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Accuracy of Preliminary Maxillary Canine and Anchorage Tooth Movement in Premolar Extraction Cases Using 12 In-House
Natnicha Vongtiang1, Nathaset Tongkitcharoen2, Sawitt Eurutairat1
1Faculty of Dentistry, Mahidol University, Bangkok, Thailand.
Orthodontics & Craniofacial Research
|December 28, 2024
Summary
In-house clear aligners with palatal power arms showed accuracy differences in canine distalization and tipping compared to controls. While showing potential for less rotation, they may increase tipping errors during orthodontic space closure.
Area of Science:
- Orthodontics and Dentofacial Orthopedics
- Biomaterials and Dental Devices
- Digital Dentistry and Imaging
Background:
- Maxillary canine retraction is crucial for space closure in orthodontic treatment.
- In-house clear aligners (IHCAs) offer a customizable approach to orthodontic tooth movement.
- Assessing the accuracy of IHCAs, particularly with auxiliary features like power arms, is essential for predictable outcomes.
Purpose of the Study:
- To evaluate the accuracy of maxillary canine movement and anchorage during space closure using IHCAs.
- To compare the efficacy of a palatal power arm (Pa) versus a non-power arm control (C) in canine retraction.
- To assess tipping, rotation, and translation errors associated with IHCA use in first premolar extraction cases.
Main Methods:
- A split-mouth randomized controlled trial involving 16 adult participants was conducted.
- Canine retraction was performed using 12 IHCAs, with one side featuring a palatal power arm (Pa) and the other serving as a control (C).
- Accuracy was quantified by comparing virtual and actual digital models using GOM Inspect software, calculating Root Mean Square Error (RMSE).
Main Results:
- The palatal power arm (Pa) group showed a significant difference in preliminary canine distalization (2.0 mm virtual vs. 2.4 mm actual).
- Both Pa and control groups exhibited greater actual distal crown tipping than virtual movement, with Pa showing slightly higher RMSE for tipping.
- The Pa group demonstrated better accuracy in canine rotation, while anchorage mesialization and tipping showed comparable RMSE between groups.
Conclusions:
- Preliminary canine retraction with palatal power arms in IHCAs may lead to increased distal crown tipping errors but reduced rotational errors compared to controls.
- Further investigation is warranted to optimize IHCA designs for precise control of canine movement and anchorage during orthodontic space closure.
