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Characterization of riboflavin-modified dentin collagen matrix
A Fawzy1, L Nitisusanta, K Iqbal
1Discipline of Oral Sciences, Faculty of Dentistry, National University of Singapore, 11 Lower Kent Ridge Road, Singapore, 119083, Singapore. denasfmf@nus.edu.sg
Journal of Dental Research
|August 24, 2012
Summary
UVA-activated riboflavin enhances dentin collagen matrix stability and resistance to degradation. Higher concentrations (1%) offer more efficient crosslinking within a clinically relevant timeframe.
Area of Science:
- Biomaterials Science
- Dental Materials
- Biochemistry
Background:
- Dentin collagen matrix stability is crucial for dental tissue integrity.
- Crosslinking agents are explored to improve mechanical and structural properties.
- Biodegradation resistance is a key challenge in dentin biomaterial applications.
Purpose of the Study:
- To investigate mechanical and chemical changes in dentin collagen matrix crosslinked with UVA-activated riboflavin.
- To assess the impact of riboflavin crosslinking on collagen degradation resistance.
- To evaluate the efficiency of different riboflavin concentrations and UVA activation.
Main Methods:
- Dentin specimens treated with 0.1% and 1% riboflavin, followed by UVA (368 nm) photo-activation.
- Structural analysis using Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM).
- Mechanical properties assessed via nano-indentation and conventional testing; biodegradation resistance evaluated by hydroxyproline liberation; chemical changes analyzed by micro-Raman spectroscopy.
Main Results:
- UVA-activated riboflavin significantly improved mechanical properties, stability, and biodegradation resistance of the dentin collagen matrix.
- Crosslinking enhanced collagen network structural resistance against collagenolytic enzymes.
- Micro-Raman spectroscopy confirmed collagen/riboflavin interactions, showing dependency in specific Raman bands.
- 1% riboflavin demonstrated more efficient crosslinking within a clinically acceptable timeframe compared to 0.1%.
Conclusions:
- UVA-activated riboflavin is an effective crosslinking agent for enhancing dentin collagen matrix properties.
- Crosslinking improves mechanical integrity and resistance to enzymatic degradation.
- Optimized riboflavin concentration and activation protocols can yield clinically relevant improvements in dentin biomaterials.
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