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Introduction: The purpose of this study was to evaluate cyclic fatigue fracture resistance of engine-driven nickel-titanium (K3XF) instruments under reciprocating movement in various angles. Methods: Fifty K3XF size 40 taper 0.06 nickel-titanium instruments were divided randomly into 5 groups of 10 each. All instruments were subjected to cyclic fatigue tests. Instruments in groups 1-4 were tested by using different reciprocating motions, whereas instruments of group 5 (control group) were used in continuous rotation. All instruments were rotated or reciprocated until fracture occurred. Time to fracture was recorded, and data were statistically analyzed by using one-way analysis of variance, followed by Tukey honestly significant difference test for comparison between different groups. Results: All reciprocating groups (groups 1-4) showed a significant increase in time to failure when compared with group 5 (continuous rotation) (P < .05). Mean time was significantly higher in group 1, followed by group 2. No significant difference was found between groups 3 and 4 (P = .251). Increasing the clockwise angle of reciprocation and consequently increasing the angle of progression for each reciprocation cycle reduced the resistance to cyclic fatigue. Conclusions: Movement kinematics (reciprocating movements in various angles) had a significant influence on the cyclic fatigue life of the tested nickel-titanium instruments. (J Endod 2012;38:1408-1411)

Influence of Different Angles of Reciprocation on the Cyclic Fatigue of Nickel-Titanium Endodontic Instruments / Gambarini, Gianluca; Alessio Giansiracusa, Rubini; Dina Al, Sudani; Richard, Gergi; Culla, Antonio; DE ANGELIS, Francesca; DI CARLO, Stefano; Pompa, Giorgio; Nada, Osta; Testarelli, Luca. - In: JOURNAL OF ENDODONTICS. - ISSN 0099-2399. - STAMPA. - 38:10(2012), pp. 1408-1411. [10.1016/j.joen.2012.05.019]

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