Deflection Evaluation of Thermoactivated Nickel-Titanium Archwires after Heat Treatment on their Distal Ends
| Autor: | Gurgel Jde A, Etevaldo Matos Maia Filho, Álvaro Henrique Borges, Fonseca Junior Fm, Mateus Rodrigues Tonetto, Bandéca Mc, Célia Regina Maio Pinzan-Vercelino, Fausto Silva Bramante, Rudys Rodolfo De Jesus Tavarez |
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| Rok vydání: | 2015 |
| Předmět: |
Dental Stress Analysis
Titanium Universal testing machine Hot Temperature Materials science Orthodontic Brackets Surface Properties Mandibular first molar Elasticity Phase Transition Nickel Deflection (engineering) Nickel titanium Materials Testing Orthodontic Wires Humans Orthodontic Appliance Design Stress Mechanical Composite material General Dentistry Dental Alloys |
| Zdroj: | The Journal of Contemporary Dental Practice. 16:91-95 |
| ISSN: | 1526-3711 |
| Popis: | Objective This study evaluated in vitro the mechanical changes of 0.018” (0.45 mm) and 0.016 × 0.022” (0.40 × 0.55 mm) thermoactivated nickel-titanium archwires subjected to heat treatment on their distal ends. Materials and methods Ten archwires in diameters 0.018” and 0.016 × 0.022” by different manufacturers Ormco, Morelli, Orthometric and Unitek were tested. Each tested archwire had an experimental side, submitted to heat treatment, and an annealing-free control. Tests for load/deflection were performed using a universal testing machine, with temperature control in the austenitic transformation phase through temperaturecontrolled chamber. The variables showed normal distribution (Kolmogorov-Smirnov), the t-student test was applied in order to observe the difference between the experimental and control groups. Statistical significance was set at p < 0.05. Results There were no statistically significant differences between the groups. Conclusion Heat treatment carried out in the region corresponding to the first molar distal region on thermoactivated nickel-titanium archwires did not influence the load/deflection values in adjacent portion. How to cite this article Bramante FS, da Fonseca Junior FM, Pinzan-Vercelino CRM, de Araújo Gurgel J, de Jesus Tavarez RR, Filho EMM, Tonetto MR, Borges AH, Bandéca MC. Deflection Evaluation of Thermoactivated Nickel-Titanium Archwires after Heat Treatment on their Distal Ends. J Contemp Dent Pract 2015;16(2):91-95. |
| Databáze: | OpenAIRE |
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