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Mineral distribution and dimensional changes in human dentin during demineralization
J H Kinney1, M Balooch, D L Haupt
1Chemistry and Materials Science Department, Lawrence Livermore National Laboratory, California 94551, USA.
Journal of Dental Research
|May 1, 1995
Summary
Acid etching dentin for bonding causes minor surface shrinkage but creates a porous layer. A partially demineralized zone beneath the surface influences bonding agent penetration and stability.
Area of Science:
- Biomaterials Science
- Dental Materials
- Surface Chemistry
Background:
- Dental bonding agents often rely on acid etching to prepare the dentin surface.
- Understanding the stability and morphology of etched dentin is crucial for enhancing bond strength and reliability.
Purpose of the Study:
- To quantify dimensional changes in hydrated dentin during acid etching.
- To analyze the mineral density distribution and morphology of the etched dentin surface.
Main Methods:
- Utilized atomic force microscopy (AFM) to measure dimensional changes.
- Employed X-ray tomographic microscopy (micro-CT) to assess mineral density distribution.
- Demineralization was performed using a pH 4.0 lactic acid gel.
Main Results:
- Intertubular dentin showed minimal shrinkage (<0.5 microns).
- Peritubular dentin receded rapidly, increasing surface porosity.
- Three subsurface zones were identified: fully demineralized, partially demineralized, and normal dentin.
Conclusions:
- Etched dentin surfaces exhibit controlled porosity and subsurface demineralization zones.
- Differential transport rates in peritubular and intertubular dentin likely explain the observed demineralization patterns.
- Findings provide insights into the behavior of etched dentin for improved dental adhesive systems.