Dynamic Cyclic Fatigue and Differential Scanning Calorimetry Analysis of R-Motion
ABSTRACT: Introduction: The aim of this study was to assess the dynamic cyclic fatigue resistance of an R-Motion file at simulated body temperature and document corresponding phase transformations compared to OneCurve and HyFlex EDM (HFEDM). Methods: R-Motion (25/.06), OneCurve (25/.06), and HFEDM...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-10-01
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| Series: | International Dental Journal |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0020653922002842 |
| _version_ | 1797686867084181504 |
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| author | Tarek Elsewify Hisham Elhalabi Bassem Eid |
| author_facet | Tarek Elsewify Hisham Elhalabi Bassem Eid |
| author_sort | Tarek Elsewify |
| collection | DOAJ |
| description | ABSTRACT: Introduction: The aim of this study was to assess the dynamic cyclic fatigue resistance of an R-Motion file at simulated body temperature and document corresponding phase transformations compared to OneCurve and HyFlex EDM (HFEDM). Methods: R-Motion (25/.06), OneCurve (25/.06), and HFEDM (25/.06) files were selected and divided into 3 groups (n = 9) according to the file type. Dynamic cyclic fatigue testing was done with a custom-made artificial stainless-steel canal that had a 90° angle of curvature and a 5-mm radius of curvature. Files were operated continuously at body temperature until fracture in the artificial canal. The time to fracture was calculated. Statistical analysis was performed, and significance was set at 5%. Phase transformation temperatures for 2 instruments of each group were analysed by differential scanning calorimetry (DSC) analysis. Results: The highest mean time to fracture value was measured in the HFEDM group (277.84 ± 2.51), followed by the R-Motion group (115.09 ± 0.01), whilst the lowest value was found in the OneCurve group (44.28 ± 3.63). Post hoc pairwise comparisons were all statistically significant (P < .001). DSC heating curves show austinite start temperatures to be 33.94 °C and 43.32 °C and austinite finish temperatures to be 35.09 °C and 50 °C for R-Motion and HFEDM, respectively. DSC cooling curves show martensite start temperatures to be 27.54 °C and 44.52 °C and martensite finish temperatures to be 29.13 °C and 37.68 °C for R-Motion and HFEDM, respectively. DSC curves of OneCurve failed to demonstrate transformation temperatures within the tested heat range. Conclusions: Crystalline arrangement of Ni and Ti atoms within the NiTi alloys greatly affects the dynamic cyclic fatigue resistance of the file. |
| first_indexed | 2024-03-12T01:11:50Z |
| format | Article |
| id | doaj.art-7095349144844261abe2acf62c58b30a |
| institution | Directory Open Access Journal |
| issn | 0020-6539 |
| language | English |
| last_indexed | 2024-03-12T01:11:50Z |
| publishDate | 2023-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Dental Journal |
| spelling | doaj.art-7095349144844261abe2acf62c58b30a2023-09-14T04:52:19ZengElsevierInternational Dental Journal0020-65392023-10-01735680684Dynamic Cyclic Fatigue and Differential Scanning Calorimetry Analysis of R-MotionTarek Elsewify0Hisham Elhalabi1Bassem Eid2Endodontic Department, Faculty of Dentistry, Ain Shams University, Cairo, Egypt; Restorative Dental Sciences Department, College of Dentistry, Gulf Medical University, Ajman, UAE; Corresponding author. Gulf Medical University, College of Dentistry, Thumbay Medicity, Rashid Al-khadar St., Aljurf-1, Ajman 4184, United Arab Emirates.Endodontic Department, Faculty of Dentistry, Assuit University, Assuit, EgyptRestorative Dental Sciences Department, College of Dentistry, Gulf Medical University, Ajman, UAEABSTRACT: Introduction: The aim of this study was to assess the dynamic cyclic fatigue resistance of an R-Motion file at simulated body temperature and document corresponding phase transformations compared to OneCurve and HyFlex EDM (HFEDM). Methods: R-Motion (25/.06), OneCurve (25/.06), and HFEDM (25/.06) files were selected and divided into 3 groups (n = 9) according to the file type. Dynamic cyclic fatigue testing was done with a custom-made artificial stainless-steel canal that had a 90° angle of curvature and a 5-mm radius of curvature. Files were operated continuously at body temperature until fracture in the artificial canal. The time to fracture was calculated. Statistical analysis was performed, and significance was set at 5%. Phase transformation temperatures for 2 instruments of each group were analysed by differential scanning calorimetry (DSC) analysis. Results: The highest mean time to fracture value was measured in the HFEDM group (277.84 ± 2.51), followed by the R-Motion group (115.09 ± 0.01), whilst the lowest value was found in the OneCurve group (44.28 ± 3.63). Post hoc pairwise comparisons were all statistically significant (P < .001). DSC heating curves show austinite start temperatures to be 33.94 °C and 43.32 °C and austinite finish temperatures to be 35.09 °C and 50 °C for R-Motion and HFEDM, respectively. DSC cooling curves show martensite start temperatures to be 27.54 °C and 44.52 °C and martensite finish temperatures to be 29.13 °C and 37.68 °C for R-Motion and HFEDM, respectively. DSC curves of OneCurve failed to demonstrate transformation temperatures within the tested heat range. Conclusions: Crystalline arrangement of Ni and Ti atoms within the NiTi alloys greatly affects the dynamic cyclic fatigue resistance of the file.http://www.sciencedirect.com/science/article/pii/S0020653922002842AustiniteElectric discharge machiningMartensiteReciprocationRotation |
| spellingShingle | Tarek Elsewify Hisham Elhalabi Bassem Eid Dynamic Cyclic Fatigue and Differential Scanning Calorimetry Analysis of R-Motion International Dental Journal Austinite Electric discharge machining Martensite Reciprocation Rotation |
| title | Dynamic Cyclic Fatigue and Differential Scanning Calorimetry Analysis of R-Motion |
| title_full | Dynamic Cyclic Fatigue and Differential Scanning Calorimetry Analysis of R-Motion |
| title_fullStr | Dynamic Cyclic Fatigue and Differential Scanning Calorimetry Analysis of R-Motion |
| title_full_unstemmed | Dynamic Cyclic Fatigue and Differential Scanning Calorimetry Analysis of R-Motion |
| title_short | Dynamic Cyclic Fatigue and Differential Scanning Calorimetry Analysis of R-Motion |
| title_sort | dynamic cyclic fatigue and differential scanning calorimetry analysis of r motion |
| topic | Austinite Electric discharge machining Martensite Reciprocation Rotation |
| url | http://www.sciencedirect.com/science/article/pii/S0020653922002842 |
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