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Frictional forces related to self-ligating brackets

L Pizzoni¹, G Ravnholt, B Melsen

¹School of Orthodontics, University of Milano, Italy.

European Journal of Orthodontics

|August 12, 1998

Summary

Friction in orthodontic tooth movement is reduced with self-ligating brackets compared to conventional ones. Beta-titanium wires generate more friction than stainless steel, and round wires are better than rectangular ones.

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Area of Science:

Biomaterials Science
Orthodontics
Mechanical Engineering

Background:

Orthodontic tooth movement involves teeth sliding along archwires, generating friction that affects force delivery.
Understanding friction is crucial for optimizing orthodontic appliance design and treatment efficiency.

Purpose of the Study:

To evaluate the friction between self-ligating brackets and beta-titanium wires compared to conventional systems.
To determine how wire material, cross-section, and angulation influence friction in orthodontic archwire-bracket interactions.

Main Methods:

A specialized testing machine simulated sliding mechanics using a bracket on an archwire.
Friction was measured for two self-ligating bracket designs against stainless steel and beta-titanium wires (round and rectangular).
Tests were conducted with wires parallel and at an angle to the bracket, with minimal baseline friction subtracted.

Main Results:

Round wires exhibited lower friction than rectangular wires.
Beta-titanium wires demonstrated significantly higher friction than stainless steel wires.
Friction increased with angulation; self-ligating brackets showed lower friction than conventional ones, especially those with conventional capping designs.

Conclusions:

Bracket design, wire material (beta-titanium vs. stainless steel), and wire cross-section (round vs. rectangular) significantly impact frictional forces in orthodontic systems.
Self-ligating brackets offer a notable reduction in friction, with specific designs performing better than others.
Optimizing these components can lead to more controlled and efficient orthodontic force delivery.

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