Investigating the Loading, Unloading, and Permanent Deformation of Newly Available Epoxy Resin Coated Ni-Ti Wires Using Self-Ligating Brackets
The goal of this study was to assess the load and unload deflection, as well as the permanent deformation, of round 0.016” and rectangular 0.016” 0.022” regular and coated Ni-Ti wires. Despite the disadvantages of coated Ni-Ti arch wires, this type of wire is still marketed; as a result, new manufacturers are available today. Materials and Procedures: Two manufacturers’ Ni-Ti archwires were evaluated. A three-point bending test was performed on regular and coated round and rectangular Ni-Ti wire segments (n= 15) from each group. At the end of a recovery cycle, both types of wires were evaluated for permanent deformation. The coated round 0.016” Ni-Ti wires produced significantly lower loading (p 0.01) and unloading (p 0.01) forces than regular wires of the same manufacturer and size. There was no discernible difference in permanent deformation between coated and uncoated round Ni-Ti wires from the same manufacturer. The loading evaluation revealed a significant difference for rectangular 0.0160.022” Ni-Ti wires, but the unloading test revealed no significant differences. The rectangular wires’ permanent deformation revealed no discernible difference between them. Conclusion: The addition of an esthetic coating to these new Ni-Ti wires resulted in changes in their mechanical properties, manufacturability, and durability.
Author (S) Details
Private Practice, San Jose, Costa Rica.
María Cristina Jiménez-Cervantes
Department of Orthodontics, Universidad Intercontinental, Mexico City, Mexico.
Instituto Nacional de Investigaciones Nucleares and Universidad Intercontinental, Mexico City, Mexico.
Universidad Intercontinental, Mexico City, Mexico.
Universidad Intercontinental e Universidad Autonoma´ Metropolitana, Mexico City, Mexico.
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