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Dental composites based on amorphous calcium phosphate - resin composition/physicochemical properties study.
1Paffenbarger Research Center, American Dental Association Foundation, National Institute of Standards and Technology Gaithersburg, MD 20899, USA. drago.skrtic@nist. gov
Journal of Biomaterials Applications
|May 11, 2006
Summary
Resin composition impacts composite properties. Hydrophobic monomers reduce water sorption, while HEMA-containing resins enhance mineral release for potential apatite re-deposition.
Area of Science:
- Materials Science
- Polymer Chemistry
- Biomaterials Engineering
Background:
- Understanding resin composition effects is crucial for developing advanced dental composites.
- Amorphous calcium phosphate (ACP) is a promising filler for remineralizing dental materials.
Purpose of the Study:
- To investigate how different resin matrix compositions influence the physicochemical properties of ACP-filled composites.
- To evaluate the impact of diluent monomers like hexamethylene dimethacrylate (HmDMA) and 2-hydroxyethyl methacrylate (HEMA) on composite performance.
Main Methods:
- Formulation of photo-polymerizable binary and ternary resin matrices with varying monomers.
- Incorporation of 40% zirconia-hybridized ACP into the resin matrices.
- Evaluation of key properties: biaxial flexure strength (BFS), degree of conversion (DC), polymerization shrinkage (PS), water sorption (WS), and mineral ion release (Ca, PO4).
Main Results:
- High degrees of conversion (DC) were achieved (82-94% for copolymers, 74-91% for composites).
- Water sorption (WS) was significantly reduced by hydrophobic HmDMA inclusion.
- Calcium and phosphate release levels exceeded those required for apatite re-deposition, particularly in HEMA-containing formulations.
Conclusions:
- Resin formulation significantly affects composite properties like water sorption and ion release.
- Hydrophobic monomers are beneficial for reducing water uptake.
- While ion release is promising for remineralization, further optimization is needed to improve polymerization shrinkage and mechanical strength, potentially addressing ACP dispersion issues.