Fayez, M., Mahran, A., Galal, M. (2025). Assessment of Kinematic Motions on The Cyclic Fatigue Resistance of Two Nickel Titanium Systems in Non-Surgical Retreatment. Journal of Fundamental and Clinical Research, 5(1), 40-51. doi: 10.21608/jfcr.2025.302348.1086
Marina Thabet Fayez; Abeer H. Mahran; Manar M. Galal. "Assessment of Kinematic Motions on The Cyclic Fatigue Resistance of Two Nickel Titanium Systems in Non-Surgical Retreatment". Journal of Fundamental and Clinical Research, 5, 1, 2025, 40-51. doi: 10.21608/jfcr.2025.302348.1086
Fayez, M., Mahran, A., Galal, M. (2025). 'Assessment of Kinematic Motions on The Cyclic Fatigue Resistance of Two Nickel Titanium Systems in Non-Surgical Retreatment', Journal of Fundamental and Clinical Research, 5(1), pp. 40-51. doi: 10.21608/jfcr.2025.302348.1086
Fayez, M., Mahran, A., Galal, M. Assessment of Kinematic Motions on The Cyclic Fatigue Resistance of Two Nickel Titanium Systems in Non-Surgical Retreatment. Journal of Fundamental and Clinical Research, 2025; 5(1): 40-51. doi: 10.21608/jfcr.2025.302348.1086
Assessment of Kinematic Motions on The Cyclic Fatigue Resistance of Two Nickel Titanium Systems in Non-Surgical Retreatment
1Dpartment of Endodontics, Misr International University
2Professor of Endodontics, Endodontics Department, Faculty of Dentistry, Ain Shams University, Cairo.Egypt.
3Associate Researcher Professor of Endodontics, Oral and Dental Research Institute, National Research Centre, Cairo, Egypt.
Abstract
Background: Removal of obturating materials from curved root canals affects the cyclic fatigue resistance (CFR) of Nickel Titanium instruments (NiTi). Kinematic motion such as Reciprocation motion is thought to have a higher CFR than the single continuous rotation motion. Also, clinical usage of NiTi instruments influences the CFR of the files. Aim: To evaluate the effect of using two kinematic motions on the CFR of two NiTi files after removing obturating materials in the retreatment of curved canals. Materials and Methods: A total of Eighteen sets of X1 EdgeFile used in reciprocation motion and X7 EdgeFile used in single continuous rotation motion (n=9 each) size 25, taper 6% were evaluated for CFR testing inside a custom-made artificial canal (60⁰ angle, 2 mm radius of curvature). Each group was subdivided into three subgroups (n=3 each) according to the number of usages: subgroup (A): New X7, Subgroup (B): X7 used after 3 root canal retreatments (Re-RCT), Subgroup (C): X7 Used after 9 Re-RCT, Subgroup (D): New X1, Subgroup (E): X1 Used after 3 Re-RCT, Subgroup (F): X1 Used after 9 Re-RCT. The number of Cycles to failure (NCF) was then achieved. Results: Reciprocation had a considerably greater NCF value than rotation (p < 0.001). The highest NCF value was found in new files, followed by 3 then 9 Re-RCT. Conclusion: EdgeFile X1 had a higher CFR than EdgeFile X7. New EdgeFile X1 and X7 showed the highest CFR when compared to EdgeFile X1 and X7 used after 3 and 9 Re-RCT.
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