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Updated: Aug 25, 2026
Finite Element Analysis Model for Assessing Expansion Patterns from Surgically Assisted Rapid Palatal Expansion
Published on: October 20, 2023
[Study on the changes of TMJ stress before and after sagittal split ramus osteotomy by 3D finite element method]
Bing Fang1, Qi Zhou, Guo-fang Shen
1Joint Orthodontics-Orthognathics Center, Ninth People's Hospital, School of Stomatology, Shanghai Second Medical University, Shanghai 200011, China. judy63fb@yahoo.com
Purpose:
To investigate the characteristic changes of the TMJ stress distributions, before and after SSRO for treating the skeletal class III malocclusion, being during centric occlusion.
Methods:
CT scan was used to obtain 2-D transverse image of maxilla and mandible. Finite element models were established before and after SSRO. An analysis of the stress, strain, and displacement of TMJ configurations was done by three-finite element method. Paired t test was used to compare the stress before and after operation.
Results:
The Von Mises stress on TMJ configurations was found to decrease significantly after mandibular set-back SSRO; The maximal and minimal principal stress and maximal displacement were also found to decrease after surgery; The stress of both sides of the TMJ was found to distribute symmetrically.
Conclusion:
Oral and maxillofacial deformity was treated by orthognathics surgery, jaws were repositional that induce the changes of the TMJ stress, the upper and lower further study should be done to determine the stress changes effecting the function and health of TMJ.
