Evaluation of cyclic and torsional fatigue resistance of several heat-treated reciprocating nickel-titanium instruments

Author(s)

Weissheimer, Theodoro ; Duarte, Marco Antonio Hungaro ; So, Marcus Vinicius Reis ; da Rosa, Ricardo Abreu ; Espinosa, Michel Klymus ; Vivan, Rodrigo Ricci ; Alcalde, Murilo Priori

• Document type: Journal article
• Source: AUSTRALIAN ENDODONTIC JOURNAL; v. N/A, p. 6-pg., 2023-07-13.

Abstract

This study investigated the cyclic fatigue and torsional resistance of Unicone Plus (UCP 25.06), Unicone (UC 25.06), Reciproc Blue (RB 25.08) and Wave One Gold (WOG 25.07) performed at body temperature (35 degrees +/- 1 degrees C). Time and number of cycles to fracture (NCF), as well as torque and angular deflection were recorded. Fractured surfaces were evaluated by scanning electron microscopy (SEM). Data were analysed using one-way ANOVA and Holm-Sidak's tests for multiple comparison. The RB had a significantly higher time to fracture, followed by the WOG and UCP (p < 0.05). Regarding the NCF, there was no significantly difference between RB and WOG (p > 0.05). UC presented highest torque values and the lowest angular deflection (p < 0.05). SEM analysis demonstrated typical failures features in both cyclic and torsional fatigue tests. Overall, UC had the lowest time, NCF and angular deflection at fracture. RB presented the highest time to fracture and angular deflection values. (AU)

• FAPESP's process: 14/25520-0 - Evaluation of chemical properties, torsional and flexural resistance, geometric and superficial characterization of endodontic instruments depending on the alloy treatment: analysis after 3 times simulating clinical use
• Grantee: Rodrigo Ricci Vivan
• Support Opportunities: Regular Research Grants