Related Experiment Video
Updated: May 31, 2026
07:32
Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition
Published on: February 23, 2024
Factors Associated With Maxillary Incisor Crown Torque Expression in Non-Extraction Clear Aligner Treatment.
Zixin Miao1,2, Mohan Li3, Henan Zheng4
1Department of Orthodontics, Shenzhen People's Hospital, Shenzhen, Guangdong, China.
Orthodontics & Craniofacial Research
|May 29, 2026
Summary
Clear aligner treatment shows limited maxillary incisor torque expression, averaging 48.1%. Planned torque and vertical skeletal patterns significantly influence this torque expression rate (TER).
Area of Science:
- Orthodontics
- Biomaterials Science
- Dental Technology
Background:
- Accurate torque control is crucial for successful orthodontic treatment.
- Invisalign clear aligners offer an alternative to traditional braces, but their torque expression efficiency requires further investigation.
Purpose of the Study:
- To quantitatively evaluate the accuracy of maxillary incisor torque expression using Invisalign aligners.
- To identify key factors influencing torque expression in non-extraction cases.
Main Methods:
- Retrospective analysis of 50 patients' records treated with Invisalign.
- Measurement of torque values on digital models (pretreatment, staged, and predicted posttreatment) using specialized software.
- Calculation of torque expression rate (TER) and identification of predictors via multiple linear regression.
Main Results:
- Overall maxillary incisor torque expression rate (TER) was 48.1%.
- Achieved torque was significantly less than predicted (mean difference of 4.25°).
- Planned crown torque and vertical skeletal pattern were identified as significant predictors of TER.
Conclusions:
- Maxillary incisor torque expression with clear aligners is limited.
- Planned crown torque and vertical skeletal pattern are critical factors affecting torque expression accuracy.
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