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The study aims to predict and compare how different auxiliaries affect the torque expression of maxillary central incisors when using clear aligners.

Prediction Of Torque Expression Of Upper Central Incisor Using Different Auxiliaries In Clear Aligners - A FEM Study

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The study aims to predict and compare how different auxiliaries affect the torque expression of maxillary central incisors when using clear aligners.
Constructed a three-dimensional FEM model from CBCT and intraoral scan data of a patient with normal occlusion.
Analyzed three models: aligner without attachment, aligner with vertical rectangular attachment, and aligner with power ridge.
Applied a palatal force of 1.89 N to simulate incisor torque and evaluated displacement patterns and stress distribution.
Vertical displacement was minimal and clinically insignificant for all models.
Power ridge model showed the greatest palatal displacement, indicating superior torque expression.
Peak PDL stress was highest in the power ridge model (19.62 MPa), moderate with rectangular attachments (14.67 MPa), and lowest without attachments (13.48 MPa).

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Finite element method study predicts torque expression in maxillary incisors, suggesting power ridges improve outcomes.

Savio et al. (2026) studied this question.

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