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Double-Axis Maxillary Skeletal Expander Suggests Higher Expansion Efficiency in Early Activation: A Finite Element
Kaviya Kanokpongsak1, Prajak Jariyapongpaiboon1, Sorapon Na Lampang2
1Dental Department, Rajavithi Hospital, Bangkok, Thailand.
Orthodontics & Craniofacial Research
|July 24, 2025
Summary
A new double-axis maxillary skeletal expander (DAMSE) shows greater efficiency and control in maxillary expansion compared to traditional single-axis devices. Further research is needed to confirm its ability to prevent asymmetric expansion.
Area of Science:
- Orthodontics
- Craniofacial surgery
- Biomedical engineering
Background:
- Conventional single-axis maxillary skeletal expanders (MSE) present challenges in controlling maxillary expansion and may lead to asymmetric outcomes.
- The double-axis maxillary skeletal expander (DAMSE) concept is proposed to address these limitations and improve treatment efficiency.
Purpose of the Study:
- To evaluate the expansion efficiency and stress distribution of five double-axis maxillary skeletal expander (DAMSE) designs.
- To compare the performance of DAMSE designs against conventional single-axis MSE using finite element analysis.
Main Methods:
- Finite element analysis was employed to simulate and compare the biomechanical performance of different DAMSE designs and a single-axis MSE.
- A simplified bone model was utilized to analyze expansion efficiency, stress magnitude, and distribution.
Main Results:
- DAMSE designs demonstrated superior control over maxillary expansion, particularly at the anterior nasal spine (ANS) and posterior nasal spine (PNS), compared to single-axis MSE.
- DAMSE Model V achieved the highest expansion efficiency (31.7%) in early activation, exceeding the single-axis MSE by 13%.
- Combining DAMSE Model V with midpalatal suture surgery further enhanced efficiency to 100.8%, though asymmetric expansion between ANS and PNS was not definitively resolved in the simplified model.
Conclusions:
- Well-designed DAMSE devices represent a promising advancement for maxillary expansion therapy.
- DAMSE offers potentially more efficient maxillary expansion treatment compared to conventional single-axis MSE, with comparable patient comfort and invasiveness.
