Evaluation of Cyclic Fatigue and Bending Resistance of Coronal Preflaring NiTi File Manufactured with Different Heat Treatments
Source abstract
Abstract
Coronal preflaring NiTi files should possess proper hardness, resistance to fracture and flexibility. This study compared the bending resistance and cyclic fatigue resistance of three orifice preflaring NiTi files. HyFlex EDM Orifice opener (#25/12), HyFlex CM (#25/08) and One Flare (#25/09) were tested (n = 46/instrument). Bending resistance was assessed with the stress when perpendicular displacement was applied to a 3 mm point from the file tip, and was performed at either room temperature (RT, n = 10) or body temperature (BT, n = 10). Cyclic fatigue resistance was tested with an artificial ceramic root canal at RT (n = 10) and BT (n = 10), and the number of cycles to failure (NCF) was obtained. The bending resistance and the NCF results were analyzed by two-way ANOVA and Tukey’s test. Differential scanning calorimetry (DSC) and X-ray diffraction (XRD) analyses were performed (n = 3, respectively). HyFlex EDM exhibited the highest bending resistance, followed by One Flare and HyFlex CM (p < 0.05), irrespective of the tested temperature. At RT, HyFlex CM demonstrated the highest NCF (p = 0.001), while HyFlex EDM had the highest NCF at BT (p < 0.001). The tested NiTi files were composed of austenite and martensite according to the DSC and XRD results. HyFlex EDM had the highest bending resistance and NCF measured at BT.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Endodontics and Root Canal Treatments · Dental materials and restorations · Occupational health in dentistry
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Conservative Dentistry, KyungHee University Dental Hospital, 23 Kyungheedaero, Dongdaemun-gu, Seoul 02447, Korea
Korea Research Institute of Chemical Technology, 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Korea
Private Practice, 140 Eleftheriou Venizelou Str., 17676 Kalithea, Greece
Department of General Surgery and Surgical-Medical Specialties, University of Catania, Via Cervignano, 29, 95129 Catania, SC, Italy
King Abdulaziz Hospital, Jeddah 22421, Saudi Arabia
Director of Dental Services, Ministry of Health, P.O. Box 109196, Jeddah 21351, Saudi Arabia
Department of Restorative and Dental Materials, Faculty of Dentistry, Taif University, Taif 26571, Saudi Arabia
Schulich School of Medicine & Dentistry, University of Western Ontario, 1151 Richmond Street, London, ON N6A3K7, Canada
Department of Conservative Dentistry, Dental Research Institute, Seoul National University Dental Hospital, Seoul National University School of Dentistry, 101 Daehak-ro, Jongro-gu, Seoul 03080, Korea
Departments of Endodontics, University of the Pacific School of Dentistry, San Francisco, CA 94103, USA
School of Dentistry, University of Queensland, Brisbane, QLD 4000, Australia
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