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. 2024 Mar 14:21:10.
doi: 10.18502/fid.v21i10.15222. eCollection 2024.

Effect of Elastomeric Module Degradation and Ligation Methods on Kinetic Friction between NiTi or Stainless Steel Wires and Stainless Steel Brackets

Pooya Ebrahimi  1   2 , Parastou Nastarin  2 , Mahdi Hadilou  1 , Behnaz Karimzadeh  1 , Mojgan Kachoei  2
Affiliations

Effect of Elastomeric Module Degradation and Ligation Methods on Kinetic Friction between NiTi or Stainless Steel Wires and Stainless Steel Brackets

Pooya Ebrahimi et al. Front Dent. .

Abstract

Objectives: The reduction of resistance to sliding between the archwire and bracket promotes more seamless tooth movement, leading to a faster and improved orthodontic treatment experience. This research aimed to examine how the degradation of elastomeric modules, different ligation methods, bracket-wire angle, and wire type (nickel titanium, NiTi or stainless-steel, SS) impact the kinetic friction resulting from the interaction between NiTi or SS archwires and SS brackets. Materials and Methods: The current in vitro study was conducted on nine groups, including NiTi and SS archwires with three types of ligations (O-ring, figure of 8, and SS wire ligature) and two bracket-wire angles (0˚ and 10˚). The kinetic friction in each group was measured using a Universal Testing Machine at four time intervals: baseline, day one, week one, and week four. Repeated measures ANOVA, Mauchly test of sphericity followed by the Greenhouse-Geisser test, and relevant post hoc tests were used for statistical analysis (P<0.05). Results: The authors found a decrease in kinetic friction in all types of ligations, which confirmed the effect of time on the degradation of ligation modules. The kinetic friction of figure of 8 ligations was higher than both O-ring and SS wire ligations. No difference was observed between O-ring and SS wire ligations. Furthermore, the bracket-wire angle did not affect friction. Conclusion: The authors suggest that the use of figure of 8 ligations in NiTi and SS wires should be limited due to their high friction and replaced with other types of ligations, if possible.

Keywords: Orthodontic Brackets; Orthodontic Friction; Orthodontic Wires.

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Conflict of interest statement

None declared.

Figures

Fig. 1
Fig. 1
Positioning of brackets on aluminum plates
Fig. 2
Fig. 2
Attachment of the aluminum plate to the base of the Universal testing machine. The aluminum plate was surrounded by MARDON heater
Fig. 3
Fig. 3
The kinetic friction generated in nickel titanium archwire groups at different angles
Fig. 4
Fig. 4
The kinetic friction generated in nickel titanium archwire groups in different ligation methods
Fig. 5
Fig. 5
The kinetic friction generated in Stainless steel archwire groups in different ligation methods
See this image and copyright information in PMC

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