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Nickel titanium T-loop wire dimensions for en masse retraction.

Layene Almeida1, Alexandre Ribeiro2, Renato Parsekian Martins3

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|January 14, 2016
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Summary

Nickel-titanium T-loop springs with larger wire dimensions generate greater forces. However, the 0.016" × 0.022" wire produced the highest moment-to-force ratio, indicating optimal force delivery for orthodontic applications.

Keywords:
NiTiOrthodonticsT-loop

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Area of Science:

  • Orthodontics
  • Biomaterials Science
  • Mechanical Engineering

Background:

  • Nickel-titanium (NiTi) T-loop springs are crucial in orthodontics for controlled tooth movement.
  • Optimizing the force system of NiTi springs is essential for efficient and predictable treatment outcomes.
  • Wire dimensions significantly influence the mechanical properties and force delivery of orthodontic springs.

Purpose of the Study:

  • To compare the force system generated by nickel-titanium T-loop springs fabricated with varying wire dimensions.
  • To evaluate the impact of different wire sizes on force, moment, and moment-to-force ratios.

Main Methods:

  • Thirty NiTi T-loop springs were categorized into three groups based on wire dimensions: 0.016" × 0.022", 0.017" × 0.025", and 0.018" × 0.025".
  • Springs were tested using an Orthodontic Force Tester at a 23 mm interbracket distance and 9 mm activation.
  • Force (y-axis), moment (x-axis), and moment-to-force (M/F) ratios were recorded during deactivation.

Main Results:

  • All groups exhibited statistically significant differences in forces (P < .001).
  • The 0.016" × 0.022" wire produced 1.78N force, while larger wires (0.017" × 0.025" and 0.018" × 0.025") generated higher forces (2.81 N and 3.25 N, respectively).
  • The 0.016" × 0.022" T-loops yielded the highest M/F ratio (6.7 mm), compared to 5.0 mm and 4.5 mm for the larger wire dimensions.

Conclusions:

  • Larger wire dimensions in NiTi T-loop springs result in increased forces and slightly higher moments.
  • The 0.016" × 0.022" wire dimension demonstrated the most favorable moment-to-force ratio, suggesting superior force control.
  • Wire dimension is a critical factor in tailoring the force system of NiTi T-loop springs for specific orthodontic needs.