini Hyeon-Cheol Kim Fracture resistances of heat-treated nickel-titanium files used for minimally invasive instrumentation BMC Oral Health Bending stiffness Heat treatment Minimal invasive Torsional resistance Cyclic fatigue |
| title | Fracture resistances of heat-treated nickel-titanium files used for minimally invasive instrumentation |
| title_full | Fracture resistances of heat-treated nickel-titanium files used for minimally invasive instrumentation |
| title_fullStr | Fracture resistances of heat-treated nickel-titanium files used for minimally invasive instrumentation |
| title_full_unstemmed | Fracture resistances of heat-treated nickel-titanium files used for minimally invasive instrumentation |
| title_short | Fracture resistances of heat-treated nickel-titanium files used for minimally invasive instrumentation |
| title_sort | fracture resistances of heat treated nickel titanium files used for minimally invasive instrumentation |
| topic | Bending stiffness Heat treatment Minimal invasive Torsional resistance Cyclic fatigue |
| url | https://doi.org/10.1186/s12903-025-05487-4 |
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