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Wire load-deflection characteristics relative to different types of brackets
Luca Lombardo1, Angela Arreghini, Kholoud Al Ardha
1Department of Orthodontics, University of Ferrara, Via Montebello, 31, Ferrara 44100, Italy. lulombardo@tiscali.it
International Orthodontics
|February 5, 2011
Summary
Bracket dimensions significantly impact tooth forces in orthodontics. For lingual treatment, superelastic wires are essential due to shorter arch lengths and reduced interbracket distances, unlike traditional labial mechanics.
Area of Science:
- Orthodontics
- Biomaterials Science
- Dental Mechanics
Background:
- Bracket dimensions are crucial in determining forces exerted on teeth during orthodontic treatment.
- Traditional labial orthodontic wires may not be suitable for lingual orthodontics due to differing arch dimensions.
Purpose of the Study:
- To investigate the influence of bracket dimensions on tooth forces in both labial and lingual orthodontics.
- To evaluate the suitability of common labial orthodontic wires for the initial phase of lingual treatment.
Main Methods:
- Eight different bracket types were used on an ideal dental cast.
- Interbracket distance was measured using ImageJ software.
- Theoretical wire load was mathematically calculated at various deflection levels for different bracket types and wire alloys.
Main Results:
- Lingual anterior arch length is consistently shorter than the vestibular arch.
- Bracket dimensions influence interbracket distance and consequently the wire load on teeth.
- Superelastic Nickel-Titanium (NiTi) wires provide light, continuous forces at large deflections, lower than other alloys.
Conclusions:
- The hypothesis that bracket dimensions affect tooth forces was supported.
- Superelastic wires with smaller diameters are necessary for lingual mechanics, especially in early treatment phases, due to reduced interbracket distances.
- Smaller mesiodistal bracket dimensions can help minimize tooth loading.
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