E-ISSN 2548-0839
Volume : 9 Issue : 2 Year : 2024


5 year Impact Factor
2022 CiteScore
Journal Citation Reports (Clarivate, 2023)(Dentistry, Oral Surgery & Medicine (Science))
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Dynamic Cyclic Fatigue Resistance of Heat-treated Nickel Titanium Instruments in Reciprocating Motion [Eur Endod J]
Eur Endod J. 2023; 8(3): 201-206 | DOI: 10.14744/eej.2023.73792

Dynamic Cyclic Fatigue Resistance of Heat-treated Nickel Titanium Instruments in Reciprocating Motion

Thaís Kauana Magalhães Sobral1, Lucila Piasecki2, Flávia Sens Fagundes Tomazinho3, Alison Luís Kirchhoff4, Marilisa Carneiro Leão Gabardo3, Natanael Henrique Ribeiro Mattos5, Flares Baratto Filho6, Luiz Fernando Fariniuk7
1Department of Dentistry, Centro Universitário UniDomBosco, Curitiba, Brazil
2Department of Periodontics and Endodontics, University at Buffalo, Buffalo, USA
3Department of Dentistry, School of Health Sciences, Universidade Positivo, Curitiba, Brazil
4Department of Dentistry, Unicesumar, Curitiba, Brazil
5Department of Dentistry, Universidade Tuiuti do Paraná, Curitiba, Brazil
6Department of Dentistry, Universidade da Região de Joinville, Joinville, Brazil
7Specialization in Endodontics, IOA Boutique Curitiba, Curitiba, Brazil

Objective: To compare the fatigue resistance of different heat-treated reciprocating instruments tested in a dynamic cyclic fatigue model.
Methods: Forty-eight new instruments were inspected under magnification and selected for this study, and then divided as follows (n=12): X1 Blue (MK Life, Porto Alegre, RS, Brazil), Pro-R (MK Life), Reciproc (VDW, Munich, Germany), and Reciproc Blue (VDW). Artificial canals presenting a curvature of 60° angle and 5 mm radius were milled in zirconia. The block containing the artificial canals was mounted in a container filled with water kept at 37°C. A specially designed device was used to perform controlled axial movements while the instruments were activated inside the canals. Time to failure was recorded in seconds, and fragment lengths were measured (mm). Data were analyzed statistically with the significance level set at 5% (One-Way ANOVA and Tukey test).
Results: Pro-R and Reciproc Blue instruments presented the highest fatigue resistance, being significantly different from the other tested files (p<0.05). Reciproc presented intermediate results, significantly different X1 Blue (p<0.05). The fractographic analysis showed typical features of cyclic fatigue for all instruments.
Conclusion: Pro-R and Reciproc Blue instruments are more resistant to dynamic cyclic fatigue than the Reciproc and X1 Blue. (EEJ-2022-10-124)

Keywords: Dental instruments, dynamic cyclic fatigue, endodontics, nickel-titanium, reciprocation

Thaís Kauana Magalhães Sobral, Lucila Piasecki, Flávia Sens Fagundes Tomazinho, Alison Luís Kirchhoff, Marilisa Carneiro Leão Gabardo, Natanael Henrique Ribeiro Mattos, Flares Baratto Filho, Luiz Fernando Fariniuk. Dynamic Cyclic Fatigue Resistance of Heat-treated Nickel Titanium Instruments in Reciprocating Motion. Eur Endod J. 2023; 8(3): 201-206

Corresponding Author: Flares Baratto Filho
Manuscript Language: English
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