Related Experiment Video
Updated: May 23, 2026
07:16
Finite Element Analysis Model for Assessing Expansion Patterns from Surgically Assisted Rapid Palatal Expansion
Published on: October 20, 2023
Comparison of five different fixation techniques of sagittal split ramus osteotomy using three-dimensional finite
F R L Sato1, L Asprino, P Y Noritomi
1Department of Oral and Maxillofacial Surgery, Piracicaba Dental School, State University of Campinas (Unicamp), Brazil. fabio.sato@fop.unicamp.br
International Journal of Oral and Maxillofacial Surgery
|April 19, 2012
Summary
The inverted L screw arrangement for sagittal split ramus osteotomy (SSRO) fixation showed the lowest mechanical stress on bone and hardware. Locking miniplates also offered better stress distribution than conventional systems in finite element analysis.
Area of Science:
- Oral and Maxillofacial Surgery
- Biomechanical Engineering
- Dental Implantology
Background:
- Sagittal split ramus osteotomy (SSRO) is a common procedure in orthognathic surgery.
- Effective fixation is crucial to ensure stability and minimize complications.
- Understanding biomechanical stress distribution is key to optimizing fixation techniques.
Purpose of the Study:
- To compare mechanical stress in the hemimandible and fixation hardware across five different SSRO fixation methods.
- To evaluate the biomechanical performance of various screw and miniplate configurations.
- To identify fixation techniques that minimize stress concentration.
Main Methods:
- A three-dimensional (3D) finite element analysis (FEA) model of a hemimandible was developed.
- A 5mm advancement SSRO was simulated computationally.
- Five fixation techniques were modeled: 3 linear 60° screws, 3 linear 90° screws, 3 inverted L screws, 1 conventional miniplate, and 1 locking miniplate.
Main Results:
- The inverted L screw arrangement exhibited the lowest maximum principal stress in both bone and fixation hardware.
- Linear screw arrangements (90° and 60°) showed intermediate stress levels.
- The locking miniplate system demonstrated lower maximum principal stress and superior stress distribution compared to the conventional miniplate.
Conclusions:
- The reversed L screw arrangement offers the most favorable stress dissipation for SSRO.
- Locking plates provide biomechanical advantages over conventional plates for SSRO fixation.
- FEA is a valuable tool for assessing and comparing SSRO fixation strategies.
