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Robust Ligature-Induced Model of Murine Periodontitis for the Evaluation of Oral Neutrophils

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Conventionally ligated versus self-ligating metal brackets--a comparative study.

C A Reicheneder¹, T Gedrange, S Berrisch

¹Department of Orthodontics, Regensburg University Medical Center, Germany. claudia.reicheneder@gmx.net

European Journal of Orthodontics

|November 26, 2008

Summary

This study found that self-ligating brackets with 0.018 x 0.025 inch wires had significantly lower friction. Choosing the right bracket and wire combination is key for optimal orthodontic treatment outcomes.

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Area of Science:

Orthodontics
Biomaterials Science
Dental Mechanics

Background:

Frictional forces in orthodontic treatment influence treatment duration and efficiency.
Self-ligating brackets and conventionally ligated brackets differ in their mechanics.
Optimizing bracket-wire interactions is crucial for predictable orthodontic outcomes.

Purpose of the Study:

To compare the frictional forces between four types of self-ligating metal brackets and three types of conventionally ligated metal brackets.
To evaluate the effect of different stainless steel archwire dimensions on bracket friction.
To determine the optimal bracket-wire combination for minimizing friction in orthodontic treatment.

Main Methods:

Frictional forces were measured using a Zwick testing machine for seven different metal bracket systems (Speed, Damon 2, In-Ovation, Time, Victory Twin, Discovery).
Stainless steel wires of dimensions 0.017 x 0.025, 0.018 x 0.025, and 0.019 x 0.025 inches were tested with 0.022 inch slot brackets.
Statistical analysis included the Mann-Whitney U-test and Games-Howell post hoc test to compare bracket/wire combinations.

Main Results:

The 0.018 x 0.025 inch wire dimension generally resulted in the lowest frictional forces across most bracket types.
Self-ligating brackets exhibited 45-48% lower friction with 0.018 x 0.025 inch wires compared to other wire dimensions.
Conventionally ligated brackets showed less significant friction reduction (≤14%) with the 0.018 x 0.025 inch wire.

Conclusions:

Self-ligating brackets demonstrate superior frictional reduction with 0.018 x 0.025 inch wires compared to conventionally ligated brackets.
Conversely, conventionally ligated brackets showed lower friction with 0.017 x 0.025 and 0.019 x 0.025 inch wires.
The selection of an appropriate bracket system and archwire dimension is critical for minimizing frictional forces and optimizing orthodontic treatment efficiency.