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Dentin caries zones: mineral, structure, and properties
M K Pugach1, J Strother, C L Darling
1Department of Preventive and Restorative Dental Sciences, University of California, 707 Parnassus Ave. Box 0758, Dentistry 2246, San Francisco, CA 94143-0758, USA.
Journal of Dental Research
|January 10, 2009
Summary
Caries Detector staining identifies distinct dentin zones. Physical and microstructural properties, including mineral content, significantly decrease across these zones, offering insights into carious dentin.
Area of Science:
- Dental research
- Materials science
- Biomaterials
Background:
- Caries Detector staining delineates four zones in carious dentin.
- The physical and microstructural characteristics of these zones are not fully understood.
Purpose of the Study:
- To investigate the physical and microstructural properties of carious dentin across four zones identified by Caries Detector staining.
- To determine the differences in these properties revealed by the staining.
Main Methods:
- Six arrested dentin caries lesions and two normal controls were stained.
- Atomic force microscopy (AFM) imaging and nano-indentation were used for microstructure and mechanical property analysis.
- Transverse digital microradiography (TMR) assessed mineral content.
Main Results:
- Significant decreases in microstructure, nanomechanical properties, and mineral content were observed across the stained zones.
- Hydrated elastic modulus decreased from 19.5 GPa in normal dentin to 1.6 GPa in the pink zone.
- Mineral content decreased from 42.9 vol% in normal dentin to 12.4 vol% in the pink zone.
Conclusions:
- Caries Detector staining effectively differentiates zones with varying physical and microstructural properties in carious dentin.
- Despite extensive demineralization, the pink zone retains some mineral content.
- These findings enhance the understanding of carious dentin characterization.
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