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Journal of Composite Materials
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Illuminating the Role of Agglomerates on Critical Physicochemical Properties of Amorphous Calcium Phosphate Composites

J.N.R. O'Donnell

Paffenbarger Research Center, American Dental Association Foundation, justin.odonnell{at}nist.gov

J.M. Antonucci

Polymers Division, National Institute of Standards and Technology 100 Bureau Drive Stop 8546, Gaithersburg, MD 20899, USA

D. Skrtic

Paffenbarger Research Center, American Dental Association Foundation

Water sorption (WS), mechanical strength, and ion release of polymeric composites formulated with 40% as-made or milled amorphous calcium phosphate (ACP) are compared after 1, 2 and 3 months of aqueous exposure. Ethoxylated bisphenol A dimethacrylate, triethylene glycol dimethacrylate, 2-hydroxyethyl methacrylate, and methacryloxyethyl phthalate comprised the resin. The WS (mass%) peaked at 3 months. WS of as-made ACP composites was significantly higher than WS of milled ACP composites and copolymers. Both composite groups experienced decreases in biaxial flexural strength (BFS) with water aging, with milled ACP composites retaining a significantly higher BFS throughout immersion. Ion release was moderately reduced in milled ACP composites, though they remained superior to as-made ACP composites due to significantly lower WS and higher BFS after prolonged aqueous exposure.

Key Words: amorphous calcium phosphate • biaxial flexure strength • ion release kinetics • particle size distribution • water sorption.

Journal of Composite Materials, Vol. 42, No. 21, 2231-2246 (2008)
DOI: 10.1177/0021998308094797
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