Dynamic Cyclic Fatigue and Differential Scanning Calorimetry Analysis of R-Motion

Research Abstract

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.

Research Authors
Tarek Elsewify , Hisham Elhalabi , Bassem Eid
Research Date
Research Department
Department of Root Therapy
Research File
paper 4.pdf (491.89 KB)
Research Journal
International Dental Journal Elsevier
Research Member
Hisham Moustafa EzzEldin ElHalaby
Research Pages
680-684
Research Publisher
Elsevier
Research Rank
International
Research Vol
73
Research Website
https://www.sciencedirect.com/science/article/pii/S0020653922002842?via%3Dihub
Research Year
2023

Seminar: Be Positive for Your Country and Participate in the 2024 Presidential Elections

The Student Union of the Faculty of Dentistry will hold an awareness Seminar entitled, “Be Positive for Your Country and Participate in the 2024 Presidential Elections”, on Sunday 3 November 2023 in the Defense Hall on the fifth floor at noon. The seminar will be delivered by Prof./ Doweib Saber, Dean of the Faculty of Law, and Prof./ Ragab Elkahlawy, Vice Dean for Education and Student Affairs in the Faculty of Law.

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Assiut University Hosted Scientific Conference for Dental Students

The Faculty of Dentistry at Assiut University held the Scientific Conference for Dental Students on Saturday, 25 November 2023, entitled, "Future Dentistry by Future Dentists", with the participation of dental colleges from the following universities: (Assiut National University, Badr University, Al-Azhar University, and Sphinx University).

The conference was organized by the Faculty of Dentistry at Assiut University The conference featured a variety of presentations and workshops on topics related to dentistry, including:

  • The latest advances in dental care
  • The challenges facing the dental profession
  • The future of dentistry

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اعلان عن مهرجان الابداع (12) للعام الدراسي 2023/2024

The Central Youth Welfare has announced that Prof. Ahmed Mohamed Ahmed Abd El-Mawla, Acting Vice-President for Education & Students' Affairs, has approved participation for all Assiut University students in the 12th Creativity Festival for the 2023/2024 academic year. This festival celebrates creativity and innovation in young people from across Egypt. Submissions are due on November 30, 2023. To participate, please register with the Family Committee of the Youth Welfare Administration.

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12th Season of Model Arab League

The Central Youth Welfare (CYW) is excited to announce the 12th season of its Model Arab League program. This prestigious program provides an exceptional opportunity for young people to delve into the world of international relations and diplomacy, specifically focusing on the Arab world.

Program Details

  • Program Dates: November 20, 2023 – December 13, 2023
  • Workshop Schedule: Three days a week (Monday, Tuesday, and Wednesday)
  • Location: [Alrowad Hall in Assiut Stadium]

Time: from 9:00 a.m. to 12 p.m..

20th Meeting of The Faculty Council

The Faculty of Dentistry held its 20th meeting on Monday 20, November 2023. The attendees were Prof./ Safa Tohamy, Dean of the Faculty, Prof/ Heba Rashed, Vice Dean for Community Services and Environmental Development, Prof/ Muhammad Badawy, Vice Dean for Education and Student Affairs, Prof./ Muhammad Nahed, Head of Assiut Dental Hospital, and heads of the departments to discuss the agenda of the faculty.


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Applauding the Top Winners of the Bench Press Championship

The Faculty of Dentistry would like to congratulate the top winners of the Bench Press championship organized by the Student Families Committee. The winners are:

  1. Ali Muhammad Ali Azab
  2. Mina Amgad Fayez
  3. Ahmad Waleed Ahmad
  4. Ahmad Salah Ali

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Rescheduling Biochemistry Lectures for 2nd Year Students (Assiut University - Assiut National University)

The Biochemistry Department at the Faculty of Medicine sincerely apologizes to all second-year students in Assiut University and Assiut National University for the cancellation of their lectures scheduled for Tuesday and Thursday. This unforeseen disruption is due to the demanding schedule of our faculty members, who are currently engaged in conducting and grading examinations for the Faculty of Medicine.

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