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

Helio Pereira LOPES, Carlos Nelson ELIAS, Ligia Martins FERREIRA, Leticia Chaves de SOUZA, Weber Schmidt Pereira LOPES, Emmanuel João Nogueira Leal SILVA, Victor Talarico Leal VIEIRA

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.

Keywords: Dental Alloys. Surface Properties. Physical Properties

How to cite: Lopes HP, Elias CN, Ferreira LM, Souza LC, Lopes WSP, Silva EJNL, Vieira VTL. Influence of surface grooves orientation on the cyclic fatigue resistance of NiTi wire. Dental Press Endod. 2021 Jan-Apr;11(1):40-5.

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