Leveraging the Concentration-Gradient Diffusion within a Catalyst-Containing Hydrogel Bilayer Enables Safe and...

Area of Science:

• Biomaterials Science
• Nanotechnology
• Oral Health

Background:

• Tooth whitening and caries prevention are crucial for oral health.
• Chemodynamic therapy (CDT) uses nanocatalysts to generate reactive oxygen species (ROS) for dental applications.
• Controlling ROS generation in CDT is challenging, risking tissue damage or reduced efficacy.

Purpose of the Study:

• To develop a controlled method for ROS generation in tooth whitening and caries prevention.
• To design a hydrogel bilayer system for precise regulation of CDT.
• To investigate concentration-gradient diffusion for modulating ROS production.

Main Methods:

• Fabrication of a hydrogel bilayer encapsulating hydrogen peroxide (H2O2) and iron-based metal-organic frameworks (Fe-MOFs) nanoparticles.
• Utilizing concentration-gradient diffusion of H2O2 to control ROS generation.
• Employing Monte Carlo simulations and machine learning to derive mathematical formulas for reaction control.

Main Results:

• The bilayer system successfully regulated ROS generation, avoiding initial bursts and controlling duration.
• Mathematical formulas enabled near-independent modulation of reaction half-life and rate.
• Achieved safe and effective tooth whitening and caries prevention through controlled ROS release.

Conclusions:

• The hydrogel bilayer design offers precise control over CDT for dental applications.
• Concentration-gradient diffusion is a viable strategy for managing ROS generation.
• This approach holds promise for extending to other CDT systems requiring controlled therapeutic outcomes.