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Archwire seating forces produced by different ligation methods and their effect on frictional resistance
Balvinder Khambay1, Declan Millett, Siobhan McHugh
1Unit of Orthodontics, Glasgow Dental School, 378 Sauchiehall Street, Glasgow G2 3JZ, Scotland, UK. bkhambay@yahoo.com
European Journal of Orthodontics
|June 11, 2005
Summary
This study compared orthodontic elastomeric modules and stainless steel ligatures. Stainless steel ligatures showed lower friction, while grey modules had lower seating force but higher friction.
Area of Science:
- Orthodontics
- Biomaterials Science
- Dental Mechanics
Background:
- Orthodontic treatment relies on the interaction between archwires, brackets, and ligation methods.
- Elastomeric modules and stainless steel ligatures are common ligation methods, each with unique mechanical properties.
- Understanding the forces involved in ligation is crucial for optimizing treatment efficiency and patient comfort.
Purpose of the Study:
- To quantify the mean tensile force of four elastomeric modules (purple, grey, Alastik, SuperSlick).
- To measure the archwire seating force of different ligation methods (elastomeric modules and stainless steel ligatures).
- To evaluate the effect of ligation methods on frictional resistance during orthodontic treatment.
Main Methods:
- Tensile force was measured using a Nene M3000 testing machine after extending elastomeric modules by 5 mm.
- Archwire seating force was assessed by measuring the force required to seat stainless steel archwires (0.017x0.025 and 0.019x0.025 inch) into a maxillary premolar bracket using different ligation methods.
- Frictional force was determined using a previously described experimental method for each module and wire size combination.
Main Results:
- Significant differences were found in mean tensile and median archwire seating forces among the tested elastomeric modules.
- Grey modules exhibited the lowest median archwire seating force, while stainless steel ligatures demonstrated the highest.
- Stainless steel ligatures resulted in the lowest mean frictional forces, whereas grey modules showed significantly higher mean frictional force (P < 0.01).
Conclusions:
- Ligation method significantly impacts archwire seating force and frictional resistance in orthodontic treatment.
- While grey modules offer lower seating force, they generate higher friction compared to stainless steel ligatures.
- The force used to seat the archwire does not appear to correlate with the resulting frictional force.