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Frictional resistances using Teflon-coated ligatures with various bracket-archwire combinations
D J De Franco1, R E Spiller, J A von Fraunhofer
1U.S. Army Dental Corps, Fort Knox, Kentucky, USA.
The Angle Orthodontist
|January 1, 1995
Summary
Teflon-coated ligatures significantly reduce friction between orthodontic brackets and archwires. Stainless steel brackets and archwires are recommended for optimal sliding mechanics and tooth movement control.
Area of Science:
- Orthodontics
- Biomaterials Science
- Dental Mechanics
Background:
- Friction between orthodontic brackets and archwires impacts treatment efficiency.
- Ceramic brackets offer esthetics but can increase frictional resistance.
- Ligature type plays a crucial role in modulating friction.
Purpose of the Study:
- To compare static frictional resistances of Teflon-coated ligatures versus elastomeric ligatures.
- To evaluate friction with various bracket and archwire combinations.
- To assess the influence of angulation on frictional forces.
Main Methods:
- Tested stainless steel and ceramic brackets with stainless steel and nickel-titanium archwires.
- Measured friction in a dry state at varying bracket-archwire angulations (0-15 degrees).
- Recorded moments induced by archwire engagement.
Main Results:
- Teflon-coated ligatures consistently showed lower friction than elastomeric ligatures.
- Ceramic brackets generally exhibited higher frictional resistance than stainless steel brackets.
- Stainless steel brackets and archwires demonstrated optimal performance for sliding mechanics.
Conclusions:
- Teflon-coated ligatures effectively minimize friction, especially with ceramic brackets.
- Stainless steel systems are superior for sliding mechanics and tooth movement control.
- Teflon-coated ligatures are valuable for esthetic orthodontic appliances requiring low friction.