Comparison of deflection forces of esthetic archwires combined with ceramic brackets

  • Murilo MATIAS Universidade de São Paulo; Faculdade de Odontologia de Bauru; Departamento de Odontopediatria, Ortodontia e Saúde Coletiva
  • Marcos Roberto de FREITAS Universidade de São Paulo; Faculdade de Odontologia de Bauru; Departamento de Odontopediatria, Ortodontia e Saúde Coletiva
  • Karina Maria Salvatore de FREITAS Faculdade Ingá; Departamento de Ortodontia
  • Guilherme JANSON Universidade de São Paulo; Faculdade de Odontologia de Bauru; Departamento de Odontopediatria, Ortodontia e Saúde Coletiva
  • Rodrigo Hitoshi HIGA Universidade de São Paulo; Faculdade de Odontologia de Bauru; Departamento de Odontopediatria, Ortodontia e Saúde Coletiva
  • Manoela Fávaro FRANCISCONI Universidade de São Paulo; Faculdade de Odontologia de Bauru; Departamento de Odontopediatria, Ortodontia e Saúde Coletiva
Keywords: Orthodontic archwires, Orthodontic brackets, Esthetics, Coating

Abstract

Coated archwires and ceramic brackets have been developed to improve facial esthetics during orthodontic treatment. However, their mechanical behavior has been shown to be different from metallic archwires and brackets. Therefore, the aim of this study was to compare the deflection forces in coated nickel-titanium (NiTi) and esthetic archwires combined with ceramic brackets. Material and Methods Non-coated NiTi (NC), rhodium coated NiTi (RC), teflon coated NiTi (TC), epoxy coated NiTi (EC), fiber-reinforced polymer (FRP), and the three different conventional brackets metal-insert polycrystalline ceramic (MI-PC), polycrystalline ceramic (PC) and monocrystalline ceramic (MC) were used. The specimens were set up on a clinical simulation device and evaluated in a Universal Testing Machine (Instron). An acrylic device, representative of the right maxillary central incisor was buccolingually activated and the unloading forces generated were recorded at 3, 2, 1 and 0.5 mm. The speed of the testing machine was 2 mm/min. ANOVA and Tukey tests were used to compare the different archwires and brackets. Results The brackets presented the following decreasing force ranking: monocrystalline, polycrystalline and polycrystalline metal-insert. The decreasing force ranking of the archwires was: rhodium coated NiTi (RC), non-coated NiTi (NC), teflon coated NiTi (TC), epoxy coated NiTi (EC) and fiber-reinforced polymer (FRP). At 3 mm of unloading the FRP archwire had a plastic deformation and produced an extremely low force in 2; 1 and 0.5 mm of unloading. Conclusion Combinations of the evaluated archwires and brackets will produce a force ranking proportional to the combination of their individual force rankings.

Downloads

Download data is not yet available.
Published
2018-01-01
Section
Original Articles