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Updated: Jun 12, 2026
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Finite Element Analysis Model for Assessing Expansion Patterns from Surgically Assisted Rapid Palatal Expansion
Published on: October 20, 2023
Spring expansion is influenced by cranial biomechanics
Charles Davis1, Per Windh, Claes G K Lauritzen
1Central & Southern New Zealand Craniofacial Program, Wellington, New Zealand. info@craniofacialsurgery.co.nz
The Journal of Craniofacial Surgery
|May 21, 2010
Summary
Spring cranioplasty in rabbits shows cranial biomechanics alter expansion rates. Springs retain significant force after use, potentially preventing relapse if removed prematurely.
Area of Science:
- Craniofacial surgery
- Biomechanical engineering
- Pediatric neurosurgery
Background:
- Spring cranioplasty is a surgical technique for craniosynostosis.
- A rabbit model is utilized to investigate biomechanical properties of spring expansion.
Purpose of the Study:
- To determine if cranial biomechanics affect spring expansion rates.
- To assess residual spring force after cranial expansion in vivo.
- To evaluate spring weakening during clinical application.
Main Methods:
- Posterior frontal suturectomy and spring expansion were performed on 15 rabbits.
- Control and sham groups underwent suturectomy or incision only.
- Cephalography and force-deflection curves measured expansion and spring force.
Main Results:
- Significant cranial expansion occurred within the first 8 hours.
- Expansion rates varied, with periods of rapid and decreased expansion.
- Springs retained 40% of original force at 90% expansion, and 28% at completion.
Conclusions:
- Craniofacial structures influence spring expansion dynamics.
- Substantial spring force remains post-expansion, suggesting relapse risk if removed early.
- Springs maintained consistent load-compression curves, indicating durability.
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