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Mechanical analysis of factors affecting clear aligner removability
Yurie Takara1, Shugo Haga1, Hitoshi Kimura2
1Department of Orthodontics, School of Dentistry, Showa University.
Dental Materials Journal
|March 24, 2022
Summary
Clear aligner grip on teeth is crucial for effective orthodontic treatment. This study found that aligner attachment shape, location, and removal site significantly impact gripping force, with the weakest grip on molars and strongest on incisors.
Area of Science:
- Orthodontics
- Biomaterials Science
- Dental Mechanics
Background:
- Controlling corrective forces in clear aligner orthodontics is challenging.
- Accurate force delivery relies on the aligner's grip on teeth.
- Understanding factors influencing aligner grip is essential for treatment efficacy.
Purpose of the Study:
- To measure the gripping force of clear aligners under varying conditions.
- To identify factors influencing aligner gripping force.
- To optimize aligner design for improved force control.
Main Methods:
- Developed a novel device to measure aligner removal mechanics.
- Fabricated clear aligners with diverse attachment morphologies and placement sites.
- Varied aligner margin lengths to assess their impact.
- Evaluated gripping force at five distinct tooth removal sites.
Main Results:
- Aligner gripping force varied significantly based on attachment morphology and placement.
- The weakest gripping force was observed on the lingual side of first molars.
- The strongest gripping force was recorded on the labial side of central incisors.
Conclusions:
- Attachment morphology and placement are critical determinants of clear aligner gripping force.
- Knowledge of gripping force variations can inform improved aligner design and application.
- Optimizing aligner grip is key to enhancing the precision of orthodontic force delivery.
