Deflection test evaluation of different lots of the same nickel-titanium wire commercial brand
| Autor: | Murilo Gaby Neves, Fabrício Viana Pereira Lima, Júlio de Araújo Gurgel, Célia Regina Maio Pinzan-Vercelino, Fernanda Soares Rezende, Gustavo Antônio Martins Brandão |
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| Jazyk: | English<br />Portuguese |
| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Dental Press Journal of Orthodontics, Vol 21, Iss 1, Pp 42-46 (2016) |
| Druh dokumentu: | article |
| ISSN: | 2177-6709 17746760 |
| DOI: | 10.1590/2177-6709.21.1.042-046.oar |
| Popis: | Introduction: The aim of this in vitro study was to compare the elastic properties of the load-deflection ratio of orthodontic wires of different lot numbers and the same commercial brand. Methods: A total of 40 nickel-titanium (NiTi) wire segments (Morelli OrtodontiaTM - Sorocaba, SP, Brazil), 0.016-in in diameter were used. Groups were sorted according to lot numbers (lots 1, 2, 3 and 4). 28-mm length segments from the straight portion (ends) of archwires were used. Deflection tests were performed in an EMIC universal testing machine with 5-N load cell at 1 mm/minute speed. Force at deactivation was recorded at 0.5, 1, 2 and 3 mm deflection. Analysis of variance (ANOVA) was used to compare differences between group means. Results: When comparing the force of groups at the same deflection (3, 2 and 1 mm), during deactivation, no statistical differences were found. Conclusion: There are no changes in the elastic properties of different lots of the same commercial brand; thus, the use of different lots of the orthodontic wires used in this research does not compromise the final outcomes of the load-deflection ratio. |
| Databáze: | Directory of Open Access Journals |
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