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Updated: May 8, 2026

Finite Element Analysis Model for Assessing Expansion Patterns from Surgically Assisted Rapid Palatal Expansion
Published on: October 20, 2023
[The impact of Forsus on mandible's stress and displacement]
Lihua Li1, Xiang Gao, Jinlin Song
1Dept. of Stomatology, Affiliated Hospital of North Sichuan Medical College, Nanchong 637000, China.
Objective:
To further explore the best Forsus load power by analyzing the change of mandible's stress and displacement after Forsus protruded mandible instantaneously under different vertical component for providing theoretical basis.
Methods:
The pre-built Forsus protruding mandible model were build through Abaqus 6.5 software. The change of mandible's stress, displacement, and pathway trend under three different working conditions(horizontal component 4 N and vertical component 2, 4, 1 N).
Results:
Torsion occurred in all condyles under three working conditions, and the stress was large. Under vertical component 2 and 1 N, the mandible demonstrated counterclockwise rotation, the maximum displacement occurred in the chin, respectively 1.150 mm and 2.141 mm; under vertical component 4 N, mandible rotation was not obvious, the maximum displacement of chin was only 0.188 mm.
Conclusion:
With the vertical component gradually decreased, the protrusion trend of chin increased; Forsus could promote the mandible counterclockwise rotation and modification when protruding mandible.
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