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Functional MgAl LDH@SiO₂ Composites: Controlled Fluoride Delivery in Dentistry.

Asma Alazreg¹, Marija M Vuksanović², Vladisav Tadić³

¹Faculty of Technology and Metallurgy, University of Belgrade, 11000 Belgrade, Serbia.

Molecules (Basel, Switzerland)

|June 26, 2026

Summary

Rice husk bio-silica particles coated with MgAl layered double hydroxides (LDHs) and converted to oxides (LDOs) show potential for fluoride delivery. Embedding these particles in acrylic matrices enables sustained fluoride release for dental applications.

Keywords:

composite materials fluoride release layered double hydroxide silica particles

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Area of Science:

Materials Science
Nanotechnology
Biomaterials

Background:

Bio-silica particles from rice husks offer a sustainable platform.
Layered double hydroxides (LDHs) are known for anion exchange properties.
Controlled fluoride release is crucial for dental applications.

Purpose of the Study:

To develop and evaluate MgAl-LDH/LDO coated bio-silica particles for fluoride capture and release.
To investigate the influence of solvent media on fluoride uptake.
To assess the sustained release of fluoride from composite materials for dental use.

Main Methods:

Coating rice husk bio-silica with MgAl-LDH.
Thermal conversion of LDH to layered double oxides (LDOs).
Fluoride loading in aqueous and ethanol-water mixtures.
Fluoride release studies in demineralized water and acrylic matrices.

Main Results:

Mixed solvents (ethanol-water) enhanced fluoride uptake.
Rapid fluoride release in demineralized water (~1500 min).
Embedding in acrylic matrix reduced release rate significantly, enabling sustained release.
Ethanol promoted ion exchange and memory effects for tunable fluoride control.

Conclusions:

MgAl-LDH/LDO coated bio-silica composites show promise for controlled fluoride delivery.
These materials can act as adaptive fillers in dental restorative materials.
Tunable fluoride release characteristics are achievable for enhanced dental applications.