A comparative evaluation of cyclic fatigue resistance of FlexiCON (Edge Endo) files in rotary versus reciprocating motion at various curvatures – An in vitro study

Abstract

Aim: The aim of the study to compare the cyclic fatigue resistance of FlexiCON (Edge Endo) files in rotary versus reciprocating motion in coronal, middle, and apical curvature of the simulated artificial canal. Materials and Methods: A total number of 36 new files, 25 mm length of ISO size 25 at the tip and a taper of 0.06, were used for the study and divided into two groups of 18 files each. Group I: FlexiCON X 3 , was used in a rotary motion and Group II: FlexiCON X 1 was used in a reciprocating motion. Cyclic fatigue testing was conducted in a custom-made device that allowed for a reproducible simulation of a curved canal. The canal system, which comprised two adjustable stainless steel blocks, had a 60° angle of curvature and 3 mm width. The groups were further divided into three subgroups with six files in each, representing apical curvature (Group Ia/IIa), middle curvature (Group Ib/IIb), and Coronal curvature (Group Ic/IIc). Using X-Smart plus motor, files were used in rotary and reciprocating mode and the number of cycles to failure was recorded. Statistical Analysis: Data were analyzed using ANOVA and Post hoc followed by Dunnett's test and unpaired t -test using Statistical Package for the Social Sciences 16 version. Results: FlexiCON X1 reciprocating files showed the maximum cyclic fatigue resistance at coronal curvature (1936.50 ± 1.09) followed by middle (1514.50 ± 1.07) and apical curvature (1487.50 ± 6.75), while FlexiCON X3 rotary files showed the maximum cyclic fatigue at the middle curvature (1106.00 ± 4.21), followed by coronal (920.00 ± 1.16) and apical curvature (757.00 ± 5.34). The statistical analysis revealed a statistically significant difference ( P = 0.001) between the two groups. Conclusion: FlexiCON X1 reciprocating files showed better cyclic fatigue resistance at coronal, middle, and apical curvature compared to FlexiCON X3 rotary files.

Cyclic Fatigue Resistance Of EdgeFile X7, Edge One, WaveOne Gold And WaveOne Rotary Files Using Artificial Canals With Different Angles And Radii Of Curvature

“…Regarding the two systems made of FireWire; EdgeOne reciprocating file and EdgeFile X7 rotation file, EdgeOne had more cyclic fatigue resistance than EdgeFileX7 which was statistically significant, this result was in accordance with Mathew et al 2019 (37) who tested the cyclic fatigue resistance of two EdgeEndo fire wire files; one reciprocation motion file and one rotational motion file and showed that reciprocation motion files had better cyclic fatigue resistance than the rotational ones.…”

An in vitro comparison of alterations in surface topographies of three different rotary files after root canal preparation with different irrigating solutions: Atomic force microscopic study

“…Several NiTi files have been introduced with reciprocating motion, as they show lesser amount of surface deformation or irregularities of the files, thereby increasing their fracture resistance and life span. [ 2 ]…”