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A novel electronic key-controlled expander for precise asymmetric palatal expansion
Nora Alhazmi1,2,3
1Department of Preventive Dental Sciences, College of Dentistry, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia.
Frontiers in Dental Medicine
|January 28, 2026
Summary
A new electronic palatal expander concept offers precise, customizable maxillary expansion. Digital simulations show potential for controlled symmetric and asymmetric movements, improving on conventional devices.
Area of Science:
- Orthodontics
- Biomedical Engineering
- Dental Device Innovation
Background:
- Conventional palatal expanders like the Hyrax present challenges in achieving precise, comfortable, and asymmetric maxillary expansion.
- Manual activation by caregivers can lead to inaccurate screw turns, patient discomfort, and inconsistent outcomes.
- Current devices have limitations in controlled asymmetric expansion, impacting treatment for unilateral crossbites.
Purpose of the Study:
- To introduce a proof-of-concept electronic, key-controlled palatal expander designed for enhanced precision, safety, and ease of use.
- To evaluate the mechanical behavior and expansion potential of this novel device through digital simulation.
- To explore the feasibility of tailored symmetric and asymmetric maxillary expansion.
Main Methods:
- A functional digital simulation using the finite element method (FEM) was employed to assess the device's mechanical behavior.
- The simulation modeled activation of both the central screw for symmetric expansion and lateral keyholes for asymmetric expansion.
- ANSYS 2024 R1 software was utilized for the digital analysis.
Main Results:
- Activation of the center screw demonstrated smooth, stable, and symmetric bilateral expansion (1.08mm lateral displacement per 1mm advancement).
- Selective activation of lateral keyholes showed potential for controlled unilateral movement (1.9mm displacement per 1mm advancement).
- The simulation supports the theoretical feasibility of digitally guided, customizable expansion.
Conclusions:
- The conceptual electronic palatal expander shows promise for precise, controlled, and customizable maxillary expansion, both symmetric and asymmetric.
- This digitally guided approach may reduce reliance on manual activation, potentially improving patient comfort and treatment consistency.
- Further experimental and clinical validation is required to confirm the proposed advantages and clinical utility.
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