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Effects of variable attachment shapes and aligner material on aligner retention
Hiltrud Dasy1, Andreas Dasy1, Greg Asatrian2
1a Postgraduate Student, Section of Orthodontics, School of Dentistry, University of California, Los Angeles, Calif.
The Angle Orthodontist
|October 31, 2015
Summary
Beveled attachments significantly enhance the retention of clear aligners, unlike ellipsoid attachments. Different clear aligner (CA) types and Essix ACE show varied retention, with beveled attachments improving overall aligner stability.
Area of Science:
- Dental materials science
- Orthodontic technology
Background:
- Clear aligners are widely used in orthodontics.
- Aligner retention is crucial for effective treatment.
- Dental arch attachments can influence aligner fit and retention.
Purpose of the Study:
- To evaluate the retention of four types of clear aligners on dental casts with different attachments.
- To compare the removal forces of various aligners with and without attachments.
Main Methods:
- Four thermoformed aligner types were tested: Clear-Aligner (CA)-soft, CA-medium, CA-hard, and Essix ACE.
- Dental casts included ellipsoid attachments, beveled attachments, or no attachments (control).
- Vertical displacement force during aligner removal was measured using a Gabo Qualimeter Eplexor.
Main Results:
- Clear-Aligner (CA) types showed increased retention only with attachments.
- CA-medium and CA-hard required significantly higher removal forces.
- Essix ACE retention decreased with ellipsoid attachments but improved with beveled attachments.
- Beveled attachments significantly enhanced aligner retention compared to no attachments or ellipsoid attachments.
Conclusions:
- Beveled attachments significantly improve clear aligner retention.
- Ellipsoid attachments have a negligible effect on aligner retention.
- Essix ACE shows reduced retention with attachments compared to CA-hard.
- Aligner type and attachment design are critical factors for optimal retention.
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