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

Autor: Weissheimer T; Department of Conservative Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil., Duarte MAH; Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil., Só MVR; Department of Conservative Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil., da Rosa RA; Department of Conservative Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil., Espinosa MK; Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil., Vivan RR; Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil., Alcalde MP; Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil.
Jazyk: angličtina
Zdroj: Australian endodontic journal : the journal of the Australian Society of Endodontology Inc [Aust Endod J] 2023 Dec; Vol. 49 (3), pp. 524-529. Date of Electronic Publication: 2023 Jul 13.
DOI: 10.1111/aej.12774
Abstrakt: 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° ± 1°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.
(© 2023 Australian Society of Endodontology Inc.)
Databáze: MEDLINE
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