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[The relationship of wire offset and lingual component force on first molar]
Ding Zhang1, Ruo-fang Zhang, Li Chen
1Department of Ortholontics, Peking University School of Stomatology, Beijing 100081, China.
Summary
Retracting canines generates lingual force on molars. Larger arch wires and wider molar offsets reduce this force, aiding anchorage during orthodontic treatment.
Area of Science:
- Orthodontic mechanics
- Biomechanical analysis
- Dental anchorage
Context:
- Canine retraction is a common orthodontic procedure.
- Lingual forces on molars can compromise anchorage.
- Arch wire properties and molar offset influence force distribution.
Purpose:
- To quantify the lingual force on the first molar during canine retraction.
- To evaluate the effect of different arch wire sizes and molar offset widths on this force.
Summary:
- A 150g tractive force during canine retraction produced a measurable lingual force on the first molar.
- Increased arch wire cross-sectional area and rigidity reduced lingual force.
- Increasing molar offset width linearly decreased the lingual force on the molar.
Impact:
- Findings suggest strategies to minimize unwanted molar movement during canine retraction.
- Clinicians can optimize arch wire selection and molar offset for better anchorage control.
- This research contributes to understanding force dynamics in orthodontic mechanics.