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Forces in initial archwires during leveling and aligning: An in-vitro study

AIM: This in-vitro study measured the force deflection behavior of selected initial alignment archwires by conducting three-point bending tests under controlled tests. The study tested three wire designs, namely, co-axial multistranded stainless steel wires, nickel–titanium, and copper–nickel–titani...

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Detalles Bibliográficos
Autores principales: Reddy, Rajesh Kumar, Katari, Pavan K., Bypureddy, Tarun T., Anumolu, Venkata Naga Sri Harsha, Kartheek, Yenugupalli, Sairam, Nemala. R. V.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Medknow Publications & Media Pvt Ltd 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5109854/
https://www.ncbi.nlm.nih.gov/pubmed/27891306
http://dx.doi.org/10.4103/2231-0762.192940
Descripción
Sumario:AIM: This in-vitro study measured the force deflection behavior of selected initial alignment archwires by conducting three-point bending tests under controlled tests. The study tested three wire designs, namely, co-axial multistranded stainless steel wires, nickel–titanium, and copper–nickel–titanium archwires. MATERIALS AND METHODS: The archwires were ligated to a specially designed metal jig, simulating the arch. A testing machine (Instron) recorded activation and deactivation forces of different deflections at 37°C. Forces on activation and deactivation were compared by one-way analysis of variance (ANOVA). RESULTS: Significant differences (P < 0.05) in activation and deactivation forces were observed among the tested wires. The co-axial multistranded wire had the lowest mean activation and deactivation forces, whereas conventional nickel–titanium wires had more mean activation and deactivation forces at different deflections. CONCLUSION: The activation and deactivation forces were higher for nickel–titanium followed by copper–nickel titanium and co-axial wires. The amount of percentage force loss was more for co-axial wire, indicating that these wires are not ideal for initial leveling and aligning.