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The silver sorption layer in dental composites: three year results
1Department of Clinical Dental Sciences, University of Liverpool, UK. l.h.mair@liv.ac.uk
Summary
Dental composites showed increasing silver stain depth over three years, indicating Case 1 (Fickian) diffusion. Differences in stain depth suggest variations in polymer chain mobility and free space within the resin composites.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Dental Materials
Background:
- Dental composites are widely used restorative materials.
- Understanding their long-term behavior and interaction with oral fluids is crucial.
- Silver sorption layers have been recently observed in dental composites.
Purpose of the Study:
- To investigate the behavior of silver sorption layers in seven dental composites over a three-year period.
- To quantify the depth of silver penetration in different composite materials.
Main Methods:
- Seven resin composites were fabricated into testpieces.
- Testpieces were immersed in aqueous silver nitrate (AgNO3).
- Silver stain depth was measured at multiple time points up to 1085 days.
Main Results:
- Silver stain depth increased over time, following a rate proportional to (time)0.5.
- Significant differences in stain depth were observed among the seven composites after three years.
- The resin-rich surface generally showed greater stain depth than the ground surface.
Conclusions:
- The sorption mechanism is consistent with Case 1 (Fickian) diffusion.
- Variations in stain depth suggest differences in polymer chain mobility and free space within the composites.
- The silver sorption layer may indicate the extent of water penetration into the dental composites.