The effect of temperature change on the cyclic fatigue resistance of Three Rotary Nickel Titanium instruments with different Heat Treatment | ||
| Ain Shams Dental Journal | ||
| Article 4, Volume 21, Issue 1, March 2021, Pages 12-19 PDF (487.07 K) | ||
| Document Type: Original articles | ||
| DOI: 10.21608/asdj.2021.54434.1004 | ||
| Authors | ||
| Heba Adel Elgendy* ; Ahmed Abd Elrahman Hashem; Tarek Moustafa Abdel Aziz | ||
| Ain Shams University | ||
| Abstract | ||
| Aim This manuscript aimed to compare the cyclic fatigue resistance of the RaCe, 2Shape, and M-pro instruments at room (22°C) and body (37°C) temperatures and to investigate their phase transformation. Materials and methods A total of 60 files #25 .06 of the RaCe, 2Shape, and M-pro instruments were selected. A dynamic cyclic fatigue testing device with a custom-made stainless-steel canal was used that had 60° and 3mm radius of curvature. Files were divided into three groups (n=20). Each group was subdivided into 2 subgroups according to the temperature during the test: SubgroupA (room temperature 22±0.5°C) and SubgroupB (body temperature 37±0.5°C). Samples were rotated continuously in an axial motion until fracture occurred then number of cycles to fracture (NCF) was calculated. Five test specimens of each file type size 25/.06 were investigated using differential scanning calorimetry. Results The 2Shape file showed the highest cyclic fatigue resistance followed by the M-pro file and the least was the RaCe file. in subgroup A, there was a significant difference between the three files. in subgroup B, the 2Shape file and the RaCe file were significantly different but there was no significant difference between the 2Shape and the M-pro. The rise in temperature was accompanied by a decrease in the cyclic fatigue resistance of the RaCe and the 2Shape files. While there was an insignificant decrease in the M-pro file. Conclusion The 2Shape has the highest cyclic fatigue resistance among the tested instruments. The environmental temperature plays a key role in the fatigue behavior. | ||
| Keywords | ||
| Cyclic fatigue; RaCe; 2Shape; M-pro; Differential scanning calorimetry | ||
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