Assessment of Kinematic Motions on The Cyclic Fatigue Resistance of Two Nickel Titanium Systems in Non-Surgical Retreatment

Document Type : Original research articles

Authors

1 Dpartment of Endodontics, Misr International University

2 Professor of Endodontics, Endodontics Department, Faculty of Dentistry, Ain Shams University, Cairo.Egypt.

3 Associate 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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