<abstract xmlns="http://www.w3.org/1999/xhtml">

<italic>Background:</italic> It has been demonstrated that fluoride prophylactic agents may cause hydrogen absorption in NiTi wires and degrade their mechanical properties.
<italic>Aims:</italic> To investigate the effect of a fluoride mouthwash on load-deflection characteristics of three types of nickel-titanium-based orthodontic archwires.
<italic>Methods:</italic> Twenty maxillary 0.016 inch round specimens from each of the single-strand NiTi (Rematitan ‘Lite’), multi-strand NiTi (SPEED Supercable) and Copper NiTi (Damon Copper NiTi) wires were selected. The specimens were kept in either 0.2% NaF or artificial saliva solutions at 37°C for 24 hours (N = 10). The wire load-deflection properties were measured by a Zwick testing machine, using a three-point bending test. An un-paired student’s <italic>t</italic>-test, a one-way ANOVA and a Tukey post-hoc test were used to assess statistical significance.
<italic>Results:</italic> Immersion in NaF solution affected the load-deflection properties of NiTi wires. The unloading forces at 0.5 and 1.0 mm deflections were significantly lower in fluoride-treated specimens compared with the control groups (<italic>p</italic> &lt; 0.05). Unloading forces at 1.5, 2.0 and 2.5 mm deflections were not statistically different between fluoride- and saliva-treated specimens (<italic>p</italic> > 0.05).
<italic>Conclusions:</italic> The results suggested that subjecting NiTi wires to fluoride agents decreased associated unloading forces, especially at lower deflections, and may result in delayed tooth alignment.
</abstract>

Background: It has been demonstrated that fluoride prophylactic agents may cause hydrogen absorption in NiTi wires and degrade their mechanical properties.
Aims: To investigate the effect of a fluoride mouthwash on load-deflection characteristics of three types of nickel-titanium-based orthodontic archwires.
Methods: Twenty maxillary 0.016 inch round specimens from each of the single-strand NiTi (Rematitan ‘Lite’), multi-strand NiTi (SPEED Supercable) and Copper NiTi (Damon Copper NiTi) wires were selected. The specimens were kept in either 0.2% NaF or artificial saliva solutions at 37°C for 24 hours (N = 10). The wire load-deflection properties were measured by a Zwick testing machine, using a three-point bending test. An un-paired student’s t-test, a one-way ANOVA and a Tukey post-hoc test were used to assess statistical significance.
Results: Immersion in NaF solution affected the load-deflection properties of NiTi wires. The unloading forces at 0.5 and 1.0 mm deflections were significantly lower in fluoride-treated specimens compared with the control groups (p < 0.05). Unloading forces at 1.5, 2.0 and 2.5 mm deflections were not statistically different between fluoride- and saliva-treated specimens (p > 0.05).
Conclusions: The results suggested that subjecting NiTi wires to fluoride agents decreased associated unloading forces, especially at lower deflections, and may result in delayed tooth alignment.

The effect of fluoride exposure on the load-deflection properties of superelastic nickel-titanium-based orthodontic archwires

Australasian Orthodontic Journal

This work is licensed under the Creative Commons Attribution 4.0 International License.

Background: It has been demonstrated that fluoride prophylactic agents may cause hydrogen absorption in NiTi wires and degrade their mechanical properties.
Aims: To investigate the effect of a fluoride mouthwash on load-deflection characteristics of three types of nickel-titanium-based orthodontic archwires.
Methods: Twenty maxillary 0.016 inch round specimens from each of the single-strand NiTi (Rematitan ‘Lite’), multi-strand NiTi (SPEED Supercable) and Copper NiTi (Damon Copper NiTi) wires were selected. The specimens were kept in either 0.2% NaF or artificial saliva solutions at 37°C for 24 hours (N = 10). The wire load-deflection properties were measured by a Zwick testing machine, using a three-point bending test. An un-paired student’s t-test, a one-way ANOVA and a Tukey post-hoc test were used to assess statistical significance.
Results: Immersion in NaF solution affected the load-deflection properties of NiTi wires. The unloading forces at 0.5 and 1.0 mm deflections were significantly lower in fluoride-treated specimens compared with the control groups (p  0.05).
Conclusions: The results suggested that subjecting NiTi wires to fluoride agents decreased associated unloading forces, especially at lower deflections, and may result in delayed tooth alignment.

Background: It has been demonstrated that fluoride prophylactic agents may cause hydrogen absorption in NiTi wires and degrade their mechanical...

The effect of fluoride exposure on the load-deflection properties of superelastic nickel-titanium-based orthodontic archwires

Published Online: Aug 01, 2023

Page range: 72 - 79

Received: Jan 01, 2011

Accepted: Mar 01, 2012

DOI: https://doi.org/10.2478/aoj-2012-0011

© 2012 Farzaneh Ahrari et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.