Influence of surface grooves orientation on the cyclic fatigue resistance of NiTi wire.

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Title:	Influence of surface grooves orientation on the cyclic fatigue resistance of NiTi wire.
Authors:	Pereira LOPES, Helio¹, Nelson ELIAS, Carlos¹, Martins FERREIRA, Ligia¹, Chaves de SOUZA, Leticia², Pereira LOPES, Weber Schmidt³, Nogueira Leal SILVA, Emmanuel João⁴, Leal VIEIRA, Victor Talarico⁴ victortalarico@yahoo.com.br
Source:	Dental Press Endodontics. Jan-Apr2021, Vol. 11 Issue 1, p40-45. 6p.
Subjects:	CYCLIC fatigue, NICKEL-titanium alloys, FATIGUE life, NULL hypothesis, FATIGUE testing machines
Abstract:	Objective: this study tested the null hypothesis that the surface grooves orientation does not influence the NiTi wire cyclic fatigue. Material and methods: Segments of NiTi wire (Moreli, Sorocaba, Brazil) measuring 30mm and with a 0.40mm of diameter were used. Grooves were created in the longitudinal direction, at 45 degrees and 90 degrees. The wire was analyzed with SEM and the roughness was quantified by interferometry. The number of cycles until fracture (NCF) was determined by the cyclic fatigue test. Results: the roughness between 45 and 90 degrees groups presented differences (p<0.05). The group without grooves presented the highest NCF (p<0.05). The group with 45 degrees grooves presented better NCF in comparison to the group with 90 degrees (p<0.05). Conclusions: the direction of the grooves influences the fatigue life. The NCF increases with the reduction of the angle of the grooves in relation to the long axis, regardless of the depth of the grooves. [ABSTRACT FROM AUTHOR]
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Database:	MedicLatina

Description
Abstract:	Objective: this study tested the null hypothesis that the surface grooves orientation does not influence the NiTi wire cyclic fatigue. Material and methods: Segments of NiTi wire (Moreli, Sorocaba, Brazil) measuring 30mm and with a 0.40mm of diameter were used. Grooves were created in the longitudinal direction, at 45 degrees and 90 degrees. The wire was analyzed with SEM and the roughness was quantified by interferometry. The number of cycles until fracture (NCF) was determined by the cyclic fatigue test. Results: the roughness between 45 and 90 degrees groups presented differences (p<0.05). The group without grooves presented the highest NCF (p<0.05). The group with 45 degrees grooves presented better NCF in comparison to the group with 90 degrees (p<0.05). Conclusions: the direction of the grooves influences the fatigue life. The NCF increases with the reduction of the angle of the grooves in relation to the long axis, regardless of the depth of the grooves. [ABSTRACT FROM AUTHOR]
ISSN:	21783713
DOI:	10.14436/2358-2545.11.1.040-045.oar